Colorado has reached a new milestone in voter registration: unaffiliated voters now make up more than half of the electorate.

According to data released September 1 by the Colorado Secretary of State, more than 50 percent of Colorado’s active voters are not registered Democrats or Republicans. 

That is up from 42% of the total in November 2020.

Here are the active voter registration totals by party in Colorado (as of September 1, 2025), with inactive and preregistration counts removed:

• Unaffiliated (UAF): 4,078,312

• Democratic (DEM): 2,070,960

• Republican (REP): 1,870,560

• Libertarian (LBR): 74,152

  

• No Labels (NOL): 56,570

• American Constitution (ACN): 23,568

• Green (GRN): 17,302

• Approval Voting (APV): 10,264

• Center Party (CTR): 7,504

• Unity (UNI): 6,284

• Forward (FWD): 790

Political scientists note that unaffiliated status does not necessarily indicate neutrality. Surveys suggest that about 60% of these Colorado voters lean toward Democrats, while 40% tend to favor Republicans.

Colorado utilizes semi-open presidential primaries for both president and non-presidential elections.

Registered unaffiliated voters can pick between a Republican and Democratic ballot while party members receive a primary ballot for their respective party's primary.

The Denver Post reported this week that it was a series of reforms in recent years, including automatic voter registration and opening partisan primary elections to unaffiliated voters, which has helped fuel the growth of unaffiliated voters in the state.

Colorado still trails Massachusetts and Alaska, where roughly six in ten voters are registered independent.