The Alaskan Independence Party is an Alaskan nationalist political party that advocates an in-state referendum which would include the option of Alaska becoming an independent country.

The American Freedom Party is a political party in the United States that promotes white nationalism. In November 2009, it filed papers to be on a ballot in California, and was launched in January 2010.

The Approval Voting Party is a single-issue American political party dedicated to implementing approval voting in the United States. In 2019, the party became recognized as a minor party in Colorado.

The Constitution Party, formerly the U.S. Taxpayers' Party until 1999, is a political party in the United States that promotes a religious conservative view of the principles and intents of the United States Constitution.

The Forward Party, also known simply as Forward, is a centrist political party in the United States. Forward has two political party affiliates at the state level that have achieved ballot access.

The Green Mountain Peace and Justice Party, known as the Liberty Union Party until 2021, is a political party active in the U.S. state of Vermont. It is a self-proclaimed "non-violent socialist party".

The Independent Party of Delaware (IPoD) is a political party in the State of Delaware. The party supports laissez-faire capitalism, limited government, and environmentalism. It was officially formed on August 29, 2000, for the stated purpose of providing Delaware voters with an alternative to the Republican and Democratic parties.

The Justice Party is a political party in the United States. It was organized in November 2011 by a group of political activists including former mayor of Salt Lake City Rocky Anderson as an alternative to what they saw as a duopoly of the two major political parties

The Liberal Party of New York is a political party in New York. Its platform supports a standard set of socially liberal policies, including abortion rights, increased spending on education, and universal health care.

The Moderate Party of Rhode Island is the third-largest contemporary political party in the U.S. state of Rhode Island, after the Democratic Party and the Republican Party.

The Oregon Progressive Party is a political party in the U.S. state of Oregon. Originally called the Oregon Peace Party, it was accepted as the sixth minor statewide political party in Oregon on August 22, 2008. This allowed the party to nominate Ralph Nader as its candidate in the 2008 U.S. presidential election.

Progressive Dane is an independent, progressive political party in Dane County, Wisconsin founded in the fall of 1992.

The Republican Party, also referred to as the GOP, is one of the two major contemporary political parties in the United States. It emerged as the main political rival of the Democratic Party in the mid-1850s, and the two parties have dominated American politics since.

The Socialist Equality Party (SEP) is a Trotskyist political party in the United States, one of several Socialist Equality parties around the world affiliated with the International Committee of the Fourth International (ICFI).

The Transhumanist Party is a political party in the United States. The party's platform is based on the ideas and principles of transhumanist politics, e.g., human enhancement, human rights, science, life extension, and technological progress.

The Unity Party of America is a national political party in the United States founded on November 4, 2004 with the slogan "Not Right, Not Left, But Forward!" The party is officially recognized by the State of Colorado and has members in 46 states.

The Workers World Party is a revolutionary Marxist–Leninist communist party founded in 1959 by a group led by Sam Marcy of the Socialist Workers Party.

The Alliance Party is a centrist American political party formed in 2019. It is affiliated with the American Party of South Carolina, Independence Party of Minnesota, Independent Party of Connecticut, and Reform Party of Florida.

The American Independent Party is a far-right political party in the United States that was established in 1967.

Communist Party USA is a Marxist–Leninist communist party in the United States which was established in 1919 after a split in the Socialist Party of America following the Russian Revolution.

The Democratic Party is one of two major contemporary political parties in the United States. Founded in 1828, it was predominantly built by Martin Van Buren, who assembled politicians in every state behind war hero Andrew Jackson, making it the world's oldest active political party.

The Freedom Socialist Party is a left-wing socialist political party with a revolutionary feminist philosophy based in the United States. It views the struggles of women and minorities as part of the struggle of the working class.

The Green Party of the United States is a federation of Green state political parties in the United States. The party promotes green politics, specifically environmentalism; nonviolence; social justice; participatory democracy; grassroots democracy; anti-war; anti-racism; libertarian socialism and eco-socialism.

The Independent Party of Florida is a political third party formed in the 1990s. It was among several parties disqualified by the Florida Secretary of State in 2017, but it successfully refiled several months later.

The Keystone Party of Pennsylvania is a third party in Pennsylvania founded in 2022 following the takeover of the Libertarian Party of Pennsylvania by the Mises Caucus.

The Libertarian Party is a political party in the United States that promotes civil liberties, non-interventionism, laissez-faire capitalism, and limiting the size and scope of government.

The People's Party is a progressive political organization in the United States aimed at "forming a major new political party free of corporate money and influence". Nick Brana formed the party after the 2016 presidential election as "Draft Bernie for a People's Party."

The Party for Socialism and Liberation is a communist party in the United States established in 2004. Its members are active in a wide range of movements including the labor, anti-war, immigrants' rights, women's rights, and anti-police brutality movements.

The Prohibition Party is a political party in the United States known for its historic opposition to the sale or consumption of alcoholic beverages and as an integral part of the temperance movement. It is the oldest existing third party in the United States and the third-longest active party.

Socialist Action is a Trotskyist political party in the United States. It publishes the monthly Socialist Action newspaper, has a youth affiliate called Youth for Socialist Action and is associated with the Fourth International.

The Socialist Party USA, officially the Socialist Party of the United States of America, is a socialist political party in the United States. The party is officially committed to multi-tendency socialism.

The United States Pirate Party (USPP) is an American political party founded in 2006 by Brent Allison and Alex English. The party's platform is aligned with the global Pirate movement, and supports reform of copyright laws to reflect open source and free culture values, government transparency, protection of privacy and civil liberties.

The Vermont Progressive Party, formerly the Progressive Coalition, is a progressive political party in the United States founded in 1999 and active only in the state of Vermont.

The Working Class Party is a left-wing, political party, based in Detroit, Michigan, United States. The Working Class Party competed in the 2016 Michigan election, presenting three candidates.

The Aloha ʻĀina Party is a political party in Hawaiʻi that advocates for the sovereignty of Hawaiʻi and the promotion of Hawaiian cultural values.

The American Solidarity Party is a Christian-democratic political party in the United States. It was founded in 2011 and officially incorporated in 2016. The party has a Solidarity National Committee and has numerous active state and local chapters.

The Conservative Party of New York State is an American political party founded in 1962 following conservative dissatisfaction with the Republican Party in New York. The party is known for its strategy of attempting to influence the Republican Party in a more conservative direction.

The Ecology Party of Florida is a minor environmental political party in the United States state of Florida. Founded as a front group to support Ralph Nader's 2008 presidential candidacy, it has remained minimally active in the years since that election.

The Grassroots—Legalize Cannabis Party is a political third party in the U.S. state of Minnesota created by Oliver Steinberg in 2014 to oppose cannabis prohibition. G—LC Is a democratic socialist party with a background branching from the Grassroots Party established in 1986.

The Green Party of Rhode Island is one of the oldest active Green parties in the United States. The party was founded on March 6, 1992, at a meeting of 40 activists from Rhode Island.

The Independent Party of Oregon is a centrist political party in the U.S. state of Oregon with more than 140,000 registrants since its inception in January 2007.

The Legal Marijuana Now Party is a political third party in the United States. The party's platform includes abolishing the Drug Enforcement Administration and legalizing hemp and marijuana.

The Libertarian Party of New Mexico is a libertarian political party in New Mexico. It was affiliated with the national Libertarian Party from its founding until 2022, and is now affiliated with the Association of Liberty State Parties.

The Natural Law Party (NLP) is a political party in Michigan. It was a national political party in the United States affiliated with the international Natural Law Party. It was founded in 1992. Beginning in 2004, many of its state chapters dissolved.

The Peace and Freedom Party is a left-wing political party with affiliates and former members in more than a dozen American states, including California, Colorado, Florida, Hawaii, Indiana and Utah, but none now have ballot status besides California.

The Reform Party of the United States of America, generally known as the Reform Party USA or the Reform Party, is a centrist political party in the United States, founded in 1995 by Ross Perot.

Socialist Alternative (sometimes shortened to SA or SAlt, and founded as Labor Militant) is a Trotskyist political party in the United States. It describes itself as a Marxist organization, and a revolutionary party fighting for a democratic socialist economy.

The Socialist Workers Party (SWP) is a Trotskyist party in the United States. Originally a group in the Communist Party USA that supported Leon Trotsky against Soviet leader Joseph Stalin, it places a priority on "solidarity work" to aid strikes and is strongly supportive of Cuba. The SWP publishes The Militant, a weekly newspaper that dates back to 1928.

The United Utah Party (UUP) is a centrist political party in the United States. It was founded in 2017 and is active only in the state of Utah. The party identifies itself as politically moderate, and was created out of frustration with the Republican and Democratic parties.

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The Working Families Party (WFP) is a left-wing minor political party in the United States, founded in New York in 1998.