Party Active Inactive Total*
American Constitution 277 54 331
Democratic 96,972 6,774 103,746
Green 1,228 196 1,424
Libertarian 2,508 394 2,902
Republican 37,185 2,679 39,864
Unity 40 7 47
Unaffiliated 77,584 10,180 87,764
Totals 215,794 20,284 236,078

Data as of 1/1/2017

Party Active Inactive Total*
American Constitution 277 52 329
Democratic 96,940 6,724 103,664
Green 1,226 198 1,424
Libertarian 2,510 389 2,899
Republican 37,099 2,653 39,752
Unity 39 7 46
Unaffiliated 77,843 10,087 87,930
Totals 215,934 20,110 236,044

Data as of 2/1/2017

Party Active Inactive Total*
American Constitution 278 52 330
Democratic 96,833 6,686 103,519
Green 1,213 199 1,412
Libertarian 2,504 396 2,900
Republican 37,010 2,633 39,643
Unity 38 9 47
Unaffiliated 78,100 10,027 88,127
Totals 215,976 20,002 235,978

Data as of 3/1/2017

Party Active Inactive Total*
American Constitution 291 52 343
Democratic 96,838 6,673 103,511
Green 1,214 201 1,415
Libertarian 2,504 398 2,902
Republican 36,938 2,637 39,575
Unity 38 9 47
Unaffiliated 78,516 10,007 88,523
Totals 216,339 19,977 236,316

Data as of 4/1/2017

Party Active Inactive Total*
American Constitution 302 53 355
Democratic 96,809 6,701 103,510
Green 1,209 203 1,412
Libertarian 2,516 400 2,916
Republican 36,859 2,663 39,522
Unity 38 9 47
Unaffiliated 78,884 10,000 88,884
Totals 216,617 20,029 236,646

Data as of 5/1/2017

Party Active Inactive Total*
American Constitution 307 53 360
Democratic 96,740 6,708 103,448
Green 1,208 199 1,407
Libertarian 2,516 401 2,917
Republican 36,758 2,658 39,416
Unity 37 8 45
Unaffiliated 79,208 9,989 89,197
Totals 216,774 20,016 236,790

Data as of 6/1/2017

Party Active Inactive Total*
American Constitution 305 54 359
Democratic 96,647 6,764 103,411
Green 1,203 200 1,403
Libertarian 2,515 407 2,922
Republican 36,629 2,679 39,308
Unity 40 8 48
Unaffiliated 79,586 10,015 89,601
Totals 216,925 20,127 237,052

Data as of 7/1/2017

Party Active Inactive Total*
American Constitution 306 53 359
Democratic 96,196 6,881 103,077
Green 1,195 203 1,398
Libertarian 2,513 414 2,927
Republican 36,496 2,715 39,211
Unity 42 8 50
Unaffiliated 79,915 10,080 89,995
Totals 216,663 20,354 237,017

Data as of 8/1/2017

Party Active Inactive Total*
American Constitution 308 53 361
Democratic 96,284 6,979 103,263
Green 1,192 206 1,398
Libertarian 2,508 414 2,922
Republican 36,406 2,736 39,142
Unity 43 8 51
Unaffiliated 80,454 10,138 90,592
Totals 217,195 20,534 237,729

Data as of 9/1/2017

Party Active Inactive Total*
American Constitution 305 53 358
Democratic 96,330 7,066 103,396
Green 1,182 207 1,389
Libertarian 2,522 417 2,939
Republican 36,300 2,757 39,057
Unity 48 8 56
Unaffiliated 81,217 10,178 91,395
Totals 217,904 20,686 238,590

Data as of 10/1/2017

Party Active Inactive Total*
American Constitution 307 52 359
Democratic 96,754 6,972 103,726
Green 1,187 205 1,392
Libertarian 2,546 417 2,963
Republican 36,224 2,755 38,979
Unity 51 8 59
Unaffiliated 82,291 10,085 92,376
Totals 219,360 20,494 239,854

Data as of 11/1/2017

Party Active Inactive Total*
American Constitution 266 93 359
Democratic 89,103 14,688 103,791
Green 1,052 343 1,395
Libertarian 2,103 860 2,963
Republican 33,660 5,280 38,940
Unity 43 15 58
Unaffiliated 74,503 18,095 92,598
Totals 200,730 39,374 240,104

Data as of 12/1/2017

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.

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.