RANKING · 2024 ACS · 64 SHOWN OF 64

Youngest by median age, Colorado counties

Colorado counties with the youngest median age (2024 ACS). This list covers the 64 counties in Colorado that qualify, ranked against each other statewide. The median across all 64 is 41.7. Biggest climber in the top 100 since 2020: San Juan County, CO, up 36 places to #11.

Flip the list · Oldest by median age, US counties →

ColoradoAll states All rankings

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

01▲3Alamosa County, COCO16,68833.2+8%

02Adams County, COCO554,66834.8+11%

03▲2El Paso County, COCO757,04035.1+6%

04▼3Denver County, COCO740,61335.3+7%

05▼2Weld County, COCO378,42635.3+14%

06▲5Larimer County, COCO377,29236.8+11%

07▼1Lake County, COCO7,55237.3+22%

08Arapahoe County, COCO673,82037.3+8%

09▲1Gunnison County, COCO17,43937.5+23%

10▼3Morgan County, COCO30,30637.5+12%

11▲36San Juan County, COCO81337.5−14%

12▼3Garfield County, COCO63,47437.6+10%

13▼1Boulder County, COCO328,56037.7+13%

14▲2Prowers County, COCO11,88437.7+16%

15▲2Rio Blanco County, COCO6,68337.8+1%

16▼2Broomfield County, COCO79,17438.6–

17▲5Logan County, COCO20,65439.2+7%

18▲5Kit Carson County, COCO7,06939.5+6%

19▼1Summit County, COCO31,51739.5+28%

20Douglas County, COCO399,39639.6+18%

21▼8Eagle County, COCO54,29139.7+27%

22▼3Moffat County, COCO13,12240.1+13%

23▲3Pueblo County, COCO169,27740.4+10%

24Jefferson County, COCO580,45140.5+10%

25▼10Yuma County, COCO9,89640.5+9%

26▲8Bent County, COCO5,71640.6+9%

27Conejos County, COCO7,52940.6+19%

28▲5Crowley County, COCO5,67740.8+11%

29▼8Lincoln County, COCO5,64540.9+8%

30Phillips County, COCO4,42040.9+3%

31▼6Mesa County, COCO162,84541.3+8%

32▲3Washington County, COCO4,73241.3+3%

33▲4Rio Grande County, COCO11,08741.7+12%

34▼5Otero County, COCO17,68341.8+11%

35▲21Sedgwick County, COCO2,24742.6−1%

36▲2Cheyenne County, COCO1,71342.9+13%

37▲6Baca County, COCO3,34743.00%

38▼6La Plata County, COCO56,89843.2+21%

39▼11San Miguel County, COCO7,75343.3+27%

40▼9Routt County, COCO25,32943.4+24%

41Montezuma County, COCO26,67844.5+17%

42▲3Fremont County, COCO50,03944.7+15%

43▲1Elbert County, COCO30,53445.0+21%

44▼5Grand County, COCO16,49645.4+23%

45▼5Kiowa County, COCO1,41245.4+14%

46▼4Montrose County, COCO44,59146.1+19%

47▲4Las Animas County, COCO14,39146.6+14%

48Gilpin County, COCO6,07347.2+23%

49▼13Pitkin County, COCO16,62547.2+23%

50▲2Delta County, COCO32,17848.1+14%

51▲11Hinsdale County, COCO75348.5+10%

52▲2Chaffee County, COCO20,83148.7+17%

53▼3Clear Creek County, COCO8,99449.1+22%

54▼8Saguache County, COCO6,73249.6+34%

55▲3Costilla County, COCO3,67950.5+20%

56▼1Park County, COCO18,31451.2+28%

57▼8Jackson County, COCO1,21151.6+27%

58▲1Archuleta County, COCO14,30652.1+28%

59▼2Teller County, COCO24,75652.2+32%

60▲1Huerfano County, COCO7,01155.3+33%

61▼1Ouray County, COCO5,26555.4+28%

62▲1Mineral County, COCO91056.4+25%

63▼10Dolores County, COCO2,46656.7+34%

64Custer County, COCO5,59058.2+30%

SHOWING 1–64 OF 64

Download CSV (full list, 64 rows)

UPDATED 2026-09-11 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES