Connecticut is a state in the New England region of the United States. One of the original Thirteen Colonies, Connecticut has participated in all fifty-nine U.S. presidential elections since the American Revolution. In the early days of the United States, Connecticut was known for supporting the conservative Federalist Party. In the Second Party System, Connecticut leaned towards the anti-Jackson candidates. Following the Civil War, Connecticut was a swing state for a long time until 1896. Thereafter until 1932, Connecticut was a Republican stronghold. During this period, Connecticut Republican Party chairman J. Henry Roraback built up a political machine which was "efficient, conservative, penurious, and in absolute control".

During the Great Depression, Connecticut began to pivot in support of Democratic candidates. After that, although the Republican Party won Connecticut several times in the presidential election, its advantage was no longer as significant as it had previously been. Since 1992, the state has voted consistently for the Democratic candidates.

In 2020, Joe Biden became the first candidate in Connecticut history to win over one million votes in the state, scoring nearly 1.1 million votes.

Connecticut is a signatory of the National Popular Vote Interstate Compact, an interstate compact in which signatories award all of their electoral votes to the winner of the national-level popular vote in a presidential election, even if another candidate won an individual signatory's popular vote. As of 2023, it has not yet gone into force.

Presidential elections

Key for parties

American Independent Party – (AI)   Anti-Masonic Party – (Anti-M)   Communist Party USA – (CPUSA)   Constitutional Union Party – (CU)   Democratic Party – (D)   Democratic-Republican Party – (DR)   Free Soil Party – (FS)   Federalist Party – (F)   Green Party – (G)   Greenback Party – (GB)   Independent candidate – (I)   Know Nothing Party – (KN)   Liberal Republican Party – (LR)   Libertarian Party – (LI)   National Democratic Party – (ND)   National Republican Party – (NP)   National Union Party – (NU)   Progressive Party (1912) – (PR-1912)   Progressive Party (1924) – (PR-1924)   Progressive Party (1948) – (PR-1948)   Prohibition Party – (PRO)   Reform Party – (RE)   Republican Party – (R)   Socialist Party of America – (S)   Southern Democratic Party – (SD)   Whig Party – (W)   Union Party – (U) Note – A double dagger (‡) indicates the national winner.

1788–89 to 1820

As a part of New England, Connecticut was the stronghold of the Federalist Party. It voted for Federalist candidates in presidential elections from 1796 to 1816. Before 1820, its electors were appointed by state legislature.

Presidential elections in Connecticut from 1788–89 to 1820

Year	Winner				Runner-up				EV	Ref.
	Candidate		Votes	%	Candidate		Votes	%
1788–89		George Washington (I)‡	–	–	–		–	–	7
1792		George Washington (I)‡	–	–	–		–	–	9
1796		John Adams (F)‡	–	–		Thomas Jefferson (DR)	–	–	9
1800		John Adams (F)	–	–		Thomas Jefferson (DR)‡	–	–	9
1804		Charles C. Pinckney (F)	–	–		Thomas Jefferson (DR)‡	–	–	9
1808		Charles C. Pinckney (F)	–	–		James Madison (DR)‡	–	–	9
1812		DeWitt Clinton (F)	–	–		James Madison (DR)‡	–	–	9
1816		Rufus King (F)	–	–		James Monroe (DR)‡	–	–	9
1820		James Monroe (DR)‡	3,871	84.17%		Unpledged electors (F)	728	15.83%	9

1824

The election of 1824 was a complex realigning election following the collapse of the prevailing Democratic-Republican Party, resulting in four different candidates each claiming to carry the banner of the party, and competing for influence in different parts of the country. The election was the only one in history to be decided by the House of Representatives under the provisions of the Twelfth Amendment to the United States Constitution after no candidate secured a majority of the electoral vote. It was also the only presidential election in which the candidate who received a plurality of electoral votes (Andrew Jackson) did not become president, a source of great bitterness for Jackson and his supporters, who proclaimed the election of Adams a corrupt bargain.

1860 Presidential election in Connecticut

Year	Winner			Runner-up			Runner-up			Runner-up			EV	Ref.
	Candidate		Votes (%)	Candidate		Votes (%)	Candidate		Votes (%)	Candidate		Votes (%)
1824		John Quincy Adams (DR)‡	7,494 (70.39%)		William H. Crawford (DR)	1,965 (18.46%)		Andrew Jackson (DR)	–		Henry Clay (DR)	–	8

1828 to 1856

Presidential elections in Connecticut from 1828 to 1856

Year	Winner				Runner-up				Other candidate				EV	Ref.
	Candidate		Votes	%	Candidate		Votes	%	Candidate		Votes	%
1828		John Quincy Adams (NR)	13,829	71.36%		Andrew Jackson (D)‡	4,448	22.95%	–		–	–	8
1832		Henry Clay (NR)	18,155	55.29%		Andrew Jackson (D)‡	11,269	34.32%		William Wirt (Anti-M)	3,409	10.38%	8
1836		Martin Van Buren (D)‡	19,294	50.65%		William Henry Harrison (W)	18,799	49.35%	–		–	–	8
1840		William Henry Harrison (W)‡	31,598	55.55%		Martin Van Buren (D)	25,281	44.45%	–		–	–	8
1844		Henry Clay (W)	32,832	50.81%		James K. Polk (D)‡	29,831	46.17%	–		–	–	6
1848		Zachary Taylor (W)‡	30,318	48.59%		Lewis Cass (D)	27,051	43.35%		Martin Van Buren (FS)	5,005	8.02%	6
1852		Franklin Pierce (D)‡	33,249	49.79%		Winfield Scott (W)	30,359	45.46%		John P. Hale (FS)	3,161	4.73%	6
1856		John C. Frémont (R)	42,717	53.18%		James Buchanan (D)‡	34,997	43.57%		Millard Fillmore (KN)	2,615	3.26%	6

1860

The election of 1860 was a complex realigning election in which the breakdown of the previous two-party alignment culminated in four parties each competing for influence in different parts of the country. The result of the election, with the victory of an ardent opponent of slavery, spurred the secession of eleven states and brought about the American Civil War.

1860 Presidential election in Connecticut

Year	Winner			Runner-up			Runner-up			Runner-up			EV	Ref.
	Candidate		Votes (%)	Candidate		Votes (%)	Candidate		Votes (%)	Candidate		Votes (%)
1860		Abraham Lincoln (R)‡	43,486 (53.86%)		Stephen A. Douglas (D)	17,364 (21.5%)		John C. Breckinridge (SD)	16,558 (20.51%)		John Bell (CU)	3,337 (4.13%)	6

1864 to present

Presidential elections in Connecticut from 1864 to present

Year	Winner				Runner-up				Other candidate				EV	Ref.
	Candidate		Votes	%	Candidate		Votes	%	Candidate		Votes	%
1864		Abraham Lincoln (NU)‡	44,693	51.38%		George B. McClellan (D)	42,288	48.62%	–		–	–	6
1868		Ulysses S. Grant (R)‡	50,788	51.49%		Horatio Seymour (D)	47,844	48.51%	–		–	–	6
1872		Ulysses S. Grant (R)‡	50,314	52.41%		Horace Greeley (LR)	45,695	47.59%	–		–	–	6
1876		Samuel J. Tilden (D)	61,927	50.7%		Rutherford B. Hayes (R)‡	59,033	48.33%		Peter Cooper (GB)	774	0.63%	6
1880		James A. Garfield (R)‡	67,071	50.51%		Winfield S. Hancock (D)	64,411	48.5%		James B. Weaver (GB)	868	0.65%	6
1884		Grover Cleveland (D)‡	67,182	48.95%		James G. Blaine (R)	65,898	48.01%		John St. John (PRO)	2,493	1.82%	6
1888		Grover Cleveland (D)	74,920	48.66%		Benjamin Harrison (R)‡	74,584	48.44%		Clinton Fisk (PRO)	4,234	2.75%	6
1892		Grover Cleveland (D)‡	82,395	50.06%		Benjamin Harrison (R)	77,032	46.8%		John Bidwell (PRO)	4,026	2.45%	6
1896		William McKinley (R)‡	110,285	63.24%		William Jennings Bryan (D)	56,740	32.54%		John McAuley Palmer (ND)	4,336	2.49%	6
1900		William McKinley (R)‡	102,572	56.92%		William Jennings Bryan (D)	74,014	41.07%		John G. Woolley (PRO)	1,617	0.9%	6
1904		Theodore Roosevelt (R)‡	111,089	58.12%		Alton B. Parker (D)	72,909	38.15%		Eugene V. Debs (S)	4,543	2.38%	7
1908		William Howard Taft (R)‡	112,915	59.43%		William Jennings Bryan (D)	68,255	35.92%		Eugene V. Debs (S)	5,113	2.69%	7
1912		Woodrow Wilson (D)‡	74,561	39.16%		William Howard Taft (R)	68,324	35.88%		Theodore Roosevelt (PR-1912)	34,129	17.92%	7
1916		Charles Evans Hughes (R)	106,514	49.8%		Woodrow Wilson (D)‡	99,786	46.66%		Allan L. Benson (S)	5,179	2.42%	7
1920		Warren G. Harding (R)‡	229,238	62.72%		James M. Cox (D)	120,721	33.03%		Eugene V. Debs (S)	10,350	2.83%	7
1924		Calvin Coolidge (R)‡	246,322	61.54%		John W. Davis (D)	110,184	27.53%		Robert M. La Follette (PR-1924)	42,416	10.6%	7
1928		Herbert Hoover (R)‡	296,641	53.63%		Al Smith (D)	252,085	45.57%		Norman Thomas (S)	3,029	0.55%	7
1932		Herbert Hoover (R)	288,420	48.54%		Franklin D. Roosevelt (D)‡	281,632	47.4%		Norman Thomas (S)	20,480	3.45%	8
1936		Franklin D. Roosevelt (D)‡	382,129	55.32%		Alf Landon (R)	278,685	40.35%		William Lemke (U)	21,805	3.16%	8
1940		Franklin D. Roosevelt (D)‡	417,621	53.44%		Wendell Willkie (R)	361,819	46.3%		Earl Browder (CPUSA)	1,091	0.14%	8
1944		Franklin D. Roosevelt (D)‡	435,146	52.3%		Thomas E. Dewey (R)	390,527	46.94%		Norman Thomas (S)	5,097	0.61%	8
1948		Thomas E. Dewey (R)	437,754	49.55%		Harry S. Truman (D)‡	423,297	47.91%		Henry A. Wallace (PR-1948)	13,713	1.55%	8
1952		Dwight D. Eisenhower (R)‡	611,012	55.7%		Adlai Stevenson II (D)	481,649	43.91%		Darlington Hoopes (S)	2,244	0.2%	8
1956		Dwight D. Eisenhower (R)‡	711,837	63.72%		Adlai Stevenson II (D)	405,079	36.26%	Others		205	0.02%	8
1960		John F. Kennedy (D)‡	657,055	53.73%		Richard Nixon (R)	565,813	46.27%	Write-ins		15	0%	8
1964		Lyndon B. Johnson (D)‡	826,269	67.81%		Barry Goldwater (R)	390,996	32.09%	Write-ins		1,313	0.11%	8
1968		Hubert Humphrey (D)	621,561	49.48%		Richard Nixon (R)‡	556,721	44.32%		George Wallace (AI)	76,650	6.1%	8
1972		Richard Nixon (R)‡	810,763	58.57%		George McGovern (D)	555,498	40.13%		John G. Schmitz (AI)	17,239	1.25%	8
1976		Gerald Ford (R)	719,261	52.09%		Jimmy Carter (D)‡	647,895	46.92%		Lester Maddox (AI)	7,101	0.51%	8
1980		Ronald Reagan (R)‡	677,210	48.16%		Jimmy Carter (D)	541,732	38.52%		John B. Anderson (I)	171,807	12.22%	8
1984		Ronald Reagan (R)‡	890,877	60.73%		Walter Mondale (D)	569,597	38.83%		Gus Hall (CPUSA)	4,826	0.33%	8
1988		George H. W. Bush (R)‡	750,241	51.98%		Michael Dukakis (D)	676,584	46.87%		Ron Paul (LI)	14,071	0.97%	8
1992		Bill Clinton (D)‡	682,318	42.21%		George H. W. Bush (R)	578,313	35.78%		Ross Perot (I)	348,771	21.58%	8
1996		Bill Clinton (D)‡	735,740	52.83%		Bob Dole (R)	483,109	34.69%		Ross Perot (RE)	139,523	10.02%	8
2000		Al Gore (D)	816,015	55.91%		George W. Bush (R)‡	561,094	38.44%		Ralph Nader (G)	64,452	4.42%	8
2004		John Kerry (D)	857,488	54.31%		George W. Bush (R)‡	693,826	43.95%		Ralph Nader (I)	12,969	0.82%	7
2008		Barack Obama (D)‡	997,773	60.59%		John McCain (R)	629,428	38.22%		Ralph Nader (I)	19162	1.16%	7
2012		Barack Obama (D)‡	905,083	58.06%		Mitt Romney (R)	634,892	40.73%		Gary Johnson (LI)	12,580	0.81%	7
2016		Hillary Clinton (D)	897,572	54.57%		Donald Trump (R)‡	673,215	40.93%		Gary Johnson (LI)	48,676	2.96%	7
2020		Joe Biden (D)‡	1,080,831	59.25%		Donald Trump (R)	715,291	39.21%		Jo Jorgensen (LI)	20,227	1.11%	7