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.

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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, COCO81343.8+0%

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, COCO162,84538.1+0%

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