Where to vote: Colorado voter lookup (state election office).
Registered voters, 2008-2024
EAVS counts, every two years. Colorado Secretary of State, November 1, 2026: 4,081,390.
Survey estimate: reported registration, 1978-2024
Current Population Survey: adults who said they were registered.
Party registration, November 1, 2026
Active registered voters by party, from the Colorado Secretary of State.
| County | Democrats | Republicans | Unaffiliated | Other | Total | Margin |
|---|---|---|---|---|---|---|
| Adams | 90,041 | 57,916 | 171,759 | 10,151 | 329,867 | D+9.7 |
| Alamosa | 2,587 | 2,632 | 4,894 | 260 | 10,373 | R+0.4 |
| Arapahoe | 120,811 | 78,703 | 218,753 | 11,101 | 429,368 | D+9.8 |
| Archuleta | 1,795 | 3,871 | 5,870 | 240 | 11,776 | R+17.6 |
| Baca | 245 | 1,253 | 1,021 | 38 | 2,557 | R+39.4 |
| Bent | 490 | 1,029 | 1,325 | 76 | 2,920 | R+18.5 |
| Boulder | 88,180 | 22,555 | 117,625 | 4,561 | 232,921 | D+28.2 |
| Broomfield | 15,389 | 9,909 | 31,165 | 1,174 | 57,637 | D+9.5 |
| Chaffee | 4,015 | 3,939 | 8,980 | 346 | 17,280 | D+0.4 |
| Cheyenne | 84 | 726 | 433 | 10 | 1,253 | R+51.2 |
| Clear Creek | 1,807 | 1,472 | 3,958 | 195 | 7,432 | D+4.5 |
| Conejos | 1,746 | 1,827 | 1,720 | 73 | 5,366 | R+1.5 |
| Costilla | 1,358 | 452 | 1,180 | 70 | 3,060 | D+29.6 |
| Crowley | 296 | 944 | 905 | 42 | 2,187 | R+29.6 |
| Custer | 410 | 1,972 | 2,135 | 97 | 4,614 | R+33.9 |
| Delta | 2,753 | 9,416 | 11,377 | 546 | 24,092 | R+27.7 |
| Denver | 186,653 | 39,392 | 234,852 | 12,386 | 473,283 | D+31.1 |
| Dolores | 176 | 764 | 770 | 24 | 1,734 | R+33.9 |
| Douglas | 48,697 | 89,107 | 149,075 | 5,568 | 292,447 | R+13.8 |
| Eagle | 8,754 | 5,992 | 19,971 | 802 | 35,519 | D+7.8 |
| El Paso | 83,354 | 139,916 | 270,521 | 14,257 | 508,048 | R+11.1 |
| Elbert | 2,094 | 11,190 | 11,160 | 505 | 24,949 | R+36.5 |
| Fremont | 3,949 | 12,084 | 15,226 | 723 | 31,982 | R+25.4 |
| Garfield | 7,921 | 9,311 | 21,175 | 972 | 39,379 | R+3.5 |
| Gilpin | 1,155 | 988 | 2,648 | 130 | 4,921 | D+3.4 |
| Grand | 2,271 | 3,520 | 6,423 | 235 | 12,449 | R+10.0 |
| Gunnison | 3,228 | 2,214 | 7,161 | 273 | 12,876 | D+7.9 |
| Hinsdale | 65 | 292 | 311 | 10 | 678 | R+33.5 |
| Huerfano | 1,466 | 1,335 | 2,679 | 137 | 5,617 | D+2.3 |
| Jackson | 37 | 560 | 329 | 14 | 940 | R+55.6 |
| Jefferson | 114,792 | 86,037 | 222,725 | 10,039 | 433,593 | D+6.6 |
| Kiowa | 58 | 564 | 356 | 7 | 985 | R+51.4 |
| Kit Carson | 361 | 2,489 | 1,741 | 82 | 4,673 | R+45.5 |
| La Plata | 10,095 | 9,220 | 24,002 | 954 | 44,271 | D+2.0 |
| Lake | 1,518 | 776 | 2,867 | 162 | 5,323 | D+13.9 |
| Larimer | 65,357 | 58,779 | 142,858 | 6,457 | 273,451 | D+2.4 |
| Las Animas | 2,780 | 2,506 | 5,002 | 247 | 10,535 | D+2.6 |
| Lincoln | 250 | 1,564 | 1,197 | 66 | 3,077 | R+42.7 |
| Logan | 1,149 | 5,805 | 5,099 | 241 | 12,294 | R+37.9 |
| Mesa | 14,732 | 40,316 | 58,240 | 3,153 | 116,441 | R+22.0 |
| Mineral | 173 | 273 | 377 | 13 | 836 | R+12.0 |
| Moffat | 592 | 3,956 | 4,275 | 210 | 9,033 | R+37.2 |
| Montezuma | 2,931 | 7,147 | 9,533 | 486 | 20,097 | R+21.0 |
| Montrose | 3,803 | 11,953 | 15,453 | 668 | 31,877 | R+25.6 |
| Morgan | 2,529 | 6,758 | 8,859 | 514 | 18,660 | R+22.7 |
| Otero | 2,664 | 3,990 | 5,360 | 300 | 12,314 | R+10.8 |
| Ouray | 993 | 1,016 | 2,598 | 86 | 4,693 | R+0.5 |
| Park | 2,308 | 4,608 | 7,495 | 427 | 14,838 | R+15.5 |
| Phillips | 264 | 1,449 | 1,086 | 45 | 2,844 | R+41.7 |
| Pitkin | 4,314 | 1,594 | 7,313 | 306 | 13,527 | D+20.1 |
| Prowers | 974 | 2,828 | 3,083 | 170 | 7,055 | R+26.3 |
| Pueblo | 33,695 | 25,996 | 53,248 | 3,079 | 116,018 | D+6.6 |
| Rio Blanco | 187 | 2,530 | 1,701 | 69 | 4,487 | R+52.2 |
| Rio Grande | 1,692 | 2,600 | 3,800 | 167 | 8,259 | R+11.0 |
| Routt | 4,981 | 3,563 | 10,951 | 446 | 19,941 | D+7.1 |
| Saguache | 1,333 | 878 | 2,358 | 138 | 4,707 | D+9.7 |
| San Juan | 162 | 97 | 468 | 20 | 747 | D+8.7 |
| San Miguel | 1,963 | 707 | 3,149 | 141 | 5,960 | D+21.1 |
| Sedgwick | 172 | 831 | 655 | 30 | 1,688 | R+39.0 |
| Summit | 5,866 | 2,981 | 12,362 | 530 | 21,739 | D+13.3 |
| Teller | 2,245 | 7,530 | 9,302 | 545 | 19,622 | R+26.9 |
| Washington | 173 | 2,040 | 1,048 | 47 | 3,308 | R+56.4 |
| Weld | 41,997 | 71,203 | 121,205 | 6,694 | 241,099 | R+12.1 |
| Yuma | 453 | 2,893 | 2,434 | 93 | 5,873 | R+41.5 |
| Total | 1,009,383 | 892,758 | 2,077,601 | 101,648 | 4,081,390 | D+2.9 |
By county, 2024
EAVS 2024 by county-equivalent; citizens 18+ from the Census Bureau's 2020-2024 estimate.
| County | Registered | Active | Inactive | Citizens 18+ | Active, % of citizens 18+ |
|---|---|---|---|---|---|
| Adams County | 356,527 | 322,636 | 33,891 | 349,497 | 92.3% |
| Alamosa County | 11,893 | 10,423 | 1,470 | 12,111 | 86.1% |
| Arapahoe County | 482,362 | 429,655 | 52,707 | 462,316 | 92.9% |
| Archuleta County | 13,578 | 11,787 | 1,791 | 11,220 | 105.1%* |
| Baca County | 2,874 | 2,588 | 286 | 2,564 | 100.9%* |
| Bent County | 3,483 | 2,998 | 485 | 4,544 | 66.0% |
| Boulder County | 262,877 | 235,603 | 27,274 | 256,367 | 91.9% |
| Broomfield County | 62,801 | 56,152 | 6,649 | 57,261 | 98.1% |
| Chaffee County | 19,042 | 17,009 | 2,033 | 17,092 | 99.5% |
| Cheyenne County | 1,379 | 1,253 | 126 | 1,318 | 95.1% |
| Clear Creek County | 8,636 | 7,609 | 1,027 | 7,855 | 96.9% |
| Conejos County | 5,901 | 5,396 | 505 | 5,490 | 98.3% |
| Costilla County | 3,450 | 2,976 | 474 | 2,815 | 105.7%* |
| Crowley County | 2,543 | 2,273 | 270 | 4,848 | 46.9% |
| Custer County | 5,178 | 4,673 | 505 | 4,473 | 104.5%* |
| Delta County | 26,228 | 24,211 | 2,017 | 25,198 | 96.1% |
| Denver County | 561,253 | 479,804 | 81,449 | 537,962 | 89.2% |
| Dolores County | 1,842 | 1,732 | 110 | 2,079 | 83.3% |
| Douglas County | 315,901 | 289,874 | 26,027 | 276,823 | 104.7%* |
| Eagle County | 40,072 | 35,708 | 4,364 | 39,107 | 91.3% |
| El Paso County | 587,655 | 503,029 | 84,626 | 550,470 | 91.4% |
| Elbert County | 26,254 | 24,009 | 2,245 | 21,701 | 110.6%* |
| Fremont County | 35,686 | 32,262 | 3,424 | 41,125 | 78.4% |
| Garfield County | 43,462 | 39,101 | 4,361 | 42,186 | 92.7% |
| Gilpin County | 5,858 | 5,038 | 820 | 4,874 | 103.4%* |
| Grand County | 13,926 | 12,358 | 1,568 | 12,937 | 95.5% |
| Gunnison County | 15,123 | 13,030 | 2,093 | 14,355 | 90.8% |
| Hinsdale County | 750 | 693 | 57 | 819 | 84.6% |
| Huerfano County | 6,440 | 5,700 | 740 | 5,873 | 97.1% |
| Jackson County | 1,196 | 1,022 | 174 | 1,138 | 89.8% |
