RANKING · 2020 CENSUS · 64 SHOWN OF 64

Oldest by median age, Colorado counties · 2020

Colorado counties ranked by median age of residents (2020 ACS). This list covers the 64 counties in Colorado that qualify, ranked against each other statewide.

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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

01Custer County, COCO5,59058.3+30%

02Mineral County, COCO91056.8+26%

03Hinsdale County, COCO75356.3+28%

04Huerfano County, COCO7,01156.0+34%

05Ouray County, COCO5,26554.6+26%

06Costilla County, COCO3,67952.2+24%

07Archuleta County, COCO14,30652.2+28%

08Teller County, COCO24,75651.6+31%

09Sedgwick County, COCO2,24749.6+15%

10Park County, COCO18,31449.5+24%

11Chaffee County, COCO20,83149.3+18%

12Dolores County, COCO2,46649.1+16%

13Delta County, COCO32,17848.9+16%

14Las Animas County, COCO14,39148.4+18%

15Clear Creek County, COCO8,99448.3+20%

16Jackson County, COCO1,21148.0+19%

17Gilpin County, COCO6,07347.7+25%

18San Juan County, COCO81347.5+9%

19Saguache County, COCO6,73247.0+27%

20Fremont County, COCO50,03946.1+19%

21Elbert County, COCO30,53445.9+23%

22Montrose County, COCO44,59145.5+17%

23Baca County, COCO3,34745.5+6%

24Montezuma County, COCO26,67845.3+19%

25Cheyenne County, COCO1,71344.0+16%

26Grand County, COCO16,49644.0+19%

27Kiowa County, COCO1,41244.0+11%

28Rio Grande County, COCO11,08743.8+17%

29Pitkin County, COCO16,62543.0+12%

30Washington County, COCO4,73242.5+6%

31Bent County, COCO5,71642.3+13%

32Crowley County, COCO5,67741.8+14%

33La Plata County, COCO56,89841.7+17%

34Routt County, COCO25,32941.6+19%

35Phillips County, COCO4,42041.4+4%

36Otero County, COCO17,68341.1+9%

37Conejos County, COCO7,52941.0+20%

38San Miguel County, COCO7,75341.0+20%

39Pueblo County, COCO169,27740.8+11%

40Mesa County, COCO162,84540.7+7%

41Jefferson County, COCO580,45140.3+10%

42Kit Carson County, COCO7,06940.2+7%

43Logan County, COCO20,65439.6+8%

44Lincoln County, COCO5,64539.2+4%

45Douglas County, COCO399,39639.1+16%

46Moffat County, COCO13,12238.6+9%

47Prowers County, COCO11,88438.1+18%

48Rio Blanco County, COCO6,68338.1+2%

49Summit County, COCO31,51738.1+24%

50Yuma County, COCO9,89638.0+2%

51Broomfield County, COCO79,17437.7–

52Boulder County, COCO328,56037.6+13%

53Eagle County, COCO54,29137.6+21%

54Larimer County, COCO377,29237.4+13%

55Gunnison County, COCO17,43937.3+23%

56Garfield County, COCO63,47436.8+8%

57Arapahoe County, COCO673,82036.6+6%

58Morgan County, COCO30,30636.5+9%

59Lake County, COCO7,55236.0+18%

60El Paso County, COCO757,04035.2+7%

61Alamosa County, COCO16,68835.0+14%

62Weld County, COCO378,42634.5+12%

63Adams County, COCO554,66834.4+10%

64Denver County, COCO740,61334.1+3%

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS