RANKING · 2010 CENSUS · 64 SHOWN OF 64

Most densely populated, Colorado counties · 2010

Colorado counties ranked by residents per square mile (2010). This list covers the 64 counties in Colorado that qualify, ranked against each other statewide. The median across all 64 is 12.

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SAME RANKING BYCities States Metros

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Denver County, COCO740,6133,921+8%

02Broomfield County, COCO79,1741,695–

03Arapahoe County, COCO673,820717+17%

04Jefferson County, COCO580,451699+1%

05Boulder County, COCO328,560406+1%

06Adams County, COCO554,668378+21%

07Douglas County, COCO399,396339+62%

08El Paso County, COCO757,040293+20%

09Larimer County, COCO377,292115+19%

10Pueblo County, COCO169,27767+12%

11Weld County, COCO378,42663+40%

12Summit County, COCO31,51746+19%

13Mesa County, COCO162,84544+26%

14Teller County, COCO24,75642+14%

15Gilpin County, COCO6,07336+14%

16Eagle County, COCO54,29131+25%

17Fremont County, COCO50,03931+1%

18La Plata County, COCO56,89830+17%

19Delta County, COCO32,17827+11%

20Clear Creek County, COCO8,99423−3%

21Morgan County, COCO30,30622+4%

22Alamosa County, COCO16,68821+3%

23Lake County, COCO7,55219−6%

24Garfield County, COCO63,47419+29%

25Montrose County, COCO44,59118+23%

26Pitkin County, COCO16,62518+15%

27Chaffee County, COCO20,83118+10%

28Otero County, COCO17,68315−7%

29Rio Grande County, COCO11,08713−3%

30Montezuma County, COCO26,67813+7%

31Elbert County, COCO30,53412+16%

32Logan County, COCO20,65412+11%

33Routt County, COCO25,32910+19%

34Archuleta County, COCO14,3069+22%

35Ouray County, COCO5,2658+19%

36Grand County, COCO16,4968+19%

37Prowers County, COCO11,8848−13%

38Crowley County, COCO5,6777+6%

39Park County, COCO18,3147+12%

40Phillips County, COCO4,4206−1%

41Conejos County, COCO7,5296−2%

42Custer County, COCO5,5906+21%

43San Miguel County, COCO7,7536+12%

44Gunnison County, COCO17,4395+10%

45Sedgwick County, COCO2,2474−13%

46Bent County, COCO5,7164+8%

47Yuma County, COCO9,8964+2%

48Huerfano County, COCO7,0114−15%

49Kit Carson County, COCO7,0694+3%

50Las Animas County, COCO14,3913+2%

51Moffat County, COCO13,1223+5%

52Costilla County, COCO3,6793−4%

53Lincoln County, COCO5,6452−10%

54Rio Blanco County, COCO6,6832+11%

55Dolores County, COCO2,4662+12%

56Saguache County, COCO6,7322+3%

57Washington County, COCO4,7322−2%

58San Juan County, COCO8132+25%

59Baca County, COCO3,3471−16%

60Cheyenne County, COCO1,7131−18%

61Jackson County, COCO1,2111−12%

62Mineral County, COCO9101−14%

63Kiowa County, COCO1,4121−14%

64Hinsdale County, COCO7531+7%

SHOWING 1–64 OF 64

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS