RANKING · 2020 CENSUS · 64 SHOWN OF 64

Fastest shrinking, Colorado counties

Colorado counties with the steepest population decline since the prior decennial census. This list covers the 64 counties in Colorado that qualify, ranked against each other statewide.

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YEAR2000 2010 2020

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Kit Carson County, COCO7,069-14.3%−217%

02Bent County, COCO5,716-13.1%−169%

03Conejos County, COCO7,529-9.6%−176%

04Baca County, COCO3,347-7.4%+770%

05Hinsdale County, COCO753-6.5%−109%

06Las Animas County, COCO14,391-6.1%−159%

07Logan County, COCO20,654-5.2%−131%

08Cheyenne County, COCO1,713-4.8%−31%

09Prowers County, COCO11,884-4.4%−152%

10Rio Grande County, COCO11,087-3.7%−124%

11Moffat County, COCO13,122-3.6%−123%

12Rio Blanco County, COCO6,683-2.1%−977%

13Jackson County, COCO1,211-1.1%−38%

14Otero County, COCO17,683-0.7%−220%

15Costilla County, COCO3,679-0.7%−105%

16Yuma County, COCO9,896-0.5%−106%

17Washington County, COCO4,732+0.1%−97%

18Delta County, COCO32,178+0.8%−98%

19San Juan County, COCO813+0.9%−103%

20Sedgwick County, COCO2,247+1.1%−50%

21Pitkin County, COCO16,625+1.2%−93%

22Montezuma County, COCO26,678+1.2%−96%

23Huerfano County, COCO7,011+1.6%−95%

24Crowley County, COCO5,677+1.7%−96%

25Lake County, COCO7,552+1.7%−94%

26Phillips County, COCO4,420+2.0%−71%

27Morgan County, COCO30,306+3.4%−86%

28Montrose County, COCO44,591+3.4%−91%

29Clear Creek County, COCO8,994+3.4%−85%

30Kiowa County, COCO1,412+3.4%−188%

31Lincoln County, COCO5,645+3.8%−89%

32Saguache County, COCO6,732+4.3%−85%

33Fremont County, COCO50,039+4.5%−89%

34Routt County, COCO25,329+5.6%−86%

35Pueblo County, COCO169,277+5.7%−62%

36Teller County, COCO24,756+5.8%−91%

37Grand County, COCO16,496+5.9%−90%

38Alamosa County, COCO16,688+6.0%−39%

39Mesa County, COCO162,845+6.1%−75%

40Gilpin County, COCO6,073+6.7%−88%

41Eagle County, COCO54,291+6.8%−92%

42Park County, COCO18,314+7.3%−93%

43La Plata County, COCO56,898+8.4%−77%

44Jefferson County, COCO580,451+9.0%−55%

45Chaffee County, COCO20,831+9.4%−67%

46Garfield County, COCO63,474+9.4%−80%

47San Miguel County, COCO7,753+9.7%−88%

48Ouray County, COCO5,265+9.9%−84%

49Gunnison County, COCO17,439+10.4%−71%

50Archuleta County, COCO14,306+10.6%−88%

51Custer County, COCO5,590+10.6%−87%

52Summit County, COCO31,517+10.9%−87%

53Boulder County, COCO328,560+12.3%−58%

54Dolores County, COCO2,466+12.7%−44%

55Elbert County, COCO30,534+12.9%−88%

56Arapahoe County, COCO673,820+14.5%−41%

57El Paso County, COCO757,040+17.4%−42%

58Adams County, COCO554,668+17.7%−53%

59Denver County, COCO740,613+19.2%+3%

60Larimer County, COCO377,292+19.8%−44%

61Mineral County, COCO910+21.5%−56%

62Douglas County, COCO399,396+25.4%−87%

63Weld County, COCO378,426+30.1%−19%

64Broomfield County, COCO79,174+32.6%–

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