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%+598%

02Sedgwick County, COCO2,247-6.5%−408%

03Otero County, COCO17,683-5.4%−963%

04Baca County, COCO3,347-4.5%+430%

05Hinsdale County, COCO753-4.4%−106%

06Clear Creek County, COCO8,994-4.3%−119%

07Pitkin County, COCO16,625-4.2%−124%

08Crowley County, COCO5,677-4.1%−110%

09Logan County, COCO20,654-4.1%−124%

10San Miguel County, COCO7,753-4.0%−105%

11Rio Grande County, COCO11,087-3.9%−126%

12Eagle County, COCO54,291-2.6%−103%

13Phillips County, COCO4,420-2.4%−135%

14Kiowa County, COCO1,412-2.4%−40%

15Cheyenne County, COCO1,713-2.0%−71%

16Washington County, COCO4,732-1.8%−174%

17Moffat County, COCO13,122-1.3%−108%

18Las Animas County, COCO14,391-1.1%−111%

19Prowers County, COCO11,884-1.0%−111%

20Yuma County, COCO9,896-0.9%−109%

21Boulder County, COCO328,560-0.7%−102%

22Lincoln County, COCO5,645-0.5%−102%

23Jefferson County, COCO580,451-0.4%−102%

24Kit Carson County, COCO7,069-0.3%−102%

25Teller County, COCO24,756+0.2%−100%

26Pueblo County, COCO169,277+0.7%−96%

27Conejos County, COCO7,529+0.9%−93%

28Bent County, COCO5,716+1.2%−94%

29Summit County, COCO31,517+1.5%−98%

30Lake County, COCO7,552+1.6%−95%

31Alamosa County, COCO16,688+1.9%−81%

32Routt County, COCO25,329+2.0%−95%

33Fremont County, COCO50,039+2.2%−95%

34La Plata County, COCO56,898+2.3%−94%

35Rio Blanco County, COCO6,683+2.4%+906%

36Huerfano County, COCO7,011+2.8%−91%

37Arapahoe County, COCO673,820+2.9%−88%

38Garfield County, COCO63,474+2.9%−94%

39Gunnison County, COCO17,439+3.1%−91%

40Delta County, COCO32,178+3.1%−90%

41Montezuma County, COCO26,678+3.2%−88%

42Denver County, COCO740,613+3.5%−81%

43El Paso County, COCO757,040+3.6%−88%

44Morgan County, COCO30,306+4.1%−83%

45Montrose County, COCO44,591+4.5%−88%

46Gilpin County, COCO6,073+4.6%−92%

47Mesa County, COCO162,845+4.6%−82%

48Grand County, COCO16,496+5.0%−91%

49Larimer County, COCO377,292+5.1%−86%

50Costilla County, COCO3,679+5.1%−65%

51Mineral County, COCO910+5.2%−89%

52Park County, COCO18,314+5.3%−95%

53Saguache County, COCO6,732+5.7%−80%

54Dolores County, COCO2,466+6.0%−73%

55Adams County, COCO554,668+6.8%−82%

56Broomfield County, COCO79,174+6.8%–

57Chaffee County, COCO20,831+7.0%−75%

58Archuleta County, COCO14,306+7.1%−92%

59Ouray County, COCO5,265+8.0%−87%

60Douglas County, COCO399,396+11.6%−94%

61Weld County, COCO378,426+15.0%−60%

62San Juan County, COCO813+15.3%−161%

63Elbert County, COCO30,534+17.2%−84%

64Custer County, COCO5,590+18.8%−77%

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES