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%−128.6 pts

02Weld County, COCO378,426+39.7%+2.5 pts

03Garfield County, COCO63,474+28.8%−17.3 pts

04Mesa County, COCO162,845+26.2%+1.4 pts

05Eagle County, COCO54,291+25.3%−64.7 pts

06San Juan County, COCO813+25.3%+50.4 pts

07Montrose County, COCO44,591+23.5%−13.4 pts

08Archuleta County, COCO14,306+22.1%−63.1 pts

09Custer County, COCO5,590+21.5%−60.4 pts

10Adams County, COCO554,668+21.4%−15.9 pts

11El Paso County, COCO757,040+20.4%−9.8 pts

12Routt County, COCO25,329+19.4%−20.4 pts

13Grand County, COCO16,496+19.3%−36.9 pts

14Larimer County, COCO377,292+19.1%−16.0 pts

15Summit County, COCO31,517+18.9%−63.9 pts

16Ouray County, COCO5,265+18.5%−44.5 pts

17Arapahoe County, COCO673,820+17.2%−7.4 pts

18La Plata County, COCO56,898+16.8%−19.3 pts

19Elbert County, COCO30,534+16.2%−89.8 pts

20Pitkin County, COCO16,625+15.3%−2.2 pts

21Gilpin County, COCO6,073+14.4%−40.6 pts

22Teller County, COCO24,756+13.6%−51.3 pts

23Pueblo County, COCO169,277+12.4%−2.5 pts

24Dolores County, COCO2,466+11.9%−10.7 pts

25San Miguel County, COCO7,753+11.6%−68.9 pts

26Park County, COCO18,314+11.6%−90.9 pts

27Rio Blanco County, COCO6,683+11.4%+11.1 pts

28Delta County, COCO32,178+11.2%−21.5 pts

29Logan County, COCO20,654+10.8%−6.0 pts

30Gunnison County, COCO17,439+9.8%−26.0 pts

31Chaffee County, COCO20,831+9.6%−18.4 pts

32Bent County, COCO5,716+8.4%−10.5 pts

33Denver County, COCO740,613+8.2%−10.4 pts

34Montezuma County, COCO26,678+7.2%−20.5 pts

35Hinsdale County, COCO753+6.7%−62.5 pts

36Crowley County, COCO5,677+5.5%−34.3 pts

37Moffat County, COCO13,122+4.6%−11.5 pts

38Morgan County, COCO30,306+3.6%−20.2 pts

39Kit Carson County, COCO7,069+3.2%−9.0 pts

40Saguache County, COCO6,732+3.2%−24.9 pts

41Alamosa County, COCO16,688+3.2%−6.7 pts

42Yuma County, COCO9,896+2.1%−7.9 pts

43Las Animas County, COCO14,391+2.0%−8.5 pts

44Fremont County, COCO50,039+1.5%−41.5 pts

45Jefferson County, COCO580,451+1.4%−18.8 pts

46Boulder County, COCO328,560+1.1%−28.1 pts

47Phillips County, COCO4,420-0.8%−7.8 pts

48Conejos County, COCO7,529-1.7%−14.4 pts

49Washington County, COCO4,732-2.3%−4.6 pts

50Clear Creek County, COCO8,994-2.5%−24.9 pts

51Rio Grande County, COCO11,087-3.5%−18.7 pts

52Costilla County, COCO3,679-3.8%−18.6 pts

53Lake County, COCO7,552-6.4%−36.5 pts

54Otero County, COCO17,683-7.3%−7.9 pts

55Lincoln County, COCO5,645-10.2%−44.6 pts

56Jackson County, COCO1,211-11.6%−9.9 pts

57Prowers County, COCO11,884-13.3%−21.9 pts

58Sedgwick County, COCO2,247-13.4%−15.5 pts

59Kiowa County, COCO1,412-13.8%−9.9 pts

60Mineral County, COCO910-14.3%−63.2 pts

61Huerfano County, COCO7,011-14.6%−45.5 pts

62Baca County, COCO3,347-16.1%−15.3 pts

63Cheyenne County, COCO1,713-17.7%−10.8 pts

SHOWING 1–63 OF 63

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU DECENNIAL CENSUS