Missouri's third congressional district is in the eastern and central portion of the state. It stretches from the southern part of Columbia (including the University of Missouri) and the state capital of Jefferson City in the west to St. Charles County (including the large suburbs of St. Charles, St. Peters and Wentzville) and western Jefferson County in the east. The district took its current form in 2023, when Cooper and parts of Boone counties were added to the district, while Franklin and most of Warren counties were instead drawn into the 2nd district, and much of Lincoln County moved to the 6th district. Its current representative is Republican Blaine Luetkemeyer.

From 1953 to 2013, the 3rd had been located in the southern portion of the St. Louis area, including the southern third of St. Louis City, and had a dramatically different political history from the current 3rd. Its best-known congressman was Dick Gephardt, who represented the district for 28 years until his retirement from Congress.

Following a dramatic drop in the population of St. Louis in the 2010 United States census, Missouri lost a congressional seat effective in 2013. Redistricting maps indicated that the 3rd district would be dismantled. The 3rd's home base in St. Louis would be absorbed by Missouri's 1st congressional district. Much of the district outside the St. Louis area would be drawn into the 8th district. Meanwhile, the new 3rd included most of the territory currently in the 9th district, which was dissolved.

Year	Office	Results
2000	President	Al Gore 54 - George W. Bush 43%
2004	President	John Kerry 57 - George W. Bush 43%
2008	President	Barack Obama 60 - John McCain 39%
2012	President	Mitt Romney 62 - Barack Obama 36%
2016	President	Donald Trump 67 - Hillary Clinton 28%
2020	President	Donald Trump 67 - Joe Biden 31%

#	County	Seat	Population
19	Boone	Columbia	189,463
27	Callaway	Fulton	44,731
29	Camden	Camdenton	44,044
51	Cole	Jefferson City	77,278
53	Cooper	Boonville	16,947
55	Crawford	Steelville	22,719
73	Gasconade	Hermann	14,705
99	Jefferson	Hillsboro	231,230
125	Maries	Vienna	8,430
131	Miller	Tuscumbia	25,590
135	Moniteau	California	15,256
139	Montgomery	Montgomery City	11,459
151	Osage	Linn	13,468
183	St. Charles	St. Charles	416,659
219	Warren	Warrenton	37,806
221	Washington	Potosi	23,534

• Columbia – 129,330
• O'Fallon – 94,074
• St. Charles – 70,493
• St. Peters – 57,732
• Wentzville – 44,372
• Jefferson City – 42,552
• Lake St. Louis – 16,707
• Fulton – 12,600
• Eureka – 11,646

• Warrenton – 8,429
• Boonville – 7,894
• Sullivan – 6,906
• De Soto – 6,449
• Cottleville – 5,611
• Weldon Spring – 5,326
• Ashland – 5,026
• Wright City – 4,881
• Holts Summit – 4,832
• Osage Beach – 4,637
• Eldon – 4,509
• California – 4,498
• High Ridge – 4,242
• Hillsboro – 3,473
• Cuba – 3,181
• Byrnes Mill – 3,173
• St. Paul – 3,005
• Tipton – 2,920
• Montgomery City – 2,811
• Owensville – 2,758
• Potosi – 2,538

Member	Party	Years	Cong ress	Electoral history	District location
District created March 4, 1847
James S. Green (Canton)	Democratic	March 4, 1847 – March 3, 1851	30th 31st	Elected in 1846. Re-elected in 1848. Retired.
John G. Miller (Boonville)	Whig	March 4, 1851 – March 3, 1853	32nd	Elected in 1850. Redistricted to the 5th district.
James J. Lindley (Monticello)	Whig	March 4, 1853 – March 3, 1855	33rd 34th	Elected in 1852. Re-elected in 1854. Retired.
	Opposition	March 4, 1855 – March 3, 1857
Vacant		March 4, 1857 – December 7, 1857	35th
John B. Clark (Fayette)	Democratic	December 7, 1857 – July 13, 1861	35th 36th 37th	Elected after James S. Green was elected to US Senate prior to being seated. Re-elected in 1858. Re-elected in 1860. Expelled after taking up arms against the Union.
Vacant		July 13, 1861 – January 20, 1862	37th
William A. Hall (Huntsville)	Democratic	January 20, 1862 – March 3, 1863		Elected to finish Clark's term. Redistricted to the 8th district.
John W. Noell (Perryville)	Unconditional Unionist	March 4, 1863 – March 14, 1863	38th	Redistricted from the 7th district and Re-elected in 1862. Died.
Vacant		March 14, 1863 – December 7, 1863
John G. Scott (Irondale)	Democratic	December 7, 1863 – March 3, 1865		Elected to finish Noell's term. Retired.
Thomas E. Noell (Perryville)	Republican	March 4, 1865 – March 3, 1867	39th 40th	Elected in 1864. Re-elected in 1866. Died.
	Democratic	March 4, 1867 – October 3, 1867
Vacant		October 3, 1867 – December 17, 1867	40th
James R. McCormick (Arcadia)	Democratic	December 17, 1867 – March 3, 1873	40th 41st 42nd	Elected to finish Noell's term. Re-elected in 1868. Re-elected in 1870. Retired.
William H. Stone (St. Louis)	Democratic	March 4, 1873 – March 3, 1877	43rd 44th	Elected in 1872. Re-elected in 1874. Retired.
Lyne Metcalfe (St. Louis)	Republican	March 4, 1877 – March 3, 1879	45th	Elected in 1876. Lost re-election.
Richard G. Frost (St. Louis)	Democratic	March 4, 1879 – March 2, 1883	46th 47th	Elected in 1878. Re-elected in 1880. Retired but lost contested election before next term began.
Gustavus Sessinghaus (St. Louis)	Republican	March 2, 1883 – March 3, 1883	47th	Won contested election. Lost re-election.
Alexander M. Dockery (Gallatin)	Democratic	March 4, 1883 – March 3, 1899	48th 49th 50th 51st 52nd 53rd 54th 55th	Elected in 1882. Re-elected in 1884. Re-elected in 1886. Re-elected in 1888. Re-elected in 1890. Re-elected in 1892. Re-elected in 1894. Re-elected in 1896. Retired to run for governor.
John Dougherty (Liberty)	Democratic	March 4, 1899 – March 3, 1905	56th 57th 58th	Elected in 1898. Re-elected in 1900. Re-elected in 1902. Lost renomination.
Frank B. Klepper (Kingston)	Republican	March 4, 1905 – March 3, 1907	59th	Elected in 1904. Lost re-election.
Joshua W. Alexander (Gallatin)	Democratic	March 4, 1907 – December 15, 1919	60th 61st 62nd 63rd 64th 65th 66th	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. Resigned when appointed US Secretary of Commerce
Vacant		December 15, 1919 – February 14, 1920	66th
Jacob L. Milligan (Richmond)	Democratic	February 14, 1920 – March 3, 1921		Elected to finish Alexander's term. Lost re-election.
Henry F. Lawrence (Cameron)	Republican	March 4, 1921 – March 3, 1923	67th	Elected in 1920. Lost re-election.
Jacob L. Milligan (Richmond)	Democratic	March 4, 1923 – March 3, 1933	68th 69th 70th 71st 72nd	Elected in 1922. Re-elected in 1924. Re-elected in 1926. Re-elected in 1928. Re-elected in 1930. Redistricted to the at-large district.
District inactive		March 4, 1933 – January 3, 1935	73rd	All representatives elected At-large on a general ticket.
Richard M. Duncan (St. Joseph)	Democratic	January 3, 1935 – January 3, 1943	74th 75th 76th 77th	Redistricted from the at-large district and re-elected in 1934. Re-elected in 1936. Re-elected in 1938. Re-elected in 1940. Lost re-election.
William C. Cole (St. Joseph)	Republican	January 3, 1943 – January 3, 1949	78th 79th 80th	Elected in 1942. Re-elected in 1944. Re-elected in 1946. Lost re-election.
Phil J. Welch (St. Joseph)	Democratic	January 3, 1949 – January 3, 1953	81st 82nd	Elected in 1948. Re-elected in 1950. Retired to run for governor.
Leonor Sullivan (St. Louis)	Democratic	January 3, 1953 – January 3, 1977	83rd 84th 85th 86th 87th 88th 89th 90th 91st 92nd 93rd 94th	Elected in 1952. Re-elected in 1954. Re-elected in 1956. Re-elected in 1958. Re-elected in 1960. Re-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. Retired.	1953–1963 [data missing]
					1963–1973 [data missing]
					1973–1983 [data missing]
Dick Gephardt (St. Louis)	Democratic	January 3, 1977 – January 3, 2005	95th 96th 97th 98th 99th 100th 101st 102nd 103rd 104th 105th 106th 107th 108th	Elected in 1976. Re-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. Re-elected in 1992. Re-elected in 1994. Re-elected in 1996. Re-elected in 1998. Re-elected in 2000. Re-elected in 2002. Retired to run for Democratic nominee for president.
					1983–1993 [data missing]
					1993–2003 [data missing]
					2003–2013
Russ Carnahan (St. Louis)	Democratic	January 3, 2005 – January 3, 2013	109th 110th 111th 112th	Elected in 2004. Re-elected in 2006. Re-elected in 2008. Re-elected in 2010. Redistricted to the 1st district and lost renomination.
Blaine Luetkemeyer (St. Elizabeth)	Republican	January 3, 2013 – present	113th 114th 115th 116th 117th 118th	Redistricted from the 9th district and re-elected in 2012. Re-elected in 2014. Re-elected in 2016. Re-elected in 2018. Re-elected in 2020. Re-elected in 2022. Retiring at end of term.	2013–2023
					2023–present
Bob Onder (elect) (Lake St. Louis)	Republican	January 3, 2025		Elected in 2024.

Missouri's 3rd congressional district, 2012

Party		Candidate	Votes	%
	Republican	Blaine Luetkemeyer (incumbent)	214,843	63.5
	Democratic	Eric C. Mayer	111,189	32.8
	Libertarian	Steven Wilson	12,353	3.7
Total votes			338,385	100.0
	Republican hold

Missouri's 3rd congressional district, 2014

Party		Candidate	Votes	%
	Republican	Blaine Luetkemeyer (incumbent)	130,940	68.3
	Democratic	Courtney Denton	52,021	27.2
	Libertarian	Steven Hedrick	8,593	4.5
	Independent	Harold Davis (write-in)	66	0.0
Total votes			191,620	100.0
	Republican hold

Missouri's 3rd congressional district, 2016

Party		Candidate	Votes	%
	Republican	Blaine Luetkemeyer (incumbent)	249,865	67.8
	Democratic	Kevin Miller	102,891	27.9
	Libertarian	Dan Hogan	11,962	3.3
	Constitution	Doanita Simmons	3,605	1.0
	Independent	Harold Davis (write-in)	10	0.0
Total votes			368,333	100.0
	Republican hold

Missouri's 3rd congressional district, 2018

Party		Candidate	Votes	%
	Republican	Blaine Luetkemeyer (incumbent)	211,243	65.1
	Democratic	Katy Geppert	106,589	32.8
	Libertarian	Donald Stolle	6,776	2.1
Total votes			324,608	100.0
	Republican hold

Missouri's 3rd congressional district, 2020

Party		Candidate	Votes	%
	Republican	Blaine Luetkemeyer (incumbent)	282,866	69.4
	Democratic	Megan Rezabek	116,095	28.5
	Libertarian	Leonard J. Steinman II	8,344	2.1
	Write-in		43	0.0
Total votes			407,348	100.0
	Republican hold

• Missouri's congressional districts
• List of United States congressional districts

• Martis, Kenneth C. (1989). The Historical Atlas of Political Parties in the United States Congress. New York: Macmillan Publishing Company.
• Martis, Kenneth C. (1982). The Historical Atlas of United States Congressional Districts. New York: Macmillan Publishing Company.
• Congressional Biographical Directory of the United States 1774–present
• https://web.archive.org/web/20131013222920/http://2010.census.gov/2010census/popmap/

38°34′41″N 91°33′48″W / 38.57806°N 91.56333°W / 38.57806; -91.56333