Counties in Colorado by median age

Name: Counties in Colorado by median age, 2021
Creator: U.S. Census Bureau
License: Public domain (US federal government work, citation requested)

Custer County had the highest median age of 64 counties in 2021, at 59 years. Alamosa County had the lowest, at 32.9 years. The median was 41 years and the figure for Colorado was 37.1 years. Source: the U.S. Census Bureau.

Highest59Custer County

Lowest32.9Alamosa County

Median4164 counties

Colorado37.1History

Top 40 counties, 2021

CSV Chart (SVG)

years. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

Rank	Counties	2021 years
1	Custer County	59
2	Dolores County	58.6
3	Hinsdale County	56.9
4	Huerfano County	55.4
5	Jackson County	55
6	Ouray County	54.4
7	Costilla County	51.7
8	Park County	51.3
9	Mineral County	50.8
10	Teller County	50.4
11	Archuleta County	50
12	Saguache County	49.6
13	Clear Creek County	49.5
14	Gilpin County	49.2
15	Chaffee County	49
16	Delta County	47.6
17	Las Animas County	46.4
18	Elbert County	46.2
19	Pitkin County	45.9
20	Montrose County	45.6
21	San Juan County	45.2
22	Montezuma County	45
23	Fremont County	44.8
24	Grand County	43.6
25	Sedgwick County	43.5
26	Baca County	43.2
27	San Miguel County	42.1
28	Cheyenne County	42
29	Kiowa County	41.6
30	Routt County	41.5
31	La Plata County	41.3
32	Washington County	41
33	Bent County	40.9
34	Rio Grande County	40.7
35	Mesa County	40.3
36	Jefferson County	40.2
37	Otero County	40.1
38	Pueblo County	39.5
39	Douglas County	39.1
40	Kit Carson County	38.9
41	Conejos County	38.7
42	Summit County	38.6
43	Broomfield County	38.4
43	Lincoln County	38.4
45	Logan County	38.1
45	Yuma County	38.1
47	Prowers County	37.9
48	Eagle County	37.8
48	Phillips County	37.8
50	Crowley County	37.5
50	Rio Blanco County	37.5
52	Moffat County	37.4
53	Boulder County	37.2
54	Arapahoe County	37
55	Garfield County	36.8
56	Larimer County	36.3
57	Gunnison County	36.1
57	Morgan County	36.1
59	Lake County	35.4
60	Denver County	34.8
60	Weld County	34.8
62	El Paso County	34.6
63	Adams County	34.2
64	Alamosa County	32.9

Other periods

2024
2023
2022
2021

About this ranking

Age that divides the resident population into two halves of equal size. Spain and the EU: on 1 January. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. American Community Survey 5-year estimates, table B01002: median age, total population. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b01002.dat. Retrieved 2026-10-08.

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Rank Counties in Colorado by median age using official data, and cite the source.

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Questions

Which county has the highest median age?

Custer County, with 59 years in 2021, according to the U.S. Census Bureau.

Which county has the lowest median age?

Alamosa County, with 32.9 years in 2021.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, American Community Survey 5-year estimates, table B01002: median age, total population. Retrieved 2026-10-08.