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. 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

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