RANKING · 2010 CENSUS · 64 SHOWN OF 64

Oldest by median age, Colorado counties · 2010

Colorado counties ranked by median age of residents (2010 ACS). This list covers the 64 counties in Colorado that qualify, ranked against each other statewide. The median across all 64 is 40.9.

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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, COCO5,59053.3+19%

02Mineral County, COCO91053.1+18%

03Huerfano County, COCO7,01151.8+24%

04Ouray County, COCO5,26550.0+15%

05Sedgwick County, COCO2,24749.2+14%

06Costilla County, COCO3,67949.0+16%

07Archuleta County, COCO14,30648.4+19%

08Baca County, COCO3,34747.4+10%

09Chaffee County, COCO20,83147.4+13%

10Kiowa County, COCO1,41247.4+19%

11Jackson County, COCO1,21147.3+17%

12Hinsdale County, COCO75347.1+7%

13Teller County, COCO24,75647.0+19%

14Park County, COCO18,31446.9+17%

15Clear Creek County, COCO8,99446.6+16%

16Delta County, COCO32,17845.6+8%

17Gilpin County, COCO6,07345.6+19%

18Dolores County, COCO2,46644.7+5%

19Washington County, COCO4,73244.2+10%

20Las Animas County, COCO14,39143.9+7%

21Elbert County, COCO30,53443.8+18%

22San Juan County, COCO81343.80%

23Fremont County, COCO50,03943.6+12%

24Saguache County, COCO6,73243.3+17%

25Montezuma County, COCO26,67842.9+13%

26Phillips County, COCO4,42042.8+8%

27Cheyenne County, COCO1,71342.7+13%

28Montrose County, COCO44,59142.0+8%

29Pitkin County, COCO16,62542.0+9%

30Grand County, COCO16,49641.2+12%

31Rio Grande County, COCO11,08741.0+10%

32Lincoln County, COCO5,64540.9+8%

33Otero County, COCO17,68340.9+8%

34Jefferson County, COCO580,45140.4+10%

35Bent County, COCO5,71639.8+7%

36Kit Carson County, COCO7,06939.7+6%

37San Miguel County, COCO7,75339.3+15%

38Crowley County, COCO5,67738.9+6%

39Routt County, COCO25,32938.9+11%

40Pueblo County, COCO169,27738.7+5%

41Yuma County, COCO9,89638.5+3%

42La Plata County, COCO56,89838.4+8%

43Logan County, COCO20,65438.4+5%

44Conejos County, COCO7,52938.2+12%

45Mesa County, COCO162,84538.10%

46Rio Blanco County, COCO6,68338.0+1%

47Prowers County, COCO11,88436.7+13%

48Douglas County, COCO399,39636.6+9%

49Broomfield County, COCO79,17436.4–

50Summit County, COCO31,51736.4+18%

51Morgan County, COCO30,30636.0+7%

52Boulder County, COCO328,56035.8+7%

53Moffat County, COCO13,12235.8+1%

54Arapahoe County, COCO673,82035.7+3%

55Larimer County, COCO377,29235.5+7%

56Lake County, COCO7,55235.0+15%

57Garfield County, COCO63,47434.5+1%

58Gunnison County, COCO17,43934.3+13%

59El Paso County, COCO757,04034.1+3%

60Eagle County, COCO54,29134.0+9%

61Denver County, COCO740,61333.7+2%

62Weld County, COCO378,42633.1+7%

63Alamosa County, COCO16,68832.9+8%

64Adams County, COCO554,66832.4+3%

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