Primary Rules
How Colorado's Primary Works
Colorado uses a Semi-Open Primary system
Semi-Open Primary
Voters don't have to publicly declare a party affiliation, but they must request a specific party's ballot at the polling place.
Voter file data: L2 Data · Registration counts: Colorado Secretary of State · Updated May 4, 2026
Colorado Voter Registration
& Party Affiliation Statistics
Total Registered
3,996,931
Largest Party
Democratic (24.85%)
Independent / NPP
52.68%
Primary Type
Semi-Open Primary
At a Glance
Colorado at a Glance
Key voter registration statistics · Updated 2026
Registered Voters
3,996,931
across 64 counties
Registration Rate
83.3%
eligible population
No Party Preference
52.68%
of registered voters
2024 Turnout
73.1%
of eligible voters
Registration
Voter Registration by Party
How many registered Democrats, Republicans, and Independents are in Colorado?
Democratic24.85%
Republican22.47%
Independent/Other52.68%
| Party | Registered Voters | % of Total |
|---|---|---|
Democratic | 993,052 | 24.85% |
Republican | 898,159 | 22.47% |
Independent/Other | 2,105,720 | 52.68% |
Turnout
Voter Turnout in Colorado
How many eligible Colorado residents actually vote?
Eligible vs Registered
3,996,931 registered4,796,317 eligible
Recent Elections
| Election | Turnout | Voted |
|---|---|---|
| 2024 General | 73.1% | 3,241,120 |
| 2022 General | 58.4% | 2,540,666 |
| 2020 General | 76.7% | 3,295,666 |
| 2024 Presidential Primary | 39% | 1,558,640 |
| 2024 State Primary | 25.5% | 988,630 |
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