RANKING · 2025 ESTIMATES · 64 SHOWN OF 64

Most densely populated, Colorado counties

Colorado counties ranked by residents per square mile (2025). This list covers the 64 counties in Colorado that qualify, ranked against each other statewide.

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RELATEDLargest by population Fastest growing Fastest shrinking Most population gained Most population lost Most sparsely populated

RANKPLACESTATEPOPPOPULATION DENSITYVS –

01Denver County, COCO740,6134,838–

02Broomfield County, COCO79,1742,402–

03Arapahoe County, COCO673,820845–

04Jefferson County, COCO580,451759–

05Adams County, COCO554,668475–

06Douglas County, COCO399,396475–

07Boulder County, COCO328,560452–

08El Paso County, COCO757,040356–

09Larimer County, COCO377,292145–

10Weld County, COCO378,42695–

11Pueblo County, COCO169,27771–

12Summit County, COCO31,51752–

13Mesa County, COCO162,84549–

14Teller County, COCO24,75644–

15Gilpin County, COCO6,07340–

16La Plata County, COCO56,89834–

17Fremont County, COCO50,03933–

18Eagle County, COCO54,29132–

19Delta County, COCO32,17828–

20Morgan County, COCO30,30624–

21Alamosa County, COCO16,68823–

22Clear Creek County, COCO8,99423–

23Garfield County, COCO63,47422–

24Chaffee County, COCO20,83121–

25Lake County, COCO7,55220–

26Montrose County, COCO44,59120–

27Pitkin County, COCO16,62517–

28Elbert County, COCO30,53417–

29Otero County, COCO17,68314–

30Montezuma County, COCO26,67813–

31Rio Grande County, COCO11,08712–

32Logan County, COCO20,65411–

33Routt County, COCO25,32911–

34Archuleta County, COCO14,30611–

35Ouray County, COCO5,26510–

36Grand County, COCO16,4969–

37Park County, COCO18,3148–

38Custer County, COCO5,5908–

39Prowers County, COCO11,8847–

40Crowley County, COCO5,6777–

41Phillips County, COCO4,4206–

42San Miguel County, COCO7,7536–

43Conejos County, COCO7,5296–

44Gunnison County, COCO17,4395–

45Huerfano County, COCO7,0114–

46Yuma County, COCO9,8964–

47Sedgwick County, COCO2,2474–

48Bent County, COCO5,7164–

49Kit Carson County, COCO7,0693–

50Las Animas County, COCO14,3913–

51Costilla County, COCO3,6793–

52Moffat County, COCO13,1223–

53Dolores County, COCO2,4662–

54Lincoln County, COCO5,6452–

55Saguache County, COCO6,7322–

56San Juan County, COCO8132–

57Rio Blanco County, COCO6,6832–

58Washington County, COCO4,7322–

59Baca County, COCO3,3471–

60Mineral County, COCO9101–

61Cheyenne County, COCO1,7131–

62Kiowa County, COCO1,4121–

63Jackson County, COCO1,2111–

64Hinsdale County, COCO7531–

SHOWING 1–64 OF 64

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES