RANKING · 2025 ESTIMATES · 64 SHOWN OF 64

Most sparsely populated, Colorado counties

Colorado counties with the fewest residents per square mile (2025). This list covers the 64 counties in Colorado that qualify, ranked against each other statewide. The median across all 64 is 11.

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SAME RANKING BYCities States Metros

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Hinsdale County, COCO7531−5%

02▲1Jackson County, COCO1,2111−23%

03▼1Kiowa County, COCO1,4121−13%

04Cheyenne County, COCO1,7131−23%

05Mineral County, COCO9101+10%

06Baca County, COCO3,3471−26%

07▲1Washington County, COCO4,7322−4%

08▲2Rio Blanco County, COCO6,6832+12%

09▼2San Juan County, COCO8132+46%

10▼1Saguache County, COCO6,7322+14%

11▲1Lincoln County, COCO5,6452−7%

12▼1Dolores County, COCO2,4662+34%

13Moffat County, COCO13,12230%

14Costilla County, COCO3,67930%

15Las Animas County, COCO14,3913−5%

16Kit Carson County, COCO7,0693−12%

17Bent County, COCO5,7164−5%

18▲2Sedgwick County, COCO2,2474−18%

19▼1Yuma County, COCO9,8964+1%

20▼1Huerfano County, COCO7,0114−11%

21Gunnison County, COCO17,4395+25%

22Conejos County, COCO7,5296−10%

23San Miguel County, COCO7,7536+18%

24▲1Phillips County, COCO4,4206−1%

25▲2Crowley County, COCO5,6777+3%

26Prowers County, COCO11,8847−18%

27▼3Custer 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%

36▲1Otero County, COCO17,68314−13%

37▼1Elbert County, COCO30,53417+54%

38Pitkin County, COCO16,62517+12%

39Montrose County, COCO44,59120+33%

40▲1Lake County, COCO7,55220−3%

41▼1Chaffee County, COCO20,83121+28%

42Garfield County, COCO63,47422+45%

43▲2Clear Creek County, COCO8,99423−4%

44▼1Alamosa County, COCO16,68823+12%

45▼1Morgan County, COCO30,30624+12%

46Delta County, COCO32,17828+16%

47▲2Eagle County, COCO54,29132+30%

48▼1Fremont County, COCO50,03933+8%

49▼1La 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%

58▲2Boulder County, COCO328,560452+13%

59▼1Douglas County, COCO399,396475+127%

60▼1Adams 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 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES