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

Mineral County had the highest median age on 1 July (US county estimates) of 64 counties in 2014, at 56.5 years. Alamosa County had the lowest, at 32.9 years. The median was 41.1 years. Source: the U.S. Census Bureau.

Highest56.5Mineral County

Lowest32.9Alamosa County

Median41.164 counties

Map of counties, 2014

Under 36
36 to 39
39 to 41
41 to 46
46 to 49
49 and over

years, 2014. 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, 2014

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	2014 years	Change on 2013
1	Mineral County	56.5	+1.7
2	Custer County	55.9	+0.3
3	Huerfano County	54.9	+0.8
4	Hinsdale County	53.1	+1.5
5	Ouray County	52.7	+0.3
6	Costilla County	51.3	+0.6
7	Archuleta County	50.5	+0.4
8	Teller County	49.8	+0.6
9	Park County	49.7	+0.5
10	Chaffee County	49.1	+0.3
11	Dolores County	48.8	+1.8
12	Sedgwick County	48.5	-0.1
13	Clear Creek County	48.3	0
14	Jackson County	48.1	-0.4
15	Baca County	47.7	+0.1
16	Delta County	47.6	+0.6
17	San Juan County	47	+0.8
18	Las Animas County	46.7	+0.6
19	Saguache County	46.5	+0.9
20	Gilpin County	46.2	-0.5
21	Kiowa County	46.1	-0.3
22	Elbert County	45.6	+0.1
23	Fremont County	45	+0.3
24	Washington County	44.4	-0.1
25	Montrose County	44.3	+0.6
26	Montezuma County	44	+0.2
27	Grand County	43.5	-0.1
28	Pitkin County	43.1	+0.1
29	Phillips County	43	0
30	Cheyenne County	42.7	+1.4
31	Rio Grande County	41.5	+0.4
32	Bent County	41.2	+0.2
33	Otero County	40.9	-0.1
34	Jefferson County	40.7	-0.1
35	Routt County	40.2	0
35	San Miguel County	40.2	+0.3
37	Crowley County	40.1	-0.3
38	Lincoln County	40	-0.7
39	Pueblo County	39.8	+0.3
40	La Plata County	39.7	+0.4
41	Kit Carson County	39.4	+0.1
42	Mesa County	38.9	+0.3
43	Conejos County	38.7	+0.2
43	Logan County	38.7	-0.5
45	Yuma County	38.4	-0.1
46	Prowers County	38.2	+0.7
47	Douglas County	37.8	+0.2
48	Moffat County	37.7	+0.4
48	Summit County	37.7	+0.1
50	Broomfield County	37.6	+0.2
51	Rio Blanco County	37	0
52	Lake County	36.5	+0.3
53	Morgan County	36.4	+0.3
54	Boulder County	36.2	+0.2
55	Arapahoe County	36.1	+0.1
56	Garfield County	36	+0.3
56	Larimer County	36	+0.1
58	Eagle County	35.9	+0.2
59	Gunnison County	35.2	+0.3
60	El Paso County	34.1	+0.1
61	Denver County	33.9	0
61	Weld County	33.9	+0.1
63	Adams County	33.2	+0.2
64	Alamosa County	32.9	+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), 2014) [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), 2014. 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=2014. 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), 2014. 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=2014.

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), 2014 [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=2014 (Accessed: 12 October 2026).

BibTeX

@misc{census_counties_in_colorado_by_2014,
  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), 2014}},
  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=2014. 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), 2014
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=2014
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/colorado-counties?period=2014.
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)?

Mineral County, with 56.5 years in 2014, according to the U.S. Census Bureau.

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

Alamosa County, with 32.9 years in 2014.

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.