Each state has their own process for voter registration. Some states require voters to register with a political party. Others do not.
The voter registration statistics below are a best estimate of voter political party affiliations based on available data, including voter participation in party primaries.
L2 Data is IVN's data provider and a national leader in nonpartisan data. For an explanation of L2's state-specific partisan breakdown estimates, CLICK HERE.
Voter registration data provided by and in collaboration with L2 Data, a trusted provider of nonpartisan voter data.
For an explanation of L2's state-specific partisan breakdown estimates, CLICK HERE.
Percentages are rounded to the nearest hundredth decimal.
Last Updated: August 8, 2025.
Voters do not officially register with a political party.
Democratic, Republican
Democratic, Independence, Libertarian, Republican
Democratic, Libertarian, Republican
Voters do not officially register with a political party.
None currently underway.
Constitution, Democratic, Green, Libertarian Republican
Democratic, Green, American Independent, Libertarian, Peace & Freedom, Republican
Democratic, Republican
None currently underway.
Democratic, Republican
None currently underway.
Democratic, Republican
None found.
None currently underway.
Green, Democratic, Libertarian, Republican
None found.
Democratic, Republican
Voters do not register with a political party.
None currently underway.
Democratic, Republican
Voters do not register with a political party.
The Supreme Court rejected an attempt by the Democratic party to close their currently open primaries.
None found.
None found.
None currently underway.
Democratic, Republican
None found.
Voters do not register with a political party.
None currently underway.
Democratic, Republican
Voters do not register by political party.
None currently underway.
Democratic, Republican
None found.
None currently underway.
Democratic, Libertarian, Republican
None found.
None currently underway.
Democratic, Libertarian, Republican
None currently underway.
Democratic, Independent, Republican
None currently underway.
Democratic, Republican
None found.
Democratic, Green, Republican
Benisek v Lamone - Challenging the congressional redistricting plan enacted by the Maryland General Assembly following the 2010 Census.
Democratic, Green, Libertarian, Republican
Democratic, Libertarian, Republican
Voters do not register with a political party.
Litigation pending. The ACLU filed a challenge on Nov. 2 to Massachusetts’s law that requires voters to register 20 days before an election.
Democratic, Green, Libertarian, Natural Law, Republican, U.S. Taxpayer’s
Voters do not officially register with a political party.
None currently underway.
Democratic, Democratic Farmer-Labor Party, Republican
Voters do not register with a political party.
None currently underway.
Democratic, Republican
None found.
Voters do not officially register with a political party.
None currently underway.
Constitution, Democratic, Green, Libertarian, Republican
Voters do not officially register with a political party.
None currently underway.
Constitution, Libertarian, Republican
None currently underway.
Constitution, Libertarian, Republican
None currently underway.
Democratic, Republican
None currently underway.
Democratic, Republican
None currently underway.
Conservative, Constitution, Democratic, Green, Libertarian, Natural Law, Reform Party, Republican, Socialist
None currently underway.
Democratic, Republican, Libertarian
None currently underway.
Democratic, Republican
None currently underway.
Democratic, Libertarian, Republican
Voters do not officially register with a political party.
None currently underway.
Democratic, Republican, Libertarian
None found.
Voters do not officially register with a political party.
None currently underway.
Democratic, Republican
None currently underway.
Democratic, Libertarian, Republican
Democratic, Republican, Independent Party
League of Women Voters Pennsylvania et al. v. Commonwealth of Pennsylvania - Lawsuit claiming Pennsylvania's districts as drawn violate the constitution’s prohibition of partisan gerrymandering
Democratic, Republican
None currently underway.
Democratic, Republican
None currently underway.
Democratic, Green, Independence, Labor, Libertarian, Republican, United Citizens, Working Families
None found.
None currently underway.
Constitution, Democratic, Libertarian, Republican
Voters do not officially register with a political party.
None currently underway.
Democratic, Republican
Texas voters do not register by party. However, when those voters participate in a partisan primary, that ballot choice is recorded and reported on the state voter file. In the absence of stronger indications (e.g. partisan political contributions or identification due to the holding of partisan public office) the most recent even-year partisan primary ballot is used. Texas reports participation in presidential preference primaries in which large percentages vote, particularly in the Republican races. In the absence of any even-year partisan primary participation, the most recent odd-year local partisan primary is used. This information is supplemented through the use of modeling analytics. Likely race in major urban areas plays a major role in that modeling.
None currently underway.
Democratic, Republican
None currently underway.
Constitution, Democratic, Independent American, Libertarian, and Republican
None found.
Voters do not officially register with a political party.
None currently underway.
Democratic, Progressive, Republican
None found.
Voters do not officially register with a political party.
None currently underway.
Democratic, Republican
Voters do not officially register with a political party.
None currently underway.
Washington does not have major party status.
None currently underway.
Democratic, Republican
Voters do not officially register with a political party.
Gill v. Whitford - Partisan gerrymandering case awaiting oral argument before SCOTUS
Democratic, Republican
None currently underway.
Democratic, Republican
None found.