RANKING · 1990 CENSUS · 63 SHOWN OF 63

Most sparsely populated, Colorado counties · 1990

Colorado counties with the fewest residents per square mile (2023). This list covers the 63 counties in Colorado that qualify, ranked against each other statewide.

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YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Hinsdale County, COCO7530−41%

02Mineral County, COCO9101−33%

03Kiowa County, COCO1,4121+4%

04Jackson County, COCO1,2111+2%

05Cheyenne County, COCO1,7131+7%

06Dolores County, COCO2,4661−18%

07Saguache County, COCO6,7321−22%

08Lincoln County, COCO5,6452−26%

09Baca County, COCO3,3472+1%

10Rio Blanco County, COCO6,6832−0%

11Washington County, COCO4,7322−2%

12San Juan County, COCO8132+34%

13Moffat County, COCO13,1222−14%

14Costilla County, COCO3,6793−13%

15Custer County, COCO5,5903−45%

16San Miguel County, COCO7,7533−45%

17Las Animas County, COCO14,3913−9%

18Gunnison County, COCO17,4393−26%

19Park County, COCO18,3143−51%

20Kit Carson County, COCO7,0693−11%

21Bent County, COCO5,7163−16%

22Huerfano County, COCO7,0114−24%

23Yuma County, COCO9,8964−9%

24Archuleta County, COCO14,3064−46%

25Ouray County, COCO5,2654−39%

26Grand County, COCO16,4964−36%

27Sedgwick County, COCO2,2475−2%

28Crowley County, COCO5,6775−28%

29Elbert County, COCO30,5345−51%

30Conejos County, COCO7,5296−11%

31Routt County, COCO25,3296−28%

32Phillips County, COCO4,4206−6%

33Prowers County, COCO11,8848−8%

34Montezuma County, COCO26,6789−22%

35Logan County, COCO20,65410−14%

36Garfield County, COCO63,47410−32%

37Montrose County, COCO44,59111−27%

38Rio Grande County, COCO11,08712−13%

39Chaffee County, COCO20,83113−22%

40Eagle County, COCO54,29113−47%

41Pitkin County, COCO16,62513−15%

42Lake County, COCO7,55216−23%

43Otero County, COCO17,68316−1%

44Morgan County, COCO30,30617−19%

45Delta County, COCO32,17818−25%

46Alamosa County, COCO16,68819−9%

47La Plata County, COCO56,89819−27%

48Clear Creek County, COCO8,99419−18%

49Gilpin County, COCO6,07320−35%

50Fremont County, COCO50,03921−30%

51Summit County, COCO31,51721−45%

52Teller County, COCO24,75622−39%

53Mesa County, COCO162,84528−20%

54Weld County, COCO378,42633−27%

55Pueblo County, COCO169,27752−13%

56Larimer County, COCO377,29272−26%

57Douglas County, COCO399,39672−66%

58El Paso County, COCO757,040187−23%

59Adams County, COCO554,668227−27%

60Boulder County, COCO328,560310−23%

61Arapahoe County, COCO673,820491−20%

62Jefferson County, COCO580,451574−17%

63Denver County, COCO740,6133,055−16%

SHOWING 1–63 OF 63

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