RANKING · 2025 ESTIMATES · 64 SHOWN OF 64

Fastest shrinking, Colorado counties

Colorado counties with the steepest population decline 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 growing Most population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Jackson County, COCO1,211-12.2%−10.4 pts

02Sedgwick County, COCO2,247-6.5%−8.6 pts

03Otero County, COCO17,683-5.4%−6.0 pts

04Baca County, COCO3,347-4.5%−3.7 pts

05Hinsdale County, COCO753-4.4%−73.6 pts

06Clear Creek County, COCO8,994-4.3%−26.6 pts

07Pitkin County, COCO16,625-4.2%−21.7 pts

08Crowley County, COCO5,677-4.1%−44.0 pts

09Logan County, COCO20,654-4.1%−20.8 pts

10San Miguel County, COCO7,753-4.0%−84.5 pts

11Rio Grande County, COCO11,087-3.9%−19.2 pts

12Eagle County, COCO54,291-2.6%−92.6 pts

13Phillips County, COCO4,420-2.4%−9.4 pts

14Kiowa County, COCO1,412-2.4%+1.6 pts

15Cheyenne County, COCO1,713-2.0%+4.9 pts

16Washington County, COCO4,732-1.8%−4.1 pts

17Moffat County, COCO13,122-1.3%−17.4 pts

18Las Animas County, COCO14,391-1.1%−11.6 pts

19Prowers County, COCO11,884-1.0%−9.5 pts

20Yuma County, COCO9,896-0.9%−10.8 pts

21Boulder County, COCO328,560-0.7%−29.9 pts

22Lincoln County, COCO5,645-0.5%−34.9 pts

23Jefferson County, COCO580,451-0.4%−20.6 pts

24Kit Carson County, COCO7,069-0.3%−12.5 pts

25Teller County, COCO24,756+0.2%−64.7 pts

26Pueblo County, COCO169,277+0.7%−14.3 pts

27Conejos County, COCO7,529+0.9%−11.8 pts

28Bent County, COCO5,716+1.2%−17.7 pts

29Summit County, COCO31,517+1.5%−81.3 pts

30Lake County, COCO7,552+1.6%−28.5 pts

31Alamosa County, COCO16,688+1.9%−8.0 pts

32Routt County, COCO25,329+2.0%−37.8 pts

33Fremont County, COCO50,039+2.2%−40.7 pts

34La Plata County, COCO56,898+2.3%−33.8 pts

35Rio Blanco County, COCO6,683+2.4%+2.1 pts

36Huerfano County, COCO7,011+2.8%−28.0 pts

37Arapahoe County, COCO673,820+2.9%−21.8 pts

38Garfield County, COCO63,474+2.9%−43.2 pts

39Gunnison County, COCO17,439+3.1%−32.8 pts

40Delta County, COCO32,178+3.1%−29.5 pts

41Montezuma County, COCO26,678+3.2%−24.4 pts

42Denver County, COCO740,613+3.5%−15.1 pts

43El Paso County, COCO757,040+3.6%−26.6 pts

44Morgan County, COCO30,306+4.1%−19.7 pts

45Montrose County, COCO44,591+4.5%−32.4 pts

46Gilpin County, COCO6,073+4.6%−50.4 pts

47Mesa County, COCO162,845+4.6%−20.2 pts

48Grand County, COCO16,496+5.0%−51.2 pts

49Larimer County, COCO377,292+5.1%−30.0 pts

50Costilla County, COCO3,679+5.1%−9.7 pts

51Mineral County, COCO910+5.2%−43.7 pts

52Park County, COCO18,314+5.3%−97.1 pts

53Saguache County, COCO6,732+5.7%−22.4 pts

54Dolores County, COCO2,466+6.0%−16.6 pts

55Adams County, COCO554,668+6.8%−30.5 pts

56Broomfield County, COCO79,174+6.8%–

57Chaffee County, COCO20,831+7.0%−21.1 pts

58Archuleta County, COCO14,306+7.1%−78.1 pts

59Ouray County, COCO5,265+8.0%−55.0 pts

60Douglas County, COCO399,396+11.6%−179.5 pts

61Weld County, COCO378,426+15.0%−22.2 pts

62San Juan County, COCO813+15.3%+40.4 pts

63Elbert County, COCO30,534+17.2%−88.9 pts

64Custer County, COCO5,590+18.8%−63.0 pts

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