RANKING · 2000 CENSUS · 63 SHOWN OF 63

Fastest shrinking, Colorado counties · 2000

Colorado counties with the steepest population decline since the prior decennial census. This list covers the 63 counties in Colorado that qualify, ranked against each other statewide.

Flip the list · Fastest growing, US counties →

ColoradoAll states All rankings

SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Most densely populated Most sparsely populated Best broadband access Worst broadband access

YEAR2000 2010 2020

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01San Juan County, COCO813-25.1%+0%

02Cheyenne County, COCO1,713-6.9%+0%

03Kiowa County, COCO1,412-3.9%+0%

04Jackson County, COCO1,211-1.7%+0%

05Baca County, COCO3,347-0.9%+0%

06Rio Blanco County, COCO6,683+0.2%+0%

07Otero County, COCO17,683+0.6%+0%

08Sedgwick County, COCO2,247+2.1%+0%

09Washington County, COCO4,732+2.4%+0%

10Phillips County, COCO4,420+6.9%+0%

11Prowers County, COCO11,884+8.5%+0%

12Yuma County, COCO9,896+9.9%+0%

13Alamosa County, COCO16,688+9.9%+0%

14Las Animas County, COCO14,391+10.5%+0%

15Kit Carson County, COCO7,069+12.2%+0%

16Conejos County, COCO7,529+12.7%+0%

17Costilla County, COCO3,679+14.8%+0%

18Pueblo County, COCO169,277+15.0%+0%

19Rio Grande County, COCO11,087+15.3%+0%

20Moffat County, COCO13,122+16.1%+0%

21Logan County, COCO20,654+16.7%+0%

22Pitkin County, COCO16,625+17.5%+0%

23Denver County, COCO740,613+18.6%+0%

24Bent County, COCO5,716+18.8%+0%

25Jefferson County, COCO580,451+20.2%+0%

26Clear Creek County, COCO8,994+22.4%+0%

27Dolores County, COCO2,466+22.6%+0%

28Morgan County, COCO30,306+23.8%+0%

29Arapahoe County, COCO673,820+24.6%+0%

30Mesa County, COCO162,845+24.8%+0%

31Montezuma County, COCO26,678+27.6%+0%

32Chaffee County, COCO20,831+28.1%+0%

33Saguache County, COCO6,732+28.1%+0%

34Boulder County, COCO328,560+29.3%+0%

35Lake County, COCO7,552+30.0%+0%

36El Paso County, COCO757,040+30.2%+0%

37Huerfano County, COCO7,011+30.8%+0%

38Delta County, COCO32,178+32.7%+0%

39Lincoln County, COCO5,645+34.4%+0%

40Larimer County, COCO377,292+35.1%+0%

41Gunnison County, COCO17,439+35.9%+0%

42La Plata County, COCO56,898+36.1%+0%

43Montrose County, COCO44,591+36.9%+0%

44Weld County, COCO378,426+37.3%+0%

45Adams County, COCO554,668+37.3%+0%

46Routt County, COCO25,329+39.8%+0%

47Crowley County, COCO5,677+39.8%+0%

48Fremont County, COCO50,039+43.0%+0%

49Garfield County, COCO63,474+46.1%+0%

50Mineral County, COCO910+48.9%+0%

51Gilpin County, COCO6,073+55.0%+0%

52Grand County, COCO16,496+56.2%+0%

53Ouray County, COCO5,265+63.1%+0%

54Teller County, COCO24,756+64.9%+0%

55Hinsdale County, COCO753+69.2%+0%

56San Miguel County, COCO7,753+80.5%+0%

57Custer County, COCO5,590+81.9%+0%

58Summit County, COCO31,517+82.8%+0%

59Archuleta County, COCO14,306+85.2%+0%

60Eagle County, COCO54,291+90.0%+0%

61Park County, COCO18,314+102.4%+0%

62Elbert County, COCO30,534+106.0%+0%

63Douglas County, COCO399,396+191.0%+0%

SHOWING 1–63 OF 63

Download CSV (full list, 63 rows)

UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES