RANKING · 2020 CENSUS · 64 SHOWN OF 64

Most sparsely populated, Colorado counties · 2020

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, COCO7531−0%

02Kiowa County, COCO1,4121−11%

03Jackson County, COCO1,2111−13%

04Cheyenne County, COCO1,7131−22%

05Mineral County, COCO9101+4%

06Baca County, COCO3,3471−22%

07San Juan County, COCO8132+26%

08Washington County, COCO4,7322−2%

09Saguache County, COCO6,7322+8%

10Rio Blanco County, COCO6,6832+9%

11Dolores County, COCO2,4662+26%

12Lincoln County, COCO5,6452−7%

13Moffat County, COCO13,1223+1%

14Costilla County, COCO3,6793−4%

15Las Animas County, COCO14,3913−4%

16Kit Carson County, COCO7,0693−12%

17Bent County, COCO5,7164−6%

18Yuma County, COCO9,8964+1%

19Huerfano County, COCO7,0114−13%

20Sedgwick County, COCO2,2474−12%

21Gunnison County, COCO17,4395+21%

22Conejos County, COCO7,5296−11%

23San Miguel County, COCO7,7536+22%

24Custer County, COCO5,5906+34%

25Phillips County, COCO4,4207+1%

26Prowers County, COCO11,8847−17%

27Crowley County, COCO5,6778+7%

28Park County, COCO18,3148+20%

29Grand County, COCO16,4969+26%

30Ouray County, COCO5,2659+30%

31Archuleta County, COCO14,30610+35%

32Routt County, COCO25,32911+26%

33Logan County, COCO20,65412+5%

34Rio Grande County, COCO11,08713−7%

35Montezuma County, COCO26,67813+8%

36Elbert County, COCO30,53414+31%

37Otero County, COCO17,68315−8%

38Pitkin County, COCO16,62518+17%

39Montrose County, COCO44,59119+28%

40Chaffee County, COCO20,83119+20%

41Lake County, COCO7,55220−5%

42Garfield County, COCO63,47421+41%

43Alamosa County, COCO16,68823+9%

44Morgan County, COCO30,30623+7%

45Clear Creek County, COCO8,99424+1%

46Delta County, COCO32,17827+12%

47Fremont County, COCO50,03932+6%

48La Plata County, COCO56,89833+27%

49Eagle County, COCO54,29133+34%

50Gilpin County, COCO6,07339+22%

51Teller County, COCO24,75644+20%

52Mesa County, COCO162,84547+34%

53Summit County, COCO31,51751+32%

54Pueblo County, COCO169,27770+19%

55Weld County, COCO378,42683+82%

56Larimer County, COCO377,292138+43%

57El Paso County, COCO757,040343+41%

58Douglas County, COCO399,396426+104%

59Adams County, COCO554,668445+43%

60Boulder County, COCO328,560455+14%

61Jefferson County, COCO580,451763+11%

62Arapahoe County, COCO673,820821+34%

63Broomfield County, COCO79,1742,248–

64Denver County, COCO740,6134,674+29%

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