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21 Aug, 2019
By, Wikipedia

CA-04

California's 4th congressional district is a U.S. congressional district in California. The district is located in the northwestern part of the state, and includes all of Lake County and Napa County, most of Yolo County, and parts of Solano County and Sonoma County. Major cities in the district include Davis, Woodland, Napa, Vacaville, and most of Santa Rosa. The new 4th district is solidly Democratic, and is represented by Mike Thompson.

From 2013 to 2023, the district encompassed the Sierras from Truckee to the Sequoia National Forest, as well as a largely suburban area on the edge of the Sacramento Valley in southwestern Placer County. It consisted of Alpine, Amador, Calaveras, El Dorado, Mariposa, and Tuolumne counties plus most of Placer County and portions of Fresno, Madera, and Nevada counties. The district was represented by Republican Tom McClintock.

Competitiveness

In 2006, Republicans had 48 percent of voter registrations, Democrats had 30 percent, and Libertarians had roughly 5 percent. A Democratic congressional candidate nearly won the district in 2008, losing by only half a percentage point and less than 1,600 votes, indicating that the district was much more competitive than it appeared to be.

New district boundaries for the 2012 elections shifted the population center to the south and east. Registered Democrats and Independents/Decline to State voters in the new district area outnumber registered Republicans by 12%. However, Republicans, Independents/Decline to State, and small third parties outnumber Democrats well over a 2 to 1 ratio. There were 183,800 Republicans, 117,300 Democrats, and 97,200 others. In presidential elections, Donald Trump won the district in 2016 with 54% of the vote and won in 2020 with 53.7% of the vote. In the 2018 and 2020 elections, the Republican candidate won over 53% of the vote.

In the 2020 redistricting, the district was shifted again to the San Francisco Bay Area. It includes all of Lake County and Napa County, most of Yolo County, and parts of Solano County and Sonoma County. Major cities in the district include Davis, Woodland, Napa, Vacaville, and most of Santa Rosa. The new 4th district is solidly Democratic, and is represented by Mike Thompson.

Recent voting history

Election results from statewide races
Year	Office	Results
1992	President	Bush (R) 40.7 - 33.9%
	Senator	Herschensohn (R) 50.0 - 39.7%
	Senator	Feinstein (D) 46.0 - 45.2%
1994	Governor	Wilson (R) 66.4 - 29.0%
1994	Senator
1996	President	Dole (R) 51.3 - 37.8%
1998	Governor
1998	Senator
2000	President	Bush (R) 58.1 - 36.9%
2000	Senator	Campbell (R) 51.1 - 41.8%
2002	Governor	Simon (R) 58.5 - 30.6%
2003	Recall	Y Yes 70.4 - 29.6%
2003	Recall	Schwarzenegger (R) 60.6 - 17.6%
2004	President	Bush (R) 61.3 - 37.4%
2004	Senator	Jones (R) 55.6 - 40.1%
2006	Governor	Schwarzenegger (R) 72.2 - 22.8%
2006	Senator	Mountjoy (R) 50.2 - 44.3%
2008	President	McCain (R) 54.0 - 43.8%
2010	Governor	Whitman (R) 55.3 - 39.3%
2010	Senator	Fiorina (R) 59.5 - 33.7%
2012	President	Romney (R) 57.9 - 39.5%
2012	Senator	Emken (R) 58.5 - 41.5%
2014	Governor	Kashkari (R) 55.1 - 44.9%
2016	President	Trump (R) 54.0 - 39.3%
2016	Senator	Harris (D) 63.3 - 36.7%
2018	Governor	Cox (R) 59.5 - 40.5%
2018	Senator	de Leon (D) 54.7 - 45.3%
2020	President	Trump (R) 53.7 - 43.9%
2021	Recall	Y Yes 58.9 - 41.1%
2022	Governor	Newsom (D) 63.3 - 36.7%
2022	Senator	Padilla (D) 65.7 - 34.3%

Composition

#	County	Seat	Population
33	Lake	Lakeport	68,878
55	Napa	Napa	133,216
95	Solano	Fairfield	449,218
97	Sonoma	Santa Rosa	481,812
113	Yolo	Woodland	220,544

As of 2023, California's 4th congressional district encompasses Lake, Napa, and Yolo Counties, and parts of Sonoma and Solano Counties.

Sonoma County is split between this district and the 2nd district. They are partitioned by Petaluma River, Highway 116, Redwood Highway, Robber Rd, Petersen Rd, Llano Rd, S Wright Rd, W College Ave, Jennings Ave, Administration Dr, Bicentennial Way, Cleveland Ave, Old Redwood Highway, Cross Creek Rd, Sonoma Highway, and Sonoma Creek. The 4th district takes in the cities of Santa Rosa, Rohnert Park, Sonoma, Petaluma, and Cotati, and the census-designated places Boyes Hot Spring, El Verano, Penngrove, Sonoma State University, Kenwood, Glen Ellen, Eldridge, Fetters Hot Springs-Agua Caliente, and Temelec.

Solano County is split between this district and the 8th district. They are partitioned by Soda Springs Rd, Union Pacific, Alamo Dr, Leisure Town Rd, Hawkins Rd, Bay Area Exxextric, Shilo Rd, Collinsville Rd, and Montezuma Slough. The 4th district takes in the cities of Vacaville, Dixon, and Rio Vista, and the census-designated places Hartley and Allendale.

Cities and CDPs with 10,000 or more people

Santa Rosa – 178,127
Vacaville – 102,386
Napa – 77,480
Davis – 66,850
Woodland – 61,032
Petaluma – 59,776
West Sacramento – 53,519
Rohnert Park – 44,390
American Canyon – 21,837
Dixon – 18,988
Clearlake – 16,685
Sonoma – 11,024
Rio Vista – 10,217

2,500 – 10,000 people

University of California, Davis – 8,525
Cotati – 7,584
Winters – 7,195
Hidden Valley Lake – 6,235
Boyes Hot Springs – 6,215
St. Helena – 5,438
Calistoga – 5,228
Lakeport – 5,026
Penngrove – 4,172
Fetters Hot Springs-Agua Caliente – 4,144
El Verano – 3,867
North Lakeport – 3,514
Yountville – 3,436
Kelseyville – 3,382
Clearlake Riviera (Kelseyville Riviera) – 3,410
North Lakeport – 3,314
Esparto – 3,108
Lucerne – 3,067
Esparto – 2,877
Nice – 2,731
Sonoma State University – 2,679
Angwin – 2,633
Clearlake Oaks – 2,551
Hartley – 2,510

List of members representing the district

Member	Party	Dates	Cong ress	Electoral history	Counties
District created March 4, 1873
Sherman Otis Houghton (San Jose)	Republican	March 4, 1873 – March 3, 1875	43rd	Redistricted from the 1st district and re-elected in 1872. lost re-election.	Fresno, Inyo, Kern, Los Angeles, Mariposa, Merced, Mono, Monterey, San Bernardino, San Diego, San Luis Obispo, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Stanislaus, Tulare, Ventura
Peter D. Wigginton (Merced)	Democratic	March 4, 1875 – March 3, 1877	44th	Elected in 1875. Retired.
Romualdo Pacheco (San Luis Obispo)	Republican	March 4, 1877 – February 7, 1878	45th	Lost contested election.
Peter D. Wigginton (Merced)	Democratic	February 7, 1878 – March 3, 1879	45th	Won contested election. Retired.
Romualdo Pacheco (San Luis Obispo)	Republican	March 4, 1879 – March 3, 1883	46th 47th	Elected in 1879. Re-elected in 1880. Retired.
Pleasant B. Tully (Gilroy)	Democratic	March 4, 1883 – March 3, 1885	48th	Elected in 1882. Retired.	San Francisco
William W. Morrow (San Francisco)	Republican	March 4, 1885 – March 3, 1891	49th 50th 51st	Elected in 1884. Re-elected in 1886. Re-elected in 1888. Retired.
John T. Cutting (San Francisco)	Republican	March 4, 1891 – March 3, 1893	52nd	Elected in 1890. Retired.
James G. Maguire (San Francisco)	Democratic	March 4, 1893 – March 3, 1899	53rd 54th 55th	Elected in 1892. Re-elected in 1894. Re-elected in 1896. Lost re-election.
Julius Kahn (San Francisco)	Republican	March 4, 1899 – March 3, 1903	56th 57th	Elected in 1898. Re-elected in 1900. Lost re-election.
Edward J. Livernash (San Francisco)	Democratic/ Union Labor	March 4, 1903 – March 3, 1905	58th	Elected in 1902. Lost re-election.
Julius Kahn (San Francisco)	Republican	March 4, 1905 – December 18, 1924	59th 60th 61st 62nd 63rd 64th 65th 66th 67th 68th	Elected in 1904. Re-elected in 1906. Re-elected in 1908. Re-elected in 1910. Re-elected in 1912. Re-elected in 1914. Re-elected in 1916. Re-elected in 1918. Re-elected in 1920. Re-elected in 1922. Re-elected in 1924. Died.
Vacant		December 18, 1924 – February 17, 1925	68th
Florence Prag Kahn (San Francisco)	Republican	February 17, 1925 – January 3, 1937	68th 69th 70th 71st 72nd 73rd 74th	Elected to finish husband's term. Re-elected in 1926. Re-elected in 1928. Re-elected in 1930. Re-elected in 1932. Re-elected in 1934. Lost re-election.
Franck R. Havenner (San Francisco)	Progressive	January 3, 1937 – January 3, 1939	75th 76th	Elected in 1936. Re-elected in 1938. Lost re-election.
Franck R. Havenner (San Francisco)	Democratic	January 3, 1939 – January 3, 1941	75th 76th	Elected in 1936. Re-elected in 1938. Lost re-election.
Thomas Rolph (San Francisco)	Republican	January 3, 1941 – January 3, 1945	77th 78th	Elected in 1940. Re-elected in 1942. Lost re-election.
Franck R. Havenner (San Francisco)	Democratic	January 3, 1945 – January 3, 1953	79th 80th 81st 82nd	Elected in 1944. Re-elected in 1946. Re-elected in 1948. Re-elected in 1950. Lost re-election.
William S. Mailliard (San Francisco)	Republican	January 3, 1953 – January 3, 1963	83rd 84th 85th 86th 87th	Elected in 1952. Re-elected in 1954. Re-elected in 1956. Re-elected in 1958. Re-elected in 1960. Redistricted to the 6th district.
Robert Leggett (Vallejo)	Democratic	January 3, 1963 – January 3, 1979	88th 89th 90th 91st 92nd 93rd 94th 95th	Elected in 1962. Re-elected in 1964. Re-elected in 1966. Re-elected in 1968. Re-elected in 1970. Re-elected in 1972. Re-elected in 1974. Re-elected in 1976. Retired.	1963–1967 Colusa, Glenn, Lake, Solano, Sutter, Yolo, Yuba
					1967–1973 Colusa, Glenn, Lake, Sacramento (outside the city), Solano, Sutter, Yolo, Yuba
					1973–1975 Colusa, Glenn, Solano, southwestern Sacramento, Sutter, Yolo, Yuba
					1975–1983 Colusa, western Sacramento, Solano, Sutter, Yolo
Vic Fazio (West Sacramento)	Democratic	January 3, 1979 – January 3, 1993	96th 97th 98th 99th 100th 101st 102nd	Elected in 1978. Re-elected in 1980. Re-elected in 1982. Re-elected in 1984. Re-elected in 1986. Re-elected in 1988. Re-elected in 1990. Redistricted to the 3rd district.
Vic Fazio (West Sacramento)	Democratic	January 3, 1979 – January 3, 1993	96th 97th 98th 99th 100th 101st 102nd		1983–1993 Sacramento (outside the city), Solano, Yolo
John Doolittle (Roseville)	Republican	January 3, 1993 – January 3, 2009	103rd 104th 105th 106th 107th 108th 109th 110th	Redistricted from the 14th district and re-elected in 1992. Re-elected in 1994. Re-elected in 1996. Re-elected in 1998. Re-elected in 2000. Re-elected in 2002. Re-elected in 2004. Re-elected in 2006. Retired.	1993–2003 Alpine, Amador, Calaveras, El Dorado, Mono, Placer, northeastern Sacramento, Tuolumne
John Doolittle (Roseville)	Republican	January 3, 1993 – January 3, 2009	103rd 104th 105th 106th 107th 108th 109th 110th		2003–2013 Eastern Butte, El Dorado, Lassen, Modoc, Nevada, Placer, Plumas, Sacramento (Orangevale), Sierra
Tom McClintock (Elk Grove)	Republican	January 3, 2009 – January 3, 2023	111th 112th 113th 114th 115th 116th 117th	Elected in 2008. Re-elected in 2010. Re-elected in 2012. Re-elected in 2014. Re-elected in 2016. Re-elected in 2018. Re-elected in 2020. Redistricted to the 3rd district.
Tom McClintock (Elk Grove)	Republican	January 3, 2009 – January 3, 2023	111th 112th 113th 114th 115th 116th 117th		2013–2023 Eastern central California including Lake Tahoe, Roseville, and Yosemite National Park
Mike Thompson (St. Helena)	Democratic	January 3, 2023 – present	118th	Redistricted from the 5th district and re-elected in 2022.	2023–present Lake, Napa, most of Yolo, parts of Solano and Sonoma

Election results for representatives

1872 • 1874 • 1876 • 1878 • 1880 • 1882 • 1884 • 1886 • 1888 • 1890 • 1892 • 1894 • 1896 • 1898 • 1900 • 1902 • 1904 • 1906 • 1908 • 1910 • 1912 • 1914 • 1916 • 1918 • 1920 • 1922 • 1924 • 1926 • 1928 • 1930 • 1932 • 1934 • 1936 • 1938 • 1940 • 1942 • 1944 • 1946 • 1948 • 1950 • 1952 • 1954 • 1956 • 1958 • 1960 • 1962 • 1964 • 1966 • 1968 • 1970 • 1972 • 1974 • 1976 • 1978 • 1980 • 1982 • 1984 • 1986 • 1988 • 1990 • 1992 • 1994 • 1996 • 1998 • 2000 • 2002 • 2004 • 2006 • 2008 • 2010 • 2012 • 2014 • 2016 • 2018 • 2020 • 2022

1872

1872 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Sherman Otis Houghton (Incumbent)	10,391	53.5
	Democratic	Edward J. Kewen	9,012	46.5
Total votes			19,403	100.0
Turnout
	Republican hold

1874

1874 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Peter D. Wigginton	15,649	48.8
	Republican	Sherman Otis Houghton (Incumbent)	11,090	34.6
	Independent	J. S. Thompson	5,343	16.7
Total votes			32,082	100.0
Turnout
	Democratic gain from Republican

1876

1876 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Romualdo Pacheco	19,104	50.0
	Democratic	Peter D. Wigginton (Incumbent)	19,103	50.0
Total votes			38,207	100.0
Turnout
	Republican gain from Democratic

1878

1878 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Romualdo Pacheco	15,391	40.5
	Democratic	Wallace A. Leach	12,109	31.8
	Workingman's	James J. Ayers	10,527	27.7
Total votes			38,027	100.0
Turnout
	Republican hold

1880

1880 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Romualdo Pacheco (Incumbent)	17,768	45.8
	Democratic	Wallace A. Leach	17,577	45.3
	Greenback	J. F. Godfrey	3,435	8.9
Total votes			38,780	100.0
Turnout
	Republican hold

1882

1882 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Pleasant B. Tully	23,105	54.4
	Republican	George Lemuel Woods	18,387	43.3
	Populist	M. V. Wright	650	1.5
	Prohibition	Isaac Kinley	355	0.8
Total votes			42,497	100.0
Turnout
	Democratic gain from Republican

1884

1884 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	William W. Morrow	15,083	58.8
	Democratic	R. P. Hastings	10,422	40.6
	Populist	H. S. Fitch	123	0.5
	Prohibition	George Babcock	15	0.1
Total votes			25,643	100.0
Turnout
	Republican gain from Democratic

1886

1886 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	William W. Morrow (Incumbent)	11,413	48.6
	Democratic	Frank McCoppin	9,854	42.0
	Independent	Charles Allen Sumner	2,104	9.0
	Prohibition	Robert Thompson	84	0.4
Total votes			23,455	100.0
Turnout
	Republican hold

1888

1888 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	William W. Morrow (Incumbent)	14,217	50.8
	Democratic	Robert Ferral	13,624	48.6
	Socialist	Frank M. Pixley	173	0.6
Total votes			28,014	100.0
Turnout
	Republican hold

1890

1890 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	John Tyler Cutting	13,196	49.2
	Democratic	Robert Ferral	12,091	45.1
	Socialist	Thomas V. Cator	1,492	5.6
	Prohibition	Joseph Rowell	50	0.2
Total votes			26,829	100.0
Turnout
	Republican hold

1892

1892 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	James G. Maguire	14,997	49.2
	Republican	Charles O. Alexander	13,226	43.4
	Populist	Edgar P. Burman	1,980	6.5
	Prohibition	Henry Collins	296	1.0
Total votes			30,499	100.0
Turnout
	Democratic gain from Republican

1894

1894 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	James G. Maguire (Incumbent)	14,748	48.3
	Republican	Thomas B. Shannon	9,785	32.0
	Populist	B. K. Collier	5,627	18.4
	Prohibition	Joseph Rowell	388	1.3
Total votes			30,548	100.0
Turnout
	Democratic hold

1896

1896 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	James G. Maguire (Incumbent)	19,074	61.0
	Republican	Thomas B. O'Brien	10,940	35.0
	Socialist Labor	E. T. Kingsley	968	3.0
	Prohibition	Joseph Rowell	299	1.0
Total votes			31,281	100.0
Turnout
	Democratic hold

1898

1898 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Julius Kahn	13,695	50.0
	Democratic	James H. Barry	12,084	44.1
	Socialist Labor	W. J. Martin	1,006	3.7
	Independent	Joseph P. Kelly	594	2.2
Total votes			27,379	100.0
Turnout
	Republican gain from Democratic

1900

1900 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Julius Kahn (Incumbent)	17,111	55.2
	Democratic	R. Porter Ashe	11,742	37.8
	Independent	C. C. O'Donnell	1,116	3.6
	Socialist	G. B. Benham	969	3.1
	Prohibition	Joseph Rowell	84	0.3
Total votes			31,022	100.0
Turnout
	Republican hold

1902

1902 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Edward J. Livernash	16,146	49.2
	Republican	Julius Kahn (Incumbent)	16,005	48.7
	Socialist	William Costley	616	1.9
	Prohibition	Joseph Rowell	69	0.2
Total votes			16,836	100.0
Turnout
	Democratic gain from Republican

1904

1904 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Julius Kahn	20,012	57.0
	Democratic	Edward J. Livernash (Incumbent)	12,812	36.4
	Socialist	William Costley	2,267	6.4
Total votes			35,091	100.0
Turnout
	Republican gain from Democratic

1906

1906 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Julius Kahn (Incumbent)	5,678	62.4
	Democratic	David S. Hirshberg	3,016	33.2
	Socialist	Oliver Everett	399	4.4
Total votes			9,093	100.0
Turnout
	Republican hold

1908

1908 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Julius Kahn (Incumbent)	9,202	52.7
	Democratic	James G. Maguire	7,497	42.9
	Socialist	K. J. Doyle	699	4.0
	Prohibition	William N. Meserve	60	0.3
Total votes			17,458	100.0
Turnout
	Republican hold

1910

1910 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Julius Kahn (Incumbent)	10,188	56.5
	Democratic	Walter MacArthur	6,636	36.8
	Socialist	Austin Lewis	1,178	6.5
	Prohibition	E. F. Dinsmore	35	0.2
Total votes			18,037	100.0
Turnout
	Republican hold

1912

1912 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Julius Kahn (Incumbent)	25,515	56.1
	Democratic	Bert Schlesinger	14,884	32.7
	Socialist	Norman W. Pendleton	5,090	11.2
Total votes			45,489	100.0
Turnout
	Republican hold

1914

1914 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Julius Kahn (Incumbent)	41,044	69.1
	Democratic	Henry Colombat	13,550	22.8
	Socialist	Allen K. Gifford	3,928	6.6
	Prohibition	J. C. Westenberg	895	1.5
Total votes			59,417	100.0
Turnout
	Republican hold

1916

1916 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Julius Kahn (Incumbent)	51,968	77.2
	Democratic	J. M. Fernald	10,579	15.7
	Socialist	Allen K. Gifford	3,775	5.6
	Prohibition	Henry W. Hutchinson	981	1.5
Total votes			67,303	100.0
Turnout
	Republican hold

1918

1918 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Julius Kahn (Incumbent)	38,278	86.6
	Socialist	Hugo Ernst	5,913	13.4
Total votes			43,191	100.0
Turnout
	Republican hold

1920

1920 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Julius Kahn (Incumbent)	50,841	84.6
	Socialist	Hugo Ernst	9,289	15.4
Total votes			60,130	100.0
Turnout
	Republican hold

1922

1922 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Julius Kahn (Incumbent)	46,527	83
	Socialist	Hugo Ernst	9,547	17
Total votes			56,074	100
Turnout
	Republican hold

1924

1924 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Julius Kahn (Incumbent)	44,048	81
	Socialist	William McDevitt	10,360	19
Total votes			54,408	100
Turnout
	Republican hold

1926

1926 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Florence Prag Kahn (Incumbent)	37,353	63.4
	Democratic	Chauncey F. Tramutulo	18,210	32.5
	Socialist	Harry W. Hutton	2,960	5.1
Total votes			58,523	100.0
Turnout
	Republican hold

1928

1928 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Florence Prag Kahn (Incumbent)	50,206	76
	Independent	Harry W. Hutton	16,838	24
Total votes			67,044	100
Turnout
	Republican hold

1930

1930 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Florence Prag Kahn (Incumbent)	47,397	100.0
Turnout
	Republican hold

1932

1932 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Florence Prag Kahn (Incumbent)	67,425	85.3
	Socialist	Milen C. Dempster	11,603	14.7
Total votes			79,028	100.0
Turnout
	Republican hold

1934

1934 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Florence Prag Kahn (Incumbent)	50,491	48.0
	Democratic	Chauncey Tramutolo	46,871	44.5
	Progressive	Raymond A. Burr	3,636	3.5
	Socialist	Samuel S. White	2,414	2.3
	Communist	Minnie Carson	1,810	1.7
Total votes			105,222	100.0
Turnout
	Republican hold

1936

1936 United States House of Representatives elections
Party		Candidate	Votes	%
	Progressive	Franck R. Havenner	64,063	58.5
	Republican	Florence Prag Kahn (Incumbent)	43,805	40.0
	Communist	Anita Whitney	1,711	1.5
Total votes			109,579	100.0
Turnout
	Progressive gain from Republican

1938

1938 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Franck R. Havenner (Incumbent)	64,452	61.2
	Republican	Kennett B. Dawson	40,842	38.8
Total votes			105,294	100.0
Turnout
	Democratic hold

1940

1940 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Thomas Rolph	75,369	54.6
	Democratic	Franck R. Havenner (Incumbent)	61,341	44.4
	Communist	Archie Brown	1,322	1.0
Total votes			138,032	100.0
Turnout
	Republican gain from Democratic

1942

1942 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Thomas Rolph (Incumbent)	62,735	98.3
	Communist	Archie Brown (write-in)	1,116	1.7
Total votes			63,851	100.0
Turnout
	Republican hold

1944

1944 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Franck R. Havenner	73,582	50.1
	Republican	Thomas Rolph (Incumbent)	73,367	49.9
Total votes			146,949	100.0
Turnout
	Democratic gain from Republican

1946

1946 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Franck R. Havenner (Incumbent)	60,655	52.9
	Republican	Truman R. Young	54,113	47.1
Total votes			114,768	100.0
Turnout
	Democratic hold

1948

1948 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Franck R. Havenner (Incumbent)	73,704	51.0
	Republican	William S. Mailliard	68,875	47.7
	Progressive	Francis J. McTernan Jr.	1,949	1.3
Total votes			144,528	100.0
Turnout
	Democratic hold

1950

1950 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Franck R. Havenner (Incumbent)	83,078	67.2
	Republican	Raymond D. Smith	40,569	32.8
Total votes			123,647	100.0
Turnout
	Democratic hold

1952

1952 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	William S. Mailliard	102,359	55
	Democratic	Franck R. Havenner (Incumbent)	83,748	45
Total votes			186,107	100
Turnout
	Republican gain from Democratic

1954

1954 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	William S. Mailliard (Incumbent)	88,439	61.2
	Democratic	Philip A. O'Rourke	52,980	36.7
	Progressive	George R. Andersen	2,987	2.1
Total votes			144,406	100.0
Turnout
	Republican hold

1956

1956 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	William S. Mailliard (Incumbent)	109,188	61.9
	Democratic	James L. Quigley	67,132	38.1
Total votes			176,320	100.0
Turnout
	Republican hold

1958

1958 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	William S. Mailliard (Incumbent)	98,574	63.9
	Democratic	George D. Collins Jr.	65,798	36.1
Total votes			164,372	100.0
Turnout
	Republican hold

1960

1960 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	William S. Mailliard (Incumbent)	118,249	65.3
	Democratic	Phillips S. Davies	62,814	34.7
Total votes			181,063	100.0
Turnout
	Republican hold

1962

1962 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Robert L. Leggett	55,563	56.5
	Republican	L. V. Honsinger	42,762	43.5
Total votes			98,325	100.0
Turnout
	Democratic win (new seat)

1964

1964 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Robert L. Leggett (Incumbent)	84,949	71.9
	Republican	Ivan Norris	33,160	28.1
Total votes			118,109	100.0
Turnout
	Democratic hold

1966

1966 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Robert L. Leggett (Incumbent)	67,942	60
	Republican	Tom McHatton	46,337	40
Total votes			114,279	100.0
Turnout
	Democratic hold

1968

1968 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Robert L. Leggett (Incumbent)	88,067	55.5
	Republican	James Shumway	65,942	41.6
	American Independent	Gene Clark	4,545	2.9
Total votes			158,554	100.0
Turnout
	Democratic hold

1970

1970 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Robert L. Leggett (Incumbent)	103,485	68
	Republican	Andrew Gyorke	48,783	32
Total votes			152,268	100
Turnout
	Democratic hold

1972

1972 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Robert L. Leggett (Incumbent)	114,673	67.4
	Republican	Benjamin Chang	55,367	32.6
Total votes			170,040	100.0
Turnout
	Democratic hold

1974

1974 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Robert L. Leggett (Incumbent)	100,934	100.0
Turnout
	Democratic hold

1976

1976 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Robert L. Leggett (Incumbent)	75,844	50.2
	Republican	Rex Hime	75,193	49.8
Total votes			151,037	100.0
Turnout
	Democratic hold

1978

1978 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Vic Fazio	87,764	55.4
	Republican	Rex Hime	70,733	44.6
Total votes			158,497	100.0
Turnout
	Democratic hold

1980

1980 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Vic Fazio (Incumbent)	133,853	65.3
	Republican	Albert Dehr	60,935	29.7
	Libertarian	Robert J. Burnside	10,267	5.0
Total votes			205,055	100.0
Turnout
	Democratic hold

1982

1982 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Vic Fazio (Incumbent)	118,476	63.9
	Republican	Roger B. Canfield	67,047	36.1
Total votes			185,523	100.0
Turnout
	Democratic hold

1984

1984 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Vic Fazio (Incumbent)	130,109	61.4
	Republican	Roger B. Canfield	77,773	36.7
	Libertarian	Roger Conant Pope	4,039	1.9
Total votes			211,921	100.0
Turnout
	Democratic hold

1986

1986 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Vic Fazio (Incumbent)	128,364	70.2
	Republican	Jack D. Hite	54,596	29.8
Total votes			182,960	100.0
Turnout
	Democratic hold

1988

1988 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Vic Fazio (Incumbent)	181,184	100.0
	No party	Write-ins	1,306	0.0
Turnout
	Democratic hold

1990

1990 United States House of Representatives elections
Party		Candidate	Votes	%
	Democratic	Vic Fazio (Incumbent)	115,090	54.7
	Republican	Mark R. Baughman	82,738	39.3
	Libertarian	Bryce Bigwood	12,626	6.0
Total votes			210,454	100.0
Turnout
	Democratic hold

1992

1992 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	John Doolittle (Incumbent)	141,155	49.8
	Democratic	Patricia Malberg	129,489	45.7
	Libertarian	Patrick Lee McHargue	12,705	4.5
	No party	Brooksher (write-in)	16	0.0
Total votes			283,265	100.0
Turnout
	Republican hold

1994

1994 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	John Doolittle (Incumbent)	144,936	61.33
	Democratic	Katie Hirning	82,505	34.91
	Libertarian	Damon C. Falconi	8,882	3.76
Total votes			236,323	100.0
Turnout
	Republican hold

1996

1996 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	John Doolittle (Incumbent)	164,048	60.5
	Democratic	Katie Hirning	97,948	36.1
	Libertarian	Patrick McHargue	9,319	3.4
Total votes			271,315	100.0
Turnout
	Republican hold

1998

1998 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	John Doolittle (Incumbent)	155,306	62.57
	Democratic	David Shapiro	85,394	34.40
	Libertarian	Dan Winterrowd	7,524	3.03
Total votes			248,224	100.0
Turnout
	Republican hold

2000

2000 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	John Doolittle (Incumbent)	197,503	63.5
	Democratic	Mark A. Norberg	97,974	31.5
	Libertarian	William Fritz Frey	9,494	3.0
	Natural Law	Robert E. Ray	6,452	2.0
Total votes			311,423	100.0
Turnout
	Republican hold

2002

2002 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	John Doolittle (Incumbent)	139,280	64.9
	Democratic	Mark A. Norberg	68,755	32.0
	Libertarian	Allen M. Roberts	6,834	3.1
Total votes			214,869	100.0
Turnout
	Republican hold

2004

2004 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	John Doolittle (Incumbent)	221,926	65.4
	Democratic	David I. Winters	117,443	34.6
Total votes			339,369	100.0
Turnout
	Republican hold

