RANKING · 2020 CENSUS · 64 SHOWN OF 64

Fastest shrinking, Colorado counties · 2020

Colorado counties with the steepest population decline from the 2010 census to 2020. 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

01Kit Carson County, COCO7,069-14.3%−26.5 pts

02Bent County, COCO5,716-13.1%−31.9 pts

03Conejos County, COCO7,529-9.6%−22.3 pts

04Baca County, COCO3,347-7.4%−6.6 pts

05Hinsdale County, COCO753-6.5%−75.7 pts

06Las Animas County, COCO14,391-6.1%−16.6 pts

07Logan County, COCO20,654-5.2%−21.9 pts

08Cheyenne County, COCO1,713-4.8%+2.1 pts

09Prowers County, COCO11,884-4.4%−12.9 pts

10Rio Grande County, COCO11,087-3.7%−19.0 pts

11Moffat County, COCO13,122-3.6%−19.7 pts

12Rio Blanco County, COCO6,683-2.1%−2.3 pts

13Jackson County, COCO1,211-1.1%+0.7 pts

14Otero County, COCO17,683-0.7%−1.4 pts

15Costilla County, COCO3,679-0.7%−15.5 pts

16Yuma County, COCO9,896-0.5%−10.5 pts

17Washington County, COCO4,732+0.1%−2.3 pts

18Delta County, COCO32,178+0.8%−31.9 pts

19San Juan County, COCO813+0.9%+26.0 pts

20Sedgwick County, COCO2,247+1.1%−1.1 pts

21Pitkin County, COCO16,625+1.2%−16.2 pts

22Montezuma County, COCO26,678+1.2%−26.4 pts

23Huerfano County, COCO7,011+1.6%−29.2 pts

24Crowley County, COCO5,677+1.7%−38.1 pts

25Lake County, COCO7,552+1.7%−28.3 pts

26Phillips County, COCO4,420+2.0%−5.0 pts

27Morgan County, COCO30,306+3.4%−20.5 pts

28Montrose County, COCO44,591+3.4%−33.5 pts

29Clear Creek County, COCO8,994+3.4%−19.0 pts

30Kiowa County, COCO1,412+3.4%+7.3 pts

31Lincoln County, COCO5,645+3.8%−30.6 pts

32Saguache County, COCO6,732+4.3%−23.8 pts

33Fremont County, COCO50,039+4.5%−38.5 pts

34Routt County, COCO25,329+5.6%−34.1 pts

35Pueblo County, COCO169,277+5.7%−9.2 pts

36Teller County, COCO24,756+5.8%−59.0 pts

37Grand County, COCO16,496+5.9%−50.3 pts

38Alamosa County, COCO16,688+6.0%−3.9 pts

39Mesa County, COCO162,845+6.1%−18.7 pts

40Gilpin County, COCO6,073+6.7%−48.2 pts

41Eagle County, COCO54,291+6.8%−83.2 pts

42Park County, COCO18,314+7.3%−95.1 pts

43La Plata County, COCO56,898+8.4%−27.7 pts

44Jefferson County, COCO580,451+9.0%−11.2 pts

45Chaffee County, COCO20,831+9.4%−18.7 pts

46Garfield County, COCO63,474+9.4%−36.7 pts

47San Miguel County, COCO7,753+9.7%−70.8 pts

48Ouray County, COCO5,265+9.9%−53.2 pts

49Gunnison County, COCO17,439+10.4%−25.4 pts

50Archuleta County, COCO14,306+10.6%−74.6 pts

51Custer County, COCO5,590+10.6%−71.3 pts

52Summit County, COCO31,517+10.9%−71.9 pts

53Boulder County, COCO328,560+12.3%−17.0 pts

54Dolores County, COCO2,466+12.7%−9.9 pts

55Elbert County, COCO30,534+12.9%−93.1 pts

56Arapahoe County, COCO673,820+14.5%−10.1 pts

57El Paso County, COCO757,040+17.4%−12.8 pts

58Adams County, COCO554,668+17.7%−19.6 pts

59Denver County, COCO740,613+19.2%+0.6 pts

60Larimer County, COCO377,292+19.8%−15.3 pts

61Mineral County, COCO910+21.5%−27.4 pts

62Douglas County, COCO399,396+25.4%−165.6 pts

63Weld County, COCO378,426+30.1%−7.1 pts

64Broomfield County, COCO79,174+32.6%–

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