RANKING · 1990 CENSUS · 63 SHOWN OF 63

Oldest by median age, Colorado counties · 1990

Colorado counties ranked by median age of residents (1990 ACS). This list covers the 63 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 –

01Bent County, COCO5,71641.2–

02Delta County, COCO32,17841.0–

03Sedgwick County, COCO2,24740.8–

04Ouray County, COCO5,26539.8–

05Huerfano County, COCO7,01139.5–

06Custer County, COCO5,59039.3–

07Baca County, COCO3,34739.1–

08Hinsdale County, COCO75338.8–

09Phillips County, COCO4,42038.6–

10Las Animas County, COCO14,39138.0–

11Fremont County, COCO50,03937.8–

12Mineral County, COCO91037.6–

13Chaffee County, COCO20,83137.4–

14Montrose County, COCO44,59137.2–

15Washington County, COCO4,73237.1–

16Kiowa County, COCO1,41236.9–

17Lincoln County, COCO5,64536.7–

18Dolores County, COCO2,46636.4–

19Gilpin County, COCO6,07336.2–

20Yuma County, COCO9,89635.9–

21Clear Creek County, COCO8,99435.9–

22Park County, COCO18,31435.6–

23Jackson County, COCO1,21135.5–

24Costilla County, COCO3,67935.5–

25Archuleta County, COCO14,30635.4–

26Kit Carson County, COCO7,06935.0–

27Otero County, COCO17,68335.0–

28Pitkin County, COCO16,62534.9–

29Mesa County, COCO162,84534.7–

30Pueblo County, COCO169,27734.7–

31Logan County, COCO20,65434.7–

32Teller County, COCO24,75634.6–

33Crowley County, COCO5,67734.2–

34Denver County, COCO740,61334.0–

35Montezuma County, COCO26,67833.8–

36Rio Grande County, COCO11,08733.8–

37San Juan County, COCO81333.6–

38Elbert County, COCO30,53433.4–

39Jefferson County, COCO580,45133.4–

40San Miguel County, COCO7,75333.2–

41Grand County, COCO16,49633.1–

42Garfield County, COCO63,47432.9–

43Morgan County, COCO30,30632.6–

44Routt County, COCO25,32932.6–

45Arapahoe County, COCO673,82032.5–

46Rio Blanco County, COCO6,68332.4–

47Douglas County, COCO399,39632.3–

48Prowers County, COCO11,88432.2–

49Cheyenne County, COCO1,71331.9–

50La Plata County, COCO56,89831.8–

51Moffat County, COCO13,12231.8–

52Boulder County, COCO328,56031.6–

53Saguache County, COCO6,73231.5–

54Conejos County, COCO7,52931.3–

55Larimer County, COCO377,29231.2–

56Lake County, COCO7,55231.0–

57Adams County, COCO554,66830.9–

58Summit County, COCO31,51730.9–

59Eagle County, COCO54,29130.7–

60Weld County, COCO378,42630.6–

61El Paso County, COCO757,04030.3–

62Gunnison County, COCO17,43928.4–

63Alamosa County, COCO16,68828.3–

SHOWING 1–63 OF 63

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