RANKING · 2025 ESTIMATES · 64 SHOWN OF 64

Fastest growing, Colorado counties

Colorado counties ranked by population growth 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 Juan County, CO, up 43 places to #3.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01▲13Custer County, COCO5,590+18.8%−63.0 pts

02▲8Elbert County, COCO30,534+17.2%−88.9 pts

03▲43San Juan County, COCO813+15.3%+40.4 pts

04▼2Weld County, COCO378,426+15.0%−22.2 pts

05▼2Douglas County, COCO399,396+11.6%−179.5 pts

06▲11Ouray County, COCO5,265+8.0%−55.0 pts

07▲8Archuleta County, COCO14,306+7.1%−78.1 pts

08▲12Chaffee County, COCO20,831+7.0%−21.1 pts

09▼8Broomfield County, COCO79,174+6.8%–

10▼3Adams County, COCO554,668+6.8%−30.5 pts

11Dolores County, COCO2,466+6.0%−16.6 pts

12▲21Saguache County, COCO6,732+5.7%−22.4 pts

13▲10Park County, COCO18,314+5.3%−97.1 pts

14▼10Mineral County, COCO910+5.2%−43.7 pts

15▲35Costilla County, COCO3,679+5.1%−9.7 pts

16▼11Larimer County, COCO377,292+5.1%−30.0 pts

17▲11Grand County, COCO16,496+5.0%−51.2 pts

18▲8Mesa County, COCO162,845+4.6%−20.2 pts

19▲6Gilpin County, COCO6,073+4.6%−50.4 pts

20▲17Montrose County, COCO44,591+4.5%−32.4 pts

21▲17Morgan County, COCO30,306+4.1%−19.7 pts

22▼14El Paso County, COCO757,040+3.6%−26.6 pts

23▼17Denver County, COCO740,613+3.5%−15.1 pts

24▲19Montezuma County, COCO26,678+3.2%−24.4 pts

25▲22Delta County, COCO32,178+3.1%−29.5 pts

26▼10Gunnison County, COCO17,439+3.1%−32.8 pts

27▼8Garfield County, COCO63,474+2.9%−43.2 pts

28▼19Arapahoe County, COCO673,820+2.9%−21.8 pts

29▲13Huerfano County, COCO7,011+2.8%−28.0 pts

30▲23Rio Blanco County, COCO6,683+2.4%+2.1 pts

31▼9La Plata County, COCO56,898+2.3%−33.8 pts

32Fremont County, COCO50,039+2.2%−40.7 pts

33▼2Routt County, COCO25,329+2.0%−37.8 pts

34▼7Alamosa County, COCO16,688+1.9%−8.0 pts

35▲5Lake County, COCO7,552+1.6%−28.5 pts

36▼23Summit County, COCO31,517+1.5%−81.3 pts

37▲26Bent County, COCO5,716+1.2%−17.7 pts

38▲24Conejos County, COCO7,529+0.9%−11.8 pts

39▼9Pueblo County, COCO169,277+0.7%−14.3 pts

40▼11Teller County, COCO24,756+0.2%−64.7 pts

41▲23Kit Carson County, COCO7,069-0.3%−12.5 pts

42▼21Jefferson County, COCO580,451-0.4%−20.6 pts

43▼9Lincoln County, COCO5,645-0.5%−34.9 pts

44▼32Boulder County, COCO328,560-0.7%−29.9 pts

45▲4Yuma County, COCO9,896-0.9%−10.8 pts

46▲10Prowers County, COCO11,884-1.0%−9.5 pts

47▲12Las Animas County, COCO14,391-1.1%−11.6 pts

48▲6Moffat County, COCO13,122-1.3%−17.4 pts

49▼1Washington County, COCO4,732-1.8%−4.1 pts

50▲7Cheyenne County, COCO1,713-2.0%+4.9 pts

51▼16Kiowa County, COCO1,412-2.4%+1.6 pts

52▼13Phillips County, COCO4,420-2.4%−9.4 pts

53▼29Eagle County, COCO54,291-2.6%−92.6 pts

54▲1Rio Grande County, COCO11,087-3.9%−19.2 pts

55▼37San Miguel County, COCO7,753-4.0%−84.5 pts

56▲2Logan County, COCO20,654-4.1%−20.8 pts

57▼16Crowley County, COCO5,677-4.1%−44.0 pts

58▼14Pitkin County, COCO16,625-4.2%−21.7 pts

59▼23Clear Creek County, COCO8,994-4.3%−26.6 pts

60Hinsdale County, COCO753-4.4%−73.6 pts

61Baca County, COCO3,347-4.5%−3.7 pts

62▼11Otero County, COCO17,683-5.4%−6.0 pts

63▼18Sedgwick County, COCO2,247-6.5%−8.6 pts

64▼12Jackson County, COCO1,211-12.2%−10.4 pts

SHOWING 1–64 OF 64

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