RANKING · 2020 CENSUS · 64 SHOWN OF 64

Youngest by median age, Colorado counties · 2020

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

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