RANKING · 2020 CENSUS · 64 SHOWN OF 64

Youngest by median age, Colorado counties · 2020

Colorado counties with the youngest median age (2020 ACS). This list covers the 64 counties in Colorado that qualify, ranked against each other statewide. The median across all 64 is 41.8.

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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

01Denver County, COCO740,61334.1+3%

02Adams County, COCO554,66834.4+10%

03Weld County, COCO378,42634.5+12%

04Alamosa County, COCO16,68835.0+14%

05El Paso County, COCO757,04035.2+7%

06Lake County, COCO7,55236.0+18%

07Morgan County, COCO30,30636.5+9%

08Arapahoe County, COCO673,82036.6+6%

09Garfield County, COCO63,47436.8+8%

10Gunnison County, COCO17,43937.3+23%

11Larimer County, COCO377,29237.4+13%

12Boulder County, COCO328,56037.6+13%

13Eagle County, COCO54,29137.6+21%

14Broomfield County, COCO79,17437.7–

15Yuma County, COCO9,89638.0+2%

16Prowers County, COCO11,88438.1+18%

17Rio Blanco County, COCO6,68338.1+2%

18Summit County, COCO31,51738.1+24%

19Moffat County, COCO13,12238.6+9%

20Douglas County, COCO399,39639.1+16%

21Lincoln County, COCO5,64539.2+4%

22Logan County, COCO20,65439.6+8%

23Kit Carson County, COCO7,06940.2+7%

24Jefferson County, COCO580,45140.3+10%

25Mesa County, COCO162,84540.7+7%

26Pueblo County, COCO169,27740.8+11%

27Conejos County, COCO7,52941.0+20%

28San Miguel County, COCO7,75341.0+20%

29Otero County, COCO17,68341.1+9%

30Phillips County, COCO4,42041.4+4%

31Routt County, COCO25,32941.6+19%

32La Plata County, COCO56,89841.7+17%

33Crowley County, COCO5,67741.8+14%

34Bent County, COCO5,71642.3+13%

35Washington County, COCO4,73242.5+6%

36Pitkin County, COCO16,62543.0+12%

37Rio Grande County, COCO11,08743.8+17%

38Cheyenne County, COCO1,71344.0+16%

39Grand County, COCO16,49644.0+19%

40Kiowa County, COCO1,41244.0+11%

41Montezuma County, COCO26,67845.3+19%

42Montrose County, COCO44,59145.5+17%

43Baca County, COCO3,34745.5+6%

44Elbert County, COCO30,53445.9+23%

45Fremont County, COCO50,03946.1+19%

46Saguache County, COCO6,73247.0+27%

47San Juan County, COCO81347.5+9%

48Gilpin County, COCO6,07347.7+25%

49Jackson County, COCO1,21148.0+19%

50Clear Creek County, COCO8,99448.3+20%

51Las Animas County, COCO14,39148.4+18%

52Delta County, COCO32,17848.9+16%

53Dolores County, COCO2,46649.1+16%

54Chaffee County, COCO20,83149.3+18%

55Park County, COCO18,31449.5+24%

56Sedgwick County, COCO2,24749.6+15%

57Teller County, COCO24,75651.6+31%

58Costilla County, COCO3,67952.2+24%

59Archuleta County, COCO14,30652.2+28%

60Ouray County, COCO5,26554.6+26%

61Huerfano County, COCO7,01156.0+34%

62Hinsdale County, COCO75356.3+28%

63Mineral County, COCO91056.8+26%

64Custer County, COCO5,59058.3+30%

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