RANKING · 1990 CENSUS · 63 SHOWN OF 63

Largest by population, Colorado counties · 1990

The most populous Colorado counties as of the 1990 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 –

01Denver County, COCO467,610–

02Jefferson County, COCO438,430–

03El Paso County, COCO397,014–

04Arapahoe County, COCO391,511–

05Adams County, COCO265,038–

06Boulder County, COCO225,339–

07Larimer County, COCO186,136–

08Weld County, COCO131,821–

09Pueblo County, COCO123,051–

10Mesa County, COCO93,145–

11Douglas County, COCO60,391–

12La Plata County, COCO32,284–

13Fremont County, COCO32,273–

14Garfield County, COCO29,974–

15Montrose County, COCO24,423–

16Morgan County, COCO21,939–

17Eagle County, COCO21,928–

18Delta County, COCO20,980–

19Otero County, COCO20,185–

20Montezuma County, COCO18,672–

21Logan County, COCO17,567–

22Routt County, COCO14,088–

23Las Animas County, COCO13,765–

24Alamosa County, COCO13,617–

25Prowers County, COCO13,347–

26Summit County, COCO12,881–

27Chaffee County, COCO12,684–

28Pitkin County, COCO12,661–

29Teller County, COCO12,468–

30Moffat County, COCO11,357–

31Rio Grande County, COCO10,770–

32Gunnison County, COCO10,273–

33Elbert County, COCO9,646–

34Yuma County, COCO8,954–

35Grand County, COCO7,966–

36Clear Creek County, COCO7,619–

37Conejos County, COCO7,453–

38Park County, COCO7,174–

39Kit Carson County, COCO7,140–

40Huerfano County, COCO6,009–

41Lake County, COCO6,007–

42Rio Blanco County, COCO5,972–

43Archuleta County, COCO5,345–

44Bent County, COCO5,048–

45Washington County, COCO4,812–

46Saguache County, COCO4,619–

47Baca County, COCO4,556–

48Lincoln County, COCO4,529–

49Phillips County, COCO4,189–

50Crowley County, COCO3,946–

51San Miguel County, COCO3,653–

52Costilla County, COCO3,190–

53Gilpin County, COCO3,070–

54Sedgwick County, COCO2,690–

55Cheyenne County, COCO2,397–

56Ouray County, COCO2,295–

57Custer County, COCO1,926–

58Kiowa County, COCO1,688–

59Jackson County, COCO1,605–

60Dolores County, COCO1,504–

61San Juan County, COCO745–

62Mineral County, COCO558–

63Hinsdale County, COCO467–

SHOWING 1–63 OF 63

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