Counties in Colorado by median age on 1 July (US county estimates)

Custer County had the highest median age on 1 July (US county estimates) of 64 counties in 2023, at 56.8 years. Alamosa County had the lowest, at 34.2 years. The median was 42.7 years. Source: the U.S. Census Bureau.

Highest56.8Custer County

Lowest34.2Alamosa County

Median42.764 counties

Map of counties, 2023

Under 38
38 to 41
41 to 43
43 to 45
45 to 49
49 and over

years, 2023. Source: U.S. Census Bureau, Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2023

years. Source: U.S. Census Bureau, Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Retrieved 2026-10-12.

Full ranking

Rank	Counties	2023 years	Change on 2022
1	Custer County	56.8	-0.6
2	Hinsdale County	56.6	+0.1
3	Huerfano County	56	+0.2
4	Mineral County	55.8	-1.5
5	Ouray County	54.6	+0.4
6	Archuleta County	52.2	-0.1
7	Teller County	51.9	+0.6
8	Costilla County	50.9	-1.1
9	Park County	49.5	+0.1
10	Sedgwick County	49.3	-1.6
11	Jackson County	49.2	-1.2
12	Clear Creek County	48.6	+0.5
12	Delta County	48.6	0
14	Gilpin County	48.3	+0.6
15	Chaffee County	47.9	-0.5
16	Las Animas County	47.8	-0.3
16	Saguache County	47.8	+0.1
18	Dolores County	47.6	-0.1
19	San Juan County	45.9	+1.5
20	Montrose County	45.8	0
21	Fremont County	45.3	-0.1
22	Montezuma County	44.9	0
23	Grand County	44.6	0
23	Rio Grande County	44.6	+0.7
25	Baca County	44.5	-0.1
26	Elbert County	44.3	-0.5
27	Pitkin County	44.2	+0.1
28	Kiowa County	43.6	+0.6
29	La Plata County	43.2	+0.5
30	Cheyenne County	43	-0.2
31	Routt County	42.9	+0.2
32	San Miguel County	42.8	+0.3
33	Washington County	42.6	+0.2
34	Bent County	41.6	-0.4
34	Crowley County	41.6	-0.1
34	Mesa County	41.6	+0.3
37	Otero County	41.5	+0.2
38	Kit Carson County	40.8	+0.1
38	Pueblo County	40.8	+0.1
40	Jefferson County	40.6	0
40	Phillips County	40.6	-0.7
42	Conejos County	40.5	-0.1
42	Logan County	40.5	+0.3
44	Lincoln County	40.2	+0.2
44	Rio Blanco County	40.2	+0.5
46	Eagle County	39.7	+0.5
47	Douglas County	39.6	+0.1
48	Summit County	39.1	+0.3
49	Moffat County	38.9	+0.1
50	Broomfield County	38.4	+0.2
51	Boulder County	38.3	+0.1
52	Prowers County	38	-0.1
53	Larimer County	37.9	+0.2
54	Gunnison County	37.8	+0.2
55	Garfield County	37.6	+0.3
56	Yuma County	37.4	0
57	Arapahoe County	37	+0.1
58	Lake County	36.5	0
59	Morgan County	35.9	-0.3
60	El Paso County	35.4	+0.2
61	Adams County	34.9	+0.1
61	Weld County	34.9	0
63	Denver County	34.5	+0.1
64	Alamosa County	34.2	-0.1

Other periods

About this ranking

Age that divides the resident population of a US county into two halves of equal size on 1 July, from Census Bureau population estimates calculated by single year of age.

Counties only: the county file has no state or national medians, and medians cannot be added up. A single-year estimate, unlike median_age, which for US places is a five-year American Community Survey estimate.

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. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Census Bureau. (2026). Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage (Counties in Colorado by median age on 1 July (US county estimates), 2023) [Data set]. Retrieved October 12, 2026, from https://www.census.gov/programs-surveys/popest/data/data-sets.html

MLA 9

Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage, Counties in Colorado by median age on 1 July (US county estimates), 2023. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/colorado-counties?period=2023. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Counties in Colorado by median age on 1 July (US county estimates), 2023. Dataset. Accessed October 12, 2026. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Also distributed by Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/colorado-counties?period=2023.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage, Counties in Colorado by median age on 1 July (US county estimates), 2023 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/median-age-july-1-us-counties/colorado-counties?period=2023 (Accessed: 12 October 2026).

BibTeX

@misc{census_counties_in_colorado_by_2023,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: median age (MEDIAN\_AGE\_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage: Counties in Colorado by median age on 1 July (US county estimates), 2023}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.census.gov/programs-surveys/popest/data/data-sets.html},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/colorado-counties?period=2023. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN\_AGE\_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.},
}

RIS

TY  - DATA
AU  - U.S. Census Bureau
TI  - Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage: Counties in Colorado by median age on 1 July (US county estimates), 2023
PY  - 2026
DA  - 2026/06/25
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www.census.gov/programs-surveys/popest/data/data-sets.html
L2  - https://invokely.ai/rankings/median-age-july-1-us-counties/colorado-counties?period=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/colorado-counties?period=2023.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.
ER  -

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Questions

Which county has the highest median age on 1 July (US county estimates)?

Custer County, with 56.8 years in 2023, according to the U.S. Census Bureau.

Which county has the lowest median age on 1 July (US county estimates)?

Alamosa County, with 34.2 years in 2023.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Retrieved 2026-10-12.