| Jefferson County | 480,149 | 438,530 | 41,619 | 457,787 | 95.8% |
| Kiowa County | 1,115 | 1,008 | 107 | 1,039 | 97.0% |
| Kit Carson County | 5,289 | 4,764 | 525 | 4,962 | 96.0% |
| La Plata County | 52,091 | 44,223 | 7,868 | 45,783 | 96.6% |
| Lake County | 6,392 | 5,284 | 1,108 | 5,361 | 98.6% |
| Larimer County | 304,750 | 273,109 | 31,641 | 290,877 | 93.9% |
| Las Animas County | 12,701 | 10,673 | 2,028 | 11,520 | 92.6% |
| Lincoln County | 3,693 | 3,211 | 482 | 4,476 | 71.7% |
| Logan County | 14,043 | 12,721 | 1,322 | 16,636 | 76.5% |
| Mesa County | 129,585 | 116,224 | 13,361 | 122,803 | 94.6% |
| Mineral County | 1,004 | 864 | 140 | 643 | 134.4%* |
| Moffat County | 10,272 | 9,030 | 1,242 | 9,631 | 93.8% |
| Montezuma County | 22,627 | 20,051 | 2,576 | 20,630 | 97.2% |
| Montrose County | 34,857 | 31,683 | 3,174 | 33,330 | 95.1% |
| Morgan County | 20,373 | 18,684 | 1,689 | 20,047 | 93.2% |
| Otero County | 13,914 | 12,468 | 1,446 | 13,679 | 91.1% |
| Ouray County | 5,193 | 4,762 | 431 | 4,354 | 109.4%* |
| Park County | 17,068 | 15,004 | 2,064 | 15,196 | 98.7% |
| Phillips County | 3,160 | 2,880 | 280 | 3,037 | 94.8% |
| Pitkin County | 15,604 | 14,044 | 1,560 | 13,815 | 101.7%* |
| Prowers County | 7,982 | 7,199 | 783 | 8,367 | 86.0% |
| Pueblo County | 128,315 | 116,465 | 11,850 | 128,424 | 90.7% |
| Rio Blanco County | 5,182 | 4,522 | 660 | 4,730 | 95.6% |
| Rio Grande County | 9,556 | 8,197 | 1,359 | 8,681 | 94.4% |
| Routt County | 22,738 | 20,147 | 2,591 | 20,045 | 100.5%* |
| Saguache County | 5,254 | 4,655 | 599 | 5,232 | 89.0% |
| San Juan County | 828 | 740 | 88 | 577 | 128.2%* |
| San Miguel County | 6,840 | 6,189 | 651 | 6,300 | 98.2% |
| Sedgwick County | 1,924 | 1,700 | 224 | 1,738 | 97.8% |
| Summit County | 25,666 | 22,161 | 3,505 | 24,413 | 90.8% |
| Teller County | 22,912 | 19,874 | 3,038 | 20,784 | 95.6% |
| Washington County | 3,663 | 3,339 | 324 | 3,658 | 91.3% |
| Weld County | 258,022 | 233,722 | 24,300 | 244,018 | 95.8% |
| Yuma County | 6,348 | 5,883 | 465 | 6,200 | 94.9% |
* Active registered voters exceed the Census estimate of citizens 18+: list maintenance or CVAP margin.
About these figures
Counts are what state election offices report to the US Election Assistance Commission (EAVS) after each November election; questions and state practice change between years. The share is active voters over the Census Bureau's citizen voting-age population estimate (CVAP). The survey line is self-reported (Current Population Survey) and kept separate from the office counts.
Party figures are the state office's own latest report, read directly from its published file.
The AVR mark is the year automatic voter registration began in Colorado, from the Brennan Center's list.
Sources
Registration counts: US Election Assistance Commission, Election Administration and Voting Survey 2008-2024 (public domain).
Citizen voting-age population: US Census Bureau, CVAP special tabulation, 2020-2024 ACS (public domain). Survey estimate: US Census Bureau, Current Population Survey voting and registration tables A-5b and A-3b (public domain).
Party registration: Colorado Secretary of State, November 1, 2026.
PollCheck US. Data through November 5, 2026. Photo credits