RANKING · 2024 ACS · 64 SHOWN OF 64

Oldest by median age, Colorado counties

Colorado counties ranked by median age of residents (2024 ACS). This list covers the 64 counties in Colorado that qualify, ranked against each other statewide. The median across all 64 is 41.7. Biggest climber in the top 100 since 2020: Pitkin County, CO, up 12 places to #17.

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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, COCO5,59058.2+30%

02▲10Dolores County, COCO2,46656.7+34%

03▼1Mineral County, COCO91056.4+25%

04▲1Ouray County, COCO5,26555.4+28%

05▼1Huerfano County, COCO7,01155.3+33%

06▲2Teller County, COCO24,75652.2+32%

07Archuleta County, COCO14,30652.1+28%

08▲8Jackson County, COCO1,21151.6+27%

09▲1Park County, COCO18,31451.2+28%

10▼4Costilla County, COCO3,67950.5+20%

11▲8Saguache County, COCO6,73249.6+34%

12▲3Clear Creek County, COCO8,99449.1+22%

13▼2Chaffee County, COCO20,83148.7+17%

14▼11Hinsdale County, COCO75348.5+10%

15▼2Delta County, COCO32,17848.1+14%

16▲1Gilpin County, COCO6,07347.2+23%

17▲12Pitkin County, COCO16,62547.2+23%

18▼4Las Animas County, COCO14,39146.6+14%

19▲3Montrose County, COCO44,59146.1+19%

20▲6Grand County, COCO16,49645.4+23%

21▲6Kiowa County, COCO1,41245.4+14%

22▼1Elbert County, COCO30,53445.0+21%

23▼3Fremont County, COCO50,03944.7+15%

24Montezuma County, COCO26,67844.5+17%

25▲9Routt County, COCO25,32943.4+24%

26▲12San Miguel County, COCO7,75343.3+27%

27▲6La Plata County, COCO56,89843.2+21%

28▼5Baca County, COCO3,34743.00%

29▼4Cheyenne County, COCO1,71342.9+13%

30▼21Sedgwick County, COCO2,24742.6−1%

31▲5Otero County, COCO17,68341.8+11%

32▼4Rio Grande County, COCO11,08741.7+12%

33▲7Mesa County, COCO162,84541.3+8%

34▼4Washington County, COCO4,73241.3+3%

35▲9Lincoln County, COCO5,64540.9+8%

36▼1Phillips County, COCO4,42040.9+3%

37▼5Crowley County, COCO5,67740.8+11%

38▼7Bent County, COCO5,71640.6+9%

39▼2Conejos County, COCO7,52940.6+19%

40▲1Jefferson County, COCO580,45140.5+10%

41▲9Yuma County, COCO9,89640.5+9%

42▼3Pueblo County, COCO169,27740.4+10%

43▲3Moffat County, COCO13,12240.1+13%

44▲9Eagle County, COCO54,29139.7+27%

45Douglas County, COCO399,39639.6+18%

46▼4Kit Carson County, COCO7,06939.5+6%

47▲2Summit County, COCO31,51739.5+28%

48▼5Logan County, COCO20,65439.2+7%

49▲2Broomfield County, COCO79,17438.6–

50▼2Rio Blanco County, COCO6,68337.8+1%

51▲1Boulder County, COCO328,56037.7+13%

52▼5Prowers County, COCO11,88437.7+16%

53▲3Garfield County, COCO63,47437.6+10%

54▲1Gunnison County, COCO17,43937.5+23%

55▲3Morgan County, COCO30,30637.5+12%

56▼38San Juan County, COCO81337.5−14%

57▲2Lake County, COCO7,55237.3+22%

58▼1Arapahoe County, COCO673,82037.3+8%

59▼5Larimer County, COCO377,29236.8+11%

60▲4Denver County, COCO740,61335.3+7%

61▲1Weld County, COCO378,42635.3+14%

62▼2El Paso County, COCO757,04035.1+6%

63Adams County, COCO554,66834.8+11%

64▼3Alamosa County, COCO16,68833.2+8%

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES