Party Active Inactive Total*
American Constitution 309 74 383
Approval Voting 120 5 125
Democratic 100,426 9,276 109,702
Green 692 177 869
Libertarian 2,123 561 2,684
Republican 30,380 3,679 34,059
Unity 111 18 129
Unaffiliated 96,902 12,739 109,641
Totals 231,063 26,529 257,592

Data as of 1/1/2021

Party Active Inactive Total*
American Constitution 309 55 364
Approval Voting 122 5 127
Democratic 100,205 5,535 105,740
Green 692 109 801
Libertarian 2,132 353 2,485
Republican 29,698 2,167 31,865
Unity 111 13 124
Unaffiliated 97,626 8,046 105,672
Totals 230,895 16,283 247,178

Data as of 2/1/2021

Party Active Inactive Total*
American Constitution 310 54 364
Approval Voting 123 5 128
Democratic 100,171 5,471 105,642
Green 689 109 798
Libertarian 2,136 354 2,490
Republican 29,406 2,125 31,531
Unity 110 13 123
Unaffiliated 98,135 7,989 106,124
Totals 231,080 16,120 247,200

Data as of 3/1/2021

Party Active Inactive Total*
American Constitution 311 52 363
Approval Voting 123 5 128
Democratic 100,140 5,403 105,543
Green 689 108 797
Libertarian 2,138 349 2,487
Republican 29,283 2,094 31,377
Unity 114 11 125
Unaffiliated 98,758 7,879 106,637
Totals 231,556 15,901 247,457

Data as of 4/1/2021

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The data on this page is updated monthly on the 1st of the month*.

Note that the voter counts reflected above do include a small percentage of voters who are under 18 at present, but may be eligible to vote by the next election. Colorado law allows residents to register to vote as young as 16. Only active voters who are age 18 on or before Election Day will be mailed a ballot. Note that “Approval Voting” became an official Colorado qualified political organization in September 2018. Voters could register with this organization only after this date.

To get the most up-to-date voter registration counts for active voters or to search breakdowns of active voters by city, gender, age, and party use our Voter Registration Counts tool.

Return to Maps & Data to see voter registration data from previous election years.

Definitions of Voter Status:
Active Status

Active voters automatically receive a mail ballot in each election. An active voter is:

  • Someone who is registered to vote and whose confirmation card or previous mail ballot was not returned as undeliverable.
  • Someone who is registered to vote and has not been identified as having moved to a different state.
  • Someone who has recently registered or updated their voter registration since the last general election.
Inactive Status

These voters do not automatically receive a mail ballot in each election. They are still eligible to vote by visiting a Voter Service and Polling Center during election time, or they can contact the Elections Division to find out more information about how to reactivate their record. Categories include:

  • Undeliverable Ballot or Returned Mail: Voters who no longer reside at the address provided on their voter registration file. Official election correspondence and/or ballot has been returned to the clerk’s office as “undeliverable” by the post office because the resident no longer lives at the address.
  • NCOA (National Change of Address database): Voters who have provided the U.S. Postal Service with new residence addresses that indicate they have moved out of the state of Colorado.

* This Voter Registration Data application was launched in October 2017. Data populated in earlier months in 2017 is approximately from the 1st of every month depending on whether the date fell on a weekday.