RANKING · 2025 ESTIMATES · 64 SHOWN OF 64

Fastest growing, Colorado counties

Colorado counties ranked by population growth from the 2020 census to 2025. This list covers the 64 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

01Custer County, COCO5,590+18.8%−63.0 pts

02Elbert County, COCO30,534+17.2%−88.9 pts

03San Juan County, COCO813+15.3%+40.4 pts

04Weld County, COCO378,426+15.0%−22.2 pts

05Douglas County, COCO399,396+11.6%−179.5 pts

06Ouray County, COCO5,265+8.0%−55.0 pts

07Archuleta County, COCO14,306+7.1%−78.1 pts

08Chaffee County, COCO20,831+7.0%−21.1 pts

09Broomfield County, COCO79,174+6.8%–

10Adams County, COCO554,668+6.8%−30.5 pts

11Dolores County, COCO2,466+6.0%−16.6 pts

12Saguache County, COCO6,732+5.7%−22.4 pts

13Park County, COCO18,314+5.3%−97.1 pts

14Mineral County, COCO910+5.2%−43.7 pts

15Costilla County, COCO3,679+5.1%−9.7 pts

16Larimer County, COCO377,292+5.1%−30.0 pts

17Grand County, COCO16,496+5.0%−51.2 pts

18Mesa County, COCO162,845+4.6%−20.2 pts

19Gilpin County, COCO6,073+4.6%−50.4 pts

20Montrose County, COCO44,591+4.5%−32.4 pts

21Morgan County, COCO30,306+4.1%−19.7 pts

22El Paso County, COCO757,040+3.6%−26.6 pts

23Denver County, COCO740,613+3.5%−15.1 pts

24Montezuma County, COCO26,678+3.2%−24.4 pts

25Delta County, COCO32,178+3.1%−29.5 pts

26Gunnison County, COCO17,439+3.1%−32.8 pts

27Garfield County, COCO63,474+2.9%−43.2 pts

28Arapahoe County, COCO673,820+2.9%−21.8 pts

29Huerfano County, COCO7,011+2.8%−28.0 pts

30Rio Blanco County, COCO6,683+2.4%+2.1 pts

31La Plata County, COCO56,898+2.3%−33.8 pts

32Fremont County, COCO50,039+2.2%−40.7 pts

33Routt County, COCO25,329+2.0%−37.8 pts

34Alamosa County, COCO16,688+1.9%−8.0 pts

35Lake County, COCO7,552+1.6%−28.5 pts

36Summit County, COCO31,517+1.5%−81.3 pts

37Bent County, COCO5,716+1.2%−17.7 pts

38Conejos County, COCO7,529+0.9%−11.8 pts

39Pueblo County, COCO169,277+0.7%−14.3 pts

40Teller County, COCO24,756+0.2%−64.7 pts

41Kit Carson County, COCO7,069-0.3%−12.5 pts

42Jefferson County, COCO580,451-0.4%−20.6 pts

43Lincoln County, COCO5,645-0.5%−34.9 pts

44Boulder County, COCO328,560-0.7%−29.9 pts

45Yuma County, COCO9,896-0.9%−10.8 pts

46Prowers County, COCO11,884-1.0%−9.5 pts

47Las Animas County, COCO14,391-1.1%−11.6 pts

48Moffat County, COCO13,122-1.3%−17.4 pts

49Washington County, COCO4,732-1.8%−4.1 pts

50Cheyenne County, COCO1,713-2.0%+4.9 pts

51Kiowa County, COCO1,412-2.4%+1.6 pts

52Phillips County, COCO4,420-2.4%−9.4 pts

53Eagle County, COCO54,291-2.6%−92.6 pts

54Rio Grande County, COCO11,087-3.9%−19.2 pts

55San Miguel County, COCO7,753-4.0%−84.5 pts

56Logan County, COCO20,654-4.1%−20.8 pts

57Crowley County, COCO5,677-4.1%−44.0 pts

58Pitkin County, COCO16,625-4.2%−21.7 pts

59Clear Creek County, COCO8,994-4.3%−26.6 pts

60Hinsdale County, COCO753-4.4%−73.6 pts

61Baca County, COCO3,347-4.5%−3.7 pts

62Otero County, COCO17,683-5.4%−6.0 pts

63Sedgwick County, COCO2,247-6.5%−8.6 pts

64Jackson County, COCO1,211-12.2%−10.4 pts

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU POPULATION ESTIMATES