2006

2006 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	John Doolittle (Incumbent)	135,818	49.1
	Democratic	Charlie Brown	126,999	45.9
	Libertarian	Dan Warren	14,076	5.0
Total votes			213,984	100.0
Turnout
	Republican hold

2008

2008 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Tom McClintock	184,543	50.3
	Democratic	Charlie Brown	182,967	49.7
Total votes			367,510	100.0
Turnout
	Republican hold

2010

2010 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Tom McClintock	186,392	61%
	Democratic	Clint Curtis	95,653	31%
	Green	Benjamin Emery	22,179	8%
Total votes			304,224	100%
Turnout
	Republican hold

2012

United States House of Representatives elections, 2012
Party		Candidate	Votes	%
	Republican	Tom McClintock (Incumbent)	197,803	61.1%
	Democratic	Jack Uppal	125,885	38.9%
Total votes			323,688	100.0%
	Republican hold

2014

United States House of Representatives elections, 2014
Party		Candidate	Votes	%
	Republican	Tom McClintock (Incumbent)	126,784	60.0%
	Republican	Arthur "Art" Moore	84,350	40.0%
Total votes			211,134	100.0%
	Republican hold

2016

United States House of Representatives elections, 2016
Party		Candidate	Votes	%
	Republican	Tom McClintock (Incumbent)	220,133	62.7%
	Democratic	Robert W. Derlet	130,845	37.3%
Total votes			350,978	100.0%
	Republican hold

2018

2018 United States House of Representatives elections
Party		Candidate	Votes	%
	Republican	Tom McClintock	184,401	54.1%
	Democratic	Jessica Morse	156,253	45.9%
Total votes			340,654	100%
Turnout
	Republican hold

In 2018, six Democratic candidates filed statements of candidacy with the Federal Election Commission (FEC). They were, in alphabetical order by last name: Regina Bateson; Roza Calderon; Richard Martin; Robert Lawton; Jessica Morse; and Rochelle Wilcox. Martin and Wilcox dropped out of the race, with Wilcox endorsing Morse in February.

Retired Air Force Lieutenant Colonel Charlie Brown, who was the Democratic nominee for this seat in 2006 and 2008, was "seriously considering" running in 2018, but decided in June 2017 against a third campaign. In January 2018, Brown endorsed Morse for the nomination. Bob Derlet, the Democratic nominee in 2016, also endorsed Morse in January.

On the Republican side, McClintock had one challenger, Mitchell Kendrick White, who filed with the FEC in January.

In February, the California Democratic Party (CDP) endorsed Jessica Morse in a contested nomination. Roza Calderon was able to successfully collect 322 CDP-credentialed delegate signatures needed to block the endorsement, in which Morse only received 44 delegate votes. However, CDP staff refused to accept the forms after it was alleged they closed doors early to prevent the submission. A petition was later filed with the Compliance Review Commission (CRC) by Calderon. The CRC voted to accept and count the signatures, ultimately disqualifying enough signatures to proceed with Morse's endorsement.

California allows candidates to include their professional description under their names on the ballot. Regina Bateson challenged Morse's ballot designation title of "National Security Fellow" at the Sacramento Superior Court after months of controversy that Morse was "fluffing" her credentials. California's Secretary of State, Alex Padilla, struck down Morse's three ballot designations before Judge Gevercer ruled that she presented "no credible evidence" to use the ballot designation of "National Security Fellow". Instead, he held that this title would mislead the average person about her recent activities. In the official Certified Candidate List for the primary election, Morse's ballot designation was left blank.

Under the California nonpartisan blanket ("jungle") primary system, only the two candidates with the most votes on June 5, regardless of party, went on to the general election on November 6. Two Republicans and four Democrats appeared on the primary ballot. Morse finished second, qualifying for the general election ballot, along with McClintock.

For the November ballot, Morse was also denied "National Security" as her designation. In the November general election, McClintock held the district with an advantage of more than eight percentage points.

2020

2020 United States House of Representatives elections in California
Party		Candidate	Votes	%
	Republican	Tom McClintock (incumbent)	247,291	55.9
	Democratic	Brynne S. Kennedy	194,731	44.1
Total votes			442,022	100.0
	Republican hold

2022

2022 United States House of Representatives elections in California
Party		Candidate	Votes	%
	Democratic	Mike Thompson (incumbent)	176,900	67.8
	Republican	Matt Brock	84,007	32.2
Total votes			260,907	100.0
	Democratic hold

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