Largest Counties in Colorado

There are a total of 64 counties or county equivalents in the U.S. state of Colorado. Among them, the five biggest counties by population are El Paso, Denver, Arapahoe, Jefferson, and Adams. In the following table, you will see the list of all counties in Colorado, each with population, land area, density and the time of establishment.

Rank County Population County Seat Established Area (km2) Density
1 El Paso County 622,252 Colorado Springs 1861 5,513 112.87
2 City and County of Denver 600,147 Denver 1902 403 1,489.20
3 Arapahoe County 571,992 Littleton 1861 2,083 274.6
4 Jefferson County 534,532 Golden 1861 2,002 267
5 Adams County 441,592 Brighton 1902 3,062 144.22
6 Larimer County 299,619 Fort Collins 1861 6,816 43.96
7 Boulder County 294,556 Boulder 1861 1,918 153.57
8 Douglas County 285,454 Castle Rock 1861 2,182 130.82
9 Weld County 252,814 Greeley 1861 10,396 24.32
10 Pueblo County 159,052 Pueblo 1861 6,208 25.62
11 Mesa County 146,712 Grand Junction 1883 8,665 16.93
12 Garfield County 56,378 Glenwood Springs 1883 7,662 7.36
13 City and County of Broomfield 55,878 Broomfield 2001 87 642.28
14 Eagle County 52,186 Englewood 1883 4,405 11.85
15 La Plata County 51,323 Durango 1874 4,404 11.65
16 Fremont County 46,813 Canon City 1861 3,971 11.79
17 Montrose County 41,265 Montrose 1883 5,818 7.09
18 Delta County 30,941 Delta 1883 2,977 10.39
19 Morgan County 28,148 Fort Morgan 1889 3,351 8.4
20 Summit County 27,983 Breckenridge 1861 1,603 17.46
21 Montezuma County 25,524 Cortez 1889 5,273 4.84
22 Routt County 23,498 Steamboat Springs 1877 6,118 3.84
23 Teller County 23,339 Cripple Creek 1899 1,447 16.13
24 Elbert County 23,075 Kiowa 1874 4,789 4.82
25 Logan County 22,698 Sterling 1887 4,779 4.75
26 Otero County 18,820 La Junta 1889 3,283 5.73
27 Chaffee County 17,798 Salida 1879 2,627 6.78
28 Pitkin County 17,137 Aspen 1881 2,513 6.82
29 Park County 16,195 Fairplay 1861 5,722 2.83
30 Las Animas County 15,496 Trinidad 1866 12,363 1.25
31 Alamosa County 15,434 Alamosa 1913 1,873 8.24
32 Gunnison County 15,313 Gunnison 1877 8,441 1.81
33 Grand County 14,832 Hot Sulphur Springs 1874 4,839 3.07
34 Moffat County 13,784 Craig 1911 12,318 1.12
35 Prowers County 12,540 Lamar 1889 4,261 2.94
36 Archuleta County 12,073 Pagosa Springs 1885 3,508 3.44
37 Rio Grande County 11,971 Del Norte 1874 2,365 5.06
38 Yuma County 10,032 Wray 1889 6,137 1.63
39 Clear Creek County 9,077 Georgetown 1861 1,027 8.84
40 Kit Carson County 8,259 Burlington 1889 5,601 1.47
41 Conejos County 8,245 Conejos 1861 3,342 2.47
42 San Miguel County 7,348 Telluride 1883 3,343 2.2
43 Lake County 7,299 Leadville 1861 993 7.35
44 Huerfano County 6,700 Walsenburg 1861 4,124 1.62
45 Rio Blanco County 6,655 Meeker 1889 8,356 0.8
46 Bent County 6,488 Las Animas 1870 3,991 1.63
47 Saguache County 6,097 Saguache 1866 8,206 0.74
48 Crowley County 5,812 Ordway 1911 2,073 2.8
49 Lincoln County 5,456 Hugo 1889 6,696 0.81
50 Gilpin County 5,430 Central City 1861 389 13.96
51 Washington County 4,803 Akron 1887 6,534 0.74
52 Phillips County 4,431 Holyoke 1889 1,783 2.49
53 Ouray County 4,425 Ouray 1877 1,405 3.15
54 Custer County 4,244 Westcliffe 1877 1,915 2.22
55 Baca County 3,777 Springfield 1889 6,626 0.57
56 Costilla County 3,513 San Luis 1861 3,184 1.1
57 Sedgwick County 2,368 Julesburg 1889 1,421 1.67
58 Dolores County 2,053 Dove Creek 1881 2,789 0.74
59 Cheyenne County 1,825 Cheyenne Wells 1889 4,615 0.4
60 Kiowa County 1,387 Eads 1889 4,625 0.3
61 Jackson County 1,383 Walden 1909 4,195 0.33
62 Hinsdale County 832 Lake City 1874 2,909 0.29
63 Mineral County 701 Creede 1893 2,274 0.31
64 San Juan County 688 Silverton 1876 1,007 0.68

Largest Counties in Colorado

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