RANKING · 2010 CENSUS · 63 SHOWN OF 63

Fastest growing, Colorado counties · 2010

Colorado counties ranked by population growth from the 2000 census to 2010. This list covers the 63 counties in Colorado that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Douglas County, COCO399,396+62.4%−67%

02Weld County, COCO378,426+39.7%+7%

03Garfield County, COCO63,474+28.8%−38%

04Mesa County, COCO162,845+26.2%+6%

05Eagle County, COCO54,291+25.3%−72%

06San Juan County, COCO813+25.3%−201%

07Montrose County, COCO44,591+23.5%−36%

08Archuleta County, COCO14,306+22.1%−74%

09Custer County, COCO5,590+21.5%−74%

10Adams County, COCO554,668+21.4%−43%

11El Paso County, COCO757,040+20.4%−33%

12Routt County, COCO25,329+19.4%−51%

13Grand County, COCO16,496+19.3%−66%

14Larimer County, COCO377,292+19.1%−45%

15Summit County, COCO31,517+18.9%−77%

16Ouray County, COCO5,265+18.5%−71%

17Arapahoe County, COCO673,820+17.2%−30%

18La Plata County, COCO56,898+16.8%−53%

19Elbert County, COCO30,534+16.2%−85%

20Pitkin County, COCO16,625+15.3%−12%

21Gilpin County, COCO6,073+14.4%−74%

22Teller County, COCO24,756+13.6%−79%

23Pueblo County, COCO169,277+12.4%−17%

24Dolores County, COCO2,466+11.9%−47%

25San Miguel County, COCO7,753+11.6%−86%

26Park County, COCO18,314+11.6%−89%

27Rio Blanco County, COCO6,683+11.4%+4746%

28Delta County, COCO32,178+11.2%−66%

29Logan County, COCO20,654+10.8%−36%

30Gunnison County, COCO17,439+9.8%−73%

31Chaffee County, COCO20,831+9.6%−66%

32Bent County, COCO5,716+8.4%−56%

33Denver County, COCO740,613+8.2%−56%

34Montezuma County, COCO26,678+7.2%−74%

35Hinsdale County, COCO753+6.7%−90%

36Crowley County, COCO5,677+5.5%−86%

37Moffat County, COCO13,122+4.6%−71%

38Morgan County, COCO30,306+3.6%−85%

39Kit Carson County, COCO7,069+3.2%−73%

40Saguache County, COCO6,732+3.2%−89%

41Alamosa County, COCO16,688+3.2%−68%

42Yuma County, COCO9,896+2.1%−79%

43Las Animas County, COCO14,391+2.0%−81%

44Fremont County, COCO50,039+1.5%−97%

45Jefferson County, COCO580,451+1.4%−93%

46Boulder County, COCO328,560+1.1%−96%

47Phillips County, COCO4,420-0.8%−112%

48Conejos County, COCO7,529-1.7%−113%

49Washington County, COCO4,732-2.3%−196%

50Clear Creek County, COCO8,994-2.5%−111%

51Rio Grande County, COCO11,087-3.5%−123%

52Costilla County, COCO3,679-3.8%−126%

53Lake County, COCO7,552-6.4%−121%

54Otero County, COCO17,683-7.3%−1267%

55Lincoln County, COCO5,645-10.2%−130%

56Jackson County, COCO1,211-11.6%+565%

57Prowers County, COCO11,884-13.3%−257%

58Sedgwick County, COCO2,247-13.4%−732%

59Kiowa County, COCO1,412-13.8%+253%

60Mineral County, COCO910-14.3%−129%

61Huerfano County, COCO7,011-14.6%−147%

62Baca County, COCO3,347-16.1%+1785%

63Cheyenne County, COCO1,713-17.7%+156%

SHOWING 1–63 OF 63

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS