RANKING · 1990 CENSUS · 63 SHOWN OF 63

Youngest by median age, Colorado counties · 1990

Colorado counties with the youngest median age (2023 ACS). This list covers the 63 counties in Colorado that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDOldest by median age Most foreign-born residents Highest uninsured rate Most women Most men Highest disability rate

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS 2000

01Alamosa County, COCO16,68828.3−8%

02Gunnison County, COCO17,43928.4−7%

03El Paso County, COCO757,04030.3−8%

04Weld County, COCO378,42630.6−1%

05Eagle County, COCO54,29130.7−2%

06Summit County, COCO31,51730.9+0%

07Adams County, COCO554,66830.9−2%

08Lake County, COCO7,55231.0+2%

09Larimer County, COCO377,29231.2−6%

10Conejos County, COCO7,52931.3−8%

11Saguache County, COCO6,73231.5−15%

12Boulder County, COCO328,56031.6−5%

13Moffat County, COCO13,12231.8−10%

14La Plata County, COCO56,89831.8−11%

15Cheyenne County, COCO1,71331.9−16%

16Prowers County, COCO11,88432.2−1%

17Douglas County, COCO399,39632.3−4%

18Rio Blanco County, COCO6,68332.4−14%

19Arapahoe County, COCO673,82032.5−6%

20Routt County, COCO25,32932.6−7%

21Morgan County, COCO30,30632.6−3%

22Garfield County, COCO63,47432.9−4%

23Grand County, COCO16,49633.1−10%

24San Miguel County, COCO7,75333.2−3%

25Jefferson County, COCO580,45133.4−9%

26Elbert County, COCO30,53433.4−10%

27San Juan County, COCO81333.6−23%

28Rio Grande County, COCO11,08733.8−9%

29Montezuma County, COCO26,67833.8−11%

30Denver County, COCO740,61334.0+3%

31Crowley County, COCO5,67734.2−7%

32Teller County, COCO24,75634.6−12%

33Logan County, COCO20,65434.7−5%

34Pueblo County, COCO169,27734.7−5%

35Mesa County, COCO162,84534.7−9%

36Pitkin County, COCO16,62534.9−9%

37Otero County, COCO17,68335.0−7%

38Kit Carson County, COCO7,06935.0−6%

39Archuleta County, COCO14,30635.4−13%

40Costilla County, COCO3,67935.5−16%

41Jackson County, COCO1,21135.5−12%

42Park County, COCO18,31435.6−11%

43Clear Creek County, COCO8,99435.9−11%

44Yuma County, COCO9,89635.9−4%

45Gilpin County, COCO6,07336.2−6%

46Dolores County, COCO2,46636.4−14%

47Lincoln County, COCO5,64536.7−3%

48Kiowa County, COCO1,41236.9−7%

49Washington County, COCO4,73237.1−8%

50Montrose County, COCO44,59137.2−4%

51Chaffee County, COCO20,83137.4−11%

52Mineral County, COCO91037.6−16%

53Fremont County, COCO50,03937.8−3%

54Las Animas County, COCO14,39138.0−7%

55Phillips County, COCO4,42038.6−3%

56Hinsdale County, COCO75338.8−12%

57Baca County, COCO3,34739.1−9%

58Custer County, COCO5,59039.3−12%

59Huerfano County, COCO7,01139.5−5%

60Ouray County, COCO5,26539.8−8%

61Sedgwick County, COCO2,24740.8−6%

62Delta County, COCO32,17841.0−3%

63Bent County, COCO5,71641.2+10%

SHOWING 1–63 OF 63

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