RANKING · 2010 CENSUS · 64 SHOWN OF 64

Most sparsely populated, Colorado counties · 2010

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+7%

02Kiowa County, COCO1,4121−14%

03Mineral County, COCO9101−14%

04Jackson County, COCO1,2111−12%

05Cheyenne County, COCO1,7131−18%

06Baca County, COCO3,3471−16%

07San Juan County, COCO8132+25%

08Washington County, COCO4,7322−2%

09Saguache County, COCO6,7322+3%

10Dolores County, COCO2,4662+12%

11Rio Blanco County, COCO6,6832+11%

12Lincoln County, COCO5,6452−10%

13Costilla County, COCO3,6793−4%

14Moffat County, COCO13,1223+5%

15Las Animas County, COCO14,3913+2%

16Kit Carson County, COCO7,0694+3%

17Huerfano County, COCO7,0114−15%

18Yuma County, COCO9,8964+2%

19Bent County, COCO5,7164+8%

20Sedgwick County, COCO2,2474−13%

21Gunnison County, COCO17,4395+10%

22San Miguel County, COCO7,7536+12%

23Custer County, COCO5,5906+21%

24Conejos County, COCO7,5296−2%

25Phillips County, COCO4,4206−1%

26Park County, COCO18,3147+12%

27Crowley County, COCO5,6777+6%

28Prowers County, COCO11,8848−13%

29Grand County, COCO16,4968+19%

30Ouray County, COCO5,2658+19%

31Archuleta County, COCO14,3069+22%

32Routt County, COCO25,32910+19%

33Logan County, COCO20,65412+11%

34Elbert County, COCO30,53412+16%

35Montezuma County, COCO26,67813+7%

36Rio Grande County, COCO11,08713−3%

37Otero County, COCO17,68315−7%

38Chaffee County, COCO20,83118+10%

39Pitkin County, COCO16,62518+15%

40Montrose County, COCO44,59118+23%

41Garfield County, COCO63,47419+29%

42Lake County, COCO7,55219−6%

43Alamosa County, COCO16,68821+3%

44Morgan County, COCO30,30622+4%

45Clear Creek County, COCO8,99423−3%

46Delta County, COCO32,17827+11%

47La Plata County, COCO56,89830+17%

48Fremont County, COCO50,03931+1%

49Eagle County, COCO54,29131+25%

50Gilpin County, COCO6,07336+14%

51Teller County, COCO24,75642+14%

52Mesa County, COCO162,84544+26%

53Summit County, COCO31,51746+19%

54Weld County, COCO378,42663+40%

55Pueblo County, COCO169,27767+12%

56Larimer County, COCO377,292115+19%

57El Paso County, COCO757,040293+20%

58Douglas County, COCO399,396339+62%

59Adams County, COCO554,668378+21%

60Boulder County, COCO328,560406+1%

61Jefferson County, COCO580,451699+1%

62Arapahoe County, COCO673,820717+17%

63Broomfield County, COCO79,1741,695–

64Denver County, COCO740,6133,921+8%

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