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. The median across all 64 is +2.2%. Biggest climber in the top 100 since 2020: San Miguel County, CO, up 37 places to #10.

Flip the list · Fastest growing, US counties →

ColoradoAll states All rankings

SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01▲12Jackson County, COCO1,211-12.2%−10.4 pts

02▲18Sedgwick County, COCO2,247-6.5%−8.6 pts

03▲11Otero County, COCO17,683-5.4%−6.0 pts

04Baca County, COCO3,347-4.5%−3.7 pts

05Hinsdale County, COCO753-4.4%−73.6 pts

06▲23Clear Creek County, COCO8,994-4.3%−26.6 pts

07▲14Pitkin County, COCO16,625-4.2%−21.7 pts

08▲16Crowley County, COCO5,677-4.1%−44.0 pts

09▼2Logan County, COCO20,654-4.1%−20.8 pts

10▲37San Miguel County, COCO7,753-4.0%−84.5 pts

11▼1Rio Grande County, COCO11,087-3.9%−19.2 pts

12▲29Eagle County, COCO54,291-2.6%−92.6 pts

13▲13Phillips County, COCO4,420-2.4%−9.4 pts

14▲16Kiowa County, COCO1,412-2.4%+1.6 pts

15▼7Cheyenne County, COCO1,713-2.0%+4.9 pts

16▲1Washington County, COCO4,732-1.8%−4.1 pts

17▼6Moffat County, COCO13,122-1.3%−17.4 pts

18▼12Las Animas County, COCO14,391-1.1%−11.6 pts

19▼10Prowers County, COCO11,884-1.0%−9.5 pts

20▼4Yuma County, COCO9,896-0.9%−10.8 pts

21▲32Boulder County, COCO328,560-0.7%−29.9 pts

22▲9Lincoln County, COCO5,645-0.5%−34.9 pts

23▲21Jefferson County, COCO580,451-0.4%−20.6 pts

24▼23Kit Carson County, COCO7,069-0.3%−12.5 pts

25▲11Teller County, COCO24,756+0.2%−64.7 pts

26▲9Pueblo County, COCO169,277+0.7%−14.3 pts

27▼24Conejos County, COCO7,529+0.9%−11.8 pts

28▼26Bent County, COCO5,716+1.2%−17.7 pts

29▲23Summit County, COCO31,517+1.5%−81.3 pts

30▼5Lake County, COCO7,552+1.6%−28.5 pts

31▲7Alamosa County, COCO16,688+1.9%−8.0 pts

32▲2Routt County, COCO25,329+2.0%−37.8 pts

33Fremont County, COCO50,039+2.2%−40.7 pts

34▲9La Plata County, COCO56,898+2.3%−33.8 pts

35▼23Rio Blanco County, COCO6,683+2.4%+2.1 pts

36▼13Huerfano County, COCO7,011+2.8%−28.0 pts

37▲19Arapahoe County, COCO673,820+2.9%−21.8 pts

38▲8Garfield County, COCO63,474+2.9%−43.2 pts

39▲10Gunnison County, COCO17,439+3.1%−32.8 pts

40▼22Delta County, COCO32,178+3.1%−29.5 pts

41▼19Montezuma County, COCO26,678+3.2%−24.4 pts

42▲17Denver County, COCO740,613+3.5%−15.1 pts

43▲14El Paso County, COCO757,040+3.6%−26.6 pts

44▼17Morgan County, COCO30,306+4.1%−19.7 pts

45▼17Montrose County, COCO44,591+4.5%−32.4 pts

46▼6Gilpin County, COCO6,073+4.6%−50.4 pts

47▼8Mesa County, COCO162,845+4.6%−20.2 pts

48▼11Grand County, COCO16,496+5.0%−51.2 pts

49▲11Larimer County, COCO377,292+5.1%−30.0 pts

50▼35Costilla County, COCO3,679+5.1%−9.7 pts

51▲10Mineral County, COCO910+5.2%−43.7 pts

52▼10Park County, COCO18,314+5.3%−97.1 pts

53▼21Saguache County, COCO6,732+5.7%−22.4 pts

54Dolores County, COCO2,466+6.0%−16.6 pts

55▲3Adams County, COCO554,668+6.8%−30.5 pts

56▲8Broomfield County, COCO79,174+6.8%–

57▼12Chaffee County, COCO20,831+7.0%−21.1 pts

58▼8Archuleta County, COCO14,306+7.1%−78.1 pts

59▼11Ouray County, COCO5,265+8.0%−55.0 pts

60▲2Douglas County, COCO399,396+11.6%−179.5 pts

61▲2Weld County, COCO378,426+15.0%−22.2 pts

62▼43San Juan County, COCO813+15.3%+40.4 pts

63▼8Elbert County, COCO30,534+17.2%−88.9 pts

64▼13Custer County, COCO5,590+18.8%−63.0 pts

SHOWING 1–64 OF 64

Download CSV (full list, 64 rows)

UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES