RANKING · 2010 CENSUS · 64 SHOWN OF 64

Youngest by median age, Colorado counties · 2010

Colorado counties with the youngest median age (2010 ACS). This list covers the 64 counties in Colorado that qualify, ranked against each other statewide. The median across all 64 is 40.9.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDLargest foreign-born population Most residents with a disability Largest veteran population Most uninsured people Largest senior population Most unmarried people

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS 2000

01Adams County, COCO554,66832.4+3%

02Alamosa County, COCO16,68832.9+8%

03Weld County, COCO378,42633.1+7%

04Denver County, COCO740,61333.7+2%

05Eagle County, COCO54,29134.0+9%

06El Paso County, COCO757,04034.1+3%

07Gunnison County, COCO17,43934.3+13%

08Garfield County, COCO63,47434.5+1%

09Lake County, COCO7,55235.0+15%

10Larimer County, COCO377,29235.5+7%

11Arapahoe County, COCO673,82035.7+3%

12Boulder County, COCO328,56035.8+7%

13Moffat County, COCO13,12235.8+1%

14Morgan County, COCO30,30636.0+7%

15Broomfield County, COCO79,17436.4–

16Summit County, COCO31,51736.4+18%

17Douglas County, COCO399,39636.6+9%

18Prowers County, COCO11,88436.7+13%

19Rio Blanco County, COCO6,68338.0+1%

20Mesa County, COCO162,84538.10%

21Conejos County, COCO7,52938.2+12%

22La Plata County, COCO56,89838.4+8%

23Logan County, COCO20,65438.4+5%

24Yuma County, COCO9,89638.5+3%

25Pueblo County, COCO169,27738.7+5%

26Crowley County, COCO5,67738.9+6%

27Routt County, COCO25,32938.9+11%

28San Miguel County, COCO7,75339.3+15%

29Kit Carson County, COCO7,06939.7+6%

30Bent County, COCO5,71639.8+7%

31Jefferson County, COCO580,45140.4+10%

32Lincoln County, COCO5,64540.9+8%

33Otero County, COCO17,68340.9+8%

34Rio Grande County, COCO11,08741.0+10%

35Grand County, COCO16,49641.2+12%

36Montrose County, COCO44,59142.0+8%

37Pitkin County, COCO16,62542.0+9%

38Cheyenne County, COCO1,71342.7+13%

39Phillips County, COCO4,42042.8+8%

40Montezuma County, COCO26,67842.9+13%

41Saguache County, COCO6,73243.3+17%

42Fremont County, COCO50,03943.6+12%

43Elbert County, COCO30,53443.8+18%

44San Juan County, COCO81343.80%

45Las Animas County, COCO14,39143.9+7%

46Washington County, COCO4,73244.2+10%

47Dolores County, COCO2,46644.7+5%

48Delta County, COCO32,17845.6+8%

49Gilpin County, COCO6,07345.6+19%

50Clear Creek County, COCO8,99446.6+16%

51Park County, COCO18,31446.9+17%

52Teller County, COCO24,75647.0+19%

53Hinsdale County, COCO75347.1+7%

54Jackson County, COCO1,21147.3+17%

55Baca County, COCO3,34747.4+10%

56Chaffee County, COCO20,83147.4+13%

57Kiowa County, COCO1,41247.4+19%

58Archuleta County, COCO14,30648.4+19%

59Costilla County, COCO3,67949.0+16%

60Sedgwick County, COCO2,24749.2+14%

61Ouray County, COCO5,26550.0+15%

62Huerfano County, COCO7,01151.8+24%

63Mineral County, COCO91053.1+18%

64Custer County, COCO5,59053.3+19%

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