RANKING · 2025 ACS · 64 SHOWN OF 64

Most sparsely populated, Colorado counties

Colorado counties with the fewest residents per square mile (2023). This list covers the 64 counties in Colorado that qualify, ranked against each other statewide.

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YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Hinsdale County, COCO7531−5%

02Jackson County, COCO1,2111−23%

03Kiowa County, COCO1,4121−13%

04Cheyenne County, COCO1,7131−23%

05Mineral County, COCO9101+10%

06Baca County, COCO3,3471−26%

07Washington County, COCO4,7322−4%

08Rio Blanco County, COCO6,6832+12%

09San Juan County, COCO8132+46%

10Saguache County, COCO6,7322+14%

11Lincoln County, COCO5,6452−7%

12Dolores County, COCO2,4662+34%

13Moffat County, COCO13,1223−0%

14Costilla County, COCO3,6793+0%

15Las Animas County, COCO14,3913−5%

16Kit Carson County, COCO7,0693−12%

17Bent County, COCO5,7164−5%

18Sedgwick County, COCO2,2474−18%

19Yuma County, COCO9,8964+1%

20Huerfano County, COCO7,0114−11%

21Gunnison County, COCO17,4395+25%

22Conejos County, COCO7,5296−10%

23San Miguel County, COCO7,7536+18%

24Phillips County, COCO4,4206−1%

25Crowley County, COCO5,6777+3%

26Prowers County, COCO11,8847−18%

27Custer County, COCO5,5908+60%

28Park County, COCO18,3148+26%

29Grand County, COCO16,4969+33%

30Ouray County, COCO5,26510+41%

31Archuleta County, COCO14,30611+45%

32Routt County, COCO25,32911+29%

33Logan County, COCO20,65411+1%

34Rio Grande County, COCO11,08712−11%

35Montezuma County, COCO26,67813+12%

36Otero County, COCO17,68314−13%

37Elbert County, COCO30,53417+54%

38Pitkin County, COCO16,62517+12%

39Montrose County, COCO44,59120+33%

40Lake County, COCO7,55220−3%

41Chaffee County, COCO20,83121+28%

42Garfield County, COCO63,47422+45%

43Clear Creek County, COCO8,99423−4%

44Alamosa County, COCO16,68823+12%

45Morgan County, COCO30,30624+12%

46Delta County, COCO32,17828+16%

47Eagle County, COCO54,29132+30%

48Fremont County, COCO50,03933+8%

49La Plata County, COCO56,89834+29%

50Gilpin County, COCO6,07340+28%

51Teller County, COCO24,75644+20%

52Mesa County, COCO162,84549+40%

53Summit County, COCO31,51752+34%

54Pueblo County, COCO169,27771+20%

55Weld County, COCO378,42695+109%

56Larimer County, COCO377,292145+50%

57El Paso County, COCO757,040356+46%

58Boulder County, COCO328,560452+13%

59Douglas County, COCO399,396475+127%

60Adams County, COCO554,668475+52%

61Jefferson County, COCO580,451759+10%

62Arapahoe County, COCO673,820845+38%

63Broomfield County, COCO79,1742,402–

64Denver County, COCO740,6134,838+34%

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