RANKING · 2000 CENSUS · 63 SHOWN OF 63

Largest by population, Colorado counties · 2000

The most populous Colorado counties as of the 2000 population estimates. This list covers the 63 counties in Colorado that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDFastest growing Fastest shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR1990 2000 2010 2020 2025

RANKPLACESTATETOTAL POPULATIONVS 1990

01Denver County, COCO554,636+19%

02Jefferson County, COCO527,056+20%

03El Paso County, COCO516,929+30%

04Arapahoe County, COCO487,967+25%

05Adams County, COCO363,857+37%

06Boulder County, COCO291,288+29%

07Larimer County, COCO251,494+35%

08Weld County, COCO180,936+37%

09Douglas County, COCO175,766+191%

10Pueblo County, COCO141,472+15%

11Mesa County, COCO116,255+25%

12Fremont County, COCO46,145+43%

13La Plata County, COCO43,941+36%

14Garfield County, COCO43,791+46%

15Eagle County, COCO41,659+90%

16Montrose County, COCO33,432+37%

17Delta County, COCO27,834+33%

18Morgan County, COCO27,171+24%

19Montezuma County, COCO23,830+28%

20Summit County, COCO23,548+83%

21Teller County, COCO20,555+65%

22Logan County, COCO20,504+17%

23Otero County, COCO20,311+1%

24Elbert County, COCO19,872+106%

25Routt County, COCO19,690+40%

26Chaffee County, COCO16,242+28%

27Las Animas County, COCO15,207+10%

28Alamosa County, COCO14,966+10%

29Pitkin County, COCO14,872+17%

30Park County, COCO14,523+102%

31Prowers County, COCO14,483+9%

32Gunnison County, COCO13,956+36%

33Moffat County, COCO13,184+16%

34Grand County, COCO12,442+56%

35Rio Grande County, COCO12,413+15%

36Archuleta County, COCO9,898+85%

37Yuma County, COCO9,841+10%

38Clear Creek County, COCO9,322+22%

39Conejos County, COCO8,400+13%

40Kit Carson County, COCO8,011+12%

41Huerfano County, COCO7,862+31%

42Lake County, COCO7,812+30%

43San Miguel County, COCO6,594+81%

44Lincoln County, COCO6,087+34%

45Bent County, COCO5,998+19%

46Rio Blanco County, COCO5,986+0%

47Saguache County, COCO5,917+28%

48Crowley County, COCO5,518+40%

49Washington County, COCO4,926+2%

50Gilpin County, COCO4,757+55%

51Baca County, COCO4,517−1%

52Phillips County, COCO4,480+7%

53Ouray County, COCO3,742+63%

54Costilla County, COCO3,663+15%

55Custer County, COCO3,503+82%

56Sedgwick County, COCO2,747+2%

57Cheyenne County, COCO2,231−7%

58Dolores County, COCO1,844+23%

59Kiowa County, COCO1,622−4%

60Jackson County, COCO1,577−2%

61Mineral County, COCO831+49%

62Hinsdale County, COCO790+69%

63San Juan County, COCO558−25%

SHOWING 1–63 OF 63

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS