RANKING · 2010 CENSUS · 63 SHOWN OF 63

Fastest shrinking, Colorado counties · 2010

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

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Cheyenne County, COCO1,713-17.7%−10.8 pts

02Baca County, COCO3,347-16.1%−15.3 pts

03Huerfano County, COCO7,011-14.6%−45.5 pts

04Mineral County, COCO910-14.3%−63.2 pts

05Kiowa County, COCO1,412-13.8%−9.9 pts

06Sedgwick County, COCO2,247-13.4%−15.5 pts

07Prowers County, COCO11,884-13.3%−21.9 pts

08Jackson County, COCO1,211-11.6%−9.9 pts

09Lincoln County, COCO5,645-10.2%−44.6 pts

10Otero County, COCO17,683-7.3%−7.9 pts

11Lake County, COCO7,552-6.4%−36.5 pts

12Costilla County, COCO3,679-3.8%−18.6 pts

13Rio Grande County, COCO11,087-3.5%−18.7 pts

14Clear Creek County, COCO8,994-2.5%−24.9 pts

15Washington County, COCO4,732-2.3%−4.6 pts

16Conejos County, COCO7,529-1.7%−14.4 pts

17Phillips County, COCO4,420-0.8%−7.8 pts

18Boulder County, COCO328,560+1.1%−28.1 pts

19Jefferson County, COCO580,451+1.4%−18.8 pts

20Fremont County, COCO50,039+1.5%−41.5 pts

21Las Animas County, COCO14,391+2.0%−8.5 pts

22Yuma County, COCO9,896+2.1%−7.9 pts

23Alamosa County, COCO16,688+3.2%−6.7 pts

24Saguache County, COCO6,732+3.2%−24.9 pts

25Kit Carson County, COCO7,069+3.2%−9.0 pts

26Morgan County, COCO30,306+3.6%−20.2 pts

27Moffat County, COCO13,122+4.6%−11.5 pts

28Crowley County, COCO5,677+5.5%−34.3 pts

29Hinsdale County, COCO753+6.7%−62.5 pts

30Montezuma County, COCO26,678+7.2%−20.5 pts

31Denver County, COCO740,613+8.2%−10.4 pts

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

33Chaffee County, COCO20,831+9.6%−18.4 pts

34Gunnison County, COCO17,439+9.8%−26.0 pts

35Logan County, COCO20,654+10.8%−6.0 pts

36Delta County, COCO32,178+11.2%−21.5 pts

37Rio Blanco County, COCO6,683+11.4%+11.1 pts

38Park County, COCO18,314+11.6%−90.9 pts

39San Miguel County, COCO7,753+11.6%−68.9 pts

40Dolores County, COCO2,466+11.9%−10.7 pts

41Pueblo County, COCO169,277+12.4%−2.5 pts

42Teller County, COCO24,756+13.6%−51.3 pts

43Gilpin County, COCO6,073+14.4%−40.6 pts

44Pitkin County, COCO16,625+15.3%−2.2 pts

45Elbert County, COCO30,534+16.2%−89.8 pts

46La Plata County, COCO56,898+16.8%−19.3 pts

47Arapahoe County, COCO673,820+17.2%−7.4 pts

48Ouray County, COCO5,265+18.5%−44.5 pts

49Summit County, COCO31,517+18.9%−63.9 pts

50Larimer County, COCO377,292+19.1%−16.0 pts

51Grand County, COCO16,496+19.3%−36.9 pts

52Routt County, COCO25,329+19.4%−20.4 pts

53El Paso County, COCO757,040+20.4%−9.8 pts

54Adams County, COCO554,668+21.4%−15.9 pts

55Custer County, COCO5,590+21.5%−60.4 pts

56Archuleta County, COCO14,306+22.1%−63.1 pts

57Montrose County, COCO44,591+23.5%−13.4 pts

58San Juan County, COCO813+25.3%+50.4 pts

59Eagle County, COCO54,291+25.3%−64.7 pts

60Mesa County, COCO162,845+26.2%+1.4 pts

61Garfield County, COCO63,474+28.8%−17.3 pts

62Weld County, COCO378,426+39.7%+2.5 pts

63Douglas County, COCO399,396+62.4%−128.6 pts

SHOWING 1–63 OF 63

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