RANKING · 2000 CENSUS · 63 SHOWN OF 63

Most densely populated, Colorado counties · 2000

Colorado counties ranked by residents per square mile (2000). This list covers the 63 counties in Colorado that qualify, ranked against each other statewide. The median across all 63 is 9.

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SAME RANKING BYCities States Metros

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 1990

01Denver County, COCO740,6133,623+19%

02Jefferson County, COCO580,451690+20%

03Arapahoe County, COCO673,820612+25%

04Boulder County, COCO328,560401+29%

05Adams County, COCO554,668312+37%

06El Paso County, COCO757,040243+30%

07Douglas County, COCO399,396209+191%

08Larimer County, COCO377,29297+35%

09Pueblo County, COCO169,27759+15%

10Weld County, COCO378,42645+37%

11Summit County, COCO31,51739+83%

12Teller County, COCO24,75637+65%

13Mesa County, COCO162,84535+25%

14Gilpin County, COCO6,07332+55%

15Fremont County, COCO50,03930+43%

16La Plata County, COCO56,89826+36%

17Eagle County, COCO54,29125+90%

18Delta County, COCO32,17824+33%

19Clear Creek County, COCO8,99424+22%

20Morgan County, COCO30,30621+24%

21Lake County, COCO7,55221+30%

22Alamosa County, COCO16,68821+10%

23Otero County, COCO17,68316+1%

24Chaffee County, COCO20,83116+28%

25Pitkin County, COCO16,62515+17%

26Montrose County, COCO44,59115+37%

27Garfield County, COCO63,47415+46%

28Rio Grande County, COCO11,08714+15%

29Montezuma County, COCO26,67812+28%

30Logan County, COCO20,65411+17%

31Elbert County, COCO30,53411+106%

32Prowers County, COCO11,8849+9%

33Routt County, COCO25,3298+40%

34Archuleta County, COCO14,3067+85%

35Crowley County, COCO5,6777+40%

36Ouray County, COCO5,2657+63%

37Grand County, COCO16,4967+56%

38Park County, COCO18,3147+102%

39Conejos County, COCO7,5297+13%

40Phillips County, COCO4,4207+7%

41San Miguel County, COCO7,7535+81%

42Sedgwick County, COCO2,2475+2%

43Huerfano County, COCO7,0115+31%

44Custer County, COCO5,5905+82%

45Gunnison County, COCO17,4394+36%

46Yuma County, COCO9,8964+10%

47Bent County, COCO5,7164+19%

48Kit Carson County, COCO7,0694+12%

49Las Animas County, COCO14,3913+10%

50Costilla County, COCO3,6793+15%

51Moffat County, COCO13,1223+16%

52Lincoln County, COCO5,6452+34%

53Washington County, COCO4,7322+2%

54Saguache County, COCO6,7322+28%

55Rio Blanco County, COCO6,68320%

56Baca County, COCO3,3472−1%

57Dolores County, COCO2,4662+23%

58San Juan County, COCO8131−25%

59Cheyenne County, COCO1,7131−7%

60Jackson County, COCO1,2111−2%

61Mineral County, COCO9101+49%

62Kiowa County, COCO1,4121−4%

63Hinsdale County, COCO7531+69%

SHOWING 1–63 OF 63

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