RANKING · 2024 ACS · 64 SHOWN OF 64

Youngest by median age, Colorado counties

Colorado counties with the youngest median age (2023 ACS). This list covers the 64 counties in Colorado that qualify, ranked against each other statewide.

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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, COCO16,68833.2+8%

02Adams County, COCO554,66834.8+11%

03El Paso County, COCO757,04035.1+6%

04Denver County, COCO740,61335.3+7%

05Weld County, COCO378,42635.3+14%

06Larimer County, COCO377,29236.8+11%

07Lake County, COCO7,55237.3+22%

08Arapahoe County, COCO673,82037.3+8%

09Gunnison County, COCO17,43937.5+23%

10Morgan County, COCO30,30637.5+12%

11San Juan County, COCO81337.5−14%

12Garfield County, COCO63,47437.6+10%

13Boulder County, COCO328,56037.7+13%

14Prowers County, COCO11,88437.7+16%

15Rio Blanco County, COCO6,68337.8+1%

16Broomfield County, COCO79,17438.6–

17Logan County, COCO20,65439.2+7%

18Kit Carson County, COCO7,06939.5+6%

19Summit County, COCO31,51739.5+28%

20Douglas County, COCO399,39639.6+18%

21Eagle County, COCO54,29139.7+27%

22Moffat County, COCO13,12240.1+13%

23Pueblo County, COCO169,27740.4+10%

24Jefferson County, COCO580,45140.5+10%

25Yuma County, COCO9,89640.5+9%

26Bent County, COCO5,71640.6+9%

27Conejos County, COCO7,52940.6+19%

28Crowley County, COCO5,67740.8+11%

29Lincoln County, COCO5,64540.9+8%

30Phillips County, COCO4,42040.9+3%

31Mesa County, COCO162,84541.3+8%

32Washington County, COCO4,73241.3+3%

33Rio Grande County, COCO11,08741.7+12%

34Otero County, COCO17,68341.8+11%

35Sedgwick County, COCO2,24742.6−1%

36Cheyenne County, COCO1,71342.9+13%

37Baca County, COCO3,34743.0+0%

38La Plata County, COCO56,89843.2+21%

39San Miguel County, COCO7,75343.3+27%

40Routt County, COCO25,32943.4+24%

41Montezuma County, COCO26,67844.5+17%

42Fremont County, COCO50,03944.7+15%

43Elbert County, COCO30,53445.0+21%

44Grand County, COCO16,49645.4+23%

45Kiowa County, COCO1,41245.4+14%

46Montrose County, COCO44,59146.1+19%

47Las Animas County, COCO14,39146.6+14%

48Gilpin County, COCO6,07347.2+23%

49Pitkin County, COCO16,62547.2+23%

50Delta County, COCO32,17848.1+14%

51Hinsdale County, COCO75348.5+10%

52Chaffee County, COCO20,83148.7+17%

53Clear Creek County, COCO8,99449.1+22%

54Saguache County, COCO6,73249.6+34%

55Costilla County, COCO3,67950.5+20%

56Park County, COCO18,31451.2+28%

57Jackson County, COCO1,21151.6+27%

58Archuleta County, COCO14,30652.1+28%

59Teller County, COCO24,75652.2+32%

60Huerfano County, COCO7,01155.3+33%

61Ouray County, COCO5,26555.4+28%

62Mineral County, COCO91056.4+25%

63Dolores County, COCO2,46656.7+34%

64Custer County, COCO5,59058.2+30%

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