Data / Rankings / Median age / Counties in New Mexico

Counties in New Mexico by median age

Catron County had the highest median age of 33 counties in 2021, at 59.8 years. De Baca County had the lowest, at 27.3 years. The median was 40.4 years and the figure for New Mexico was 38.3 years. Source: the U.S. Census Bureau.

Highest59.8Catron County
Lowest27.3De Baca County
Median40.433 counties
New Mexico38.3History

All counties, 2021

CSVChart (SVG)

Catron CountyCatron County: 59.8 years59.8Mora CountyMora County: 58.9 years58.9Sierra CountySierra County: 55.3 years55.3Lincoln CountyLincoln County: 52.6 years52.6Colfax CountyColfax County: 49.6 years49.6Taos CountyTaos County: 49.4 years49.4Grant CountyGrant County: 47.2 years47.2Santa Fe CountySanta Fe County: 47.1 years47.1San Miguel CountySan Miguel County: 44.7 years44.7Quay CountyQuay County: 44.5 years44.5Harding CountyHarding County: 43.9 years43.9Hidalgo CountyHidalgo County: 43 years43Torrance CountyTorrance County: 42.9 years42.9Los Alamos CountyLos Alamos County: 41.5 years41.5Rio Arriba CountyRio Arriba County: 41.5 years41.5Guadalupe CountyGuadalupe County: 40.7 years40.7Sandoval CountySandoval County: 40.4 years40.4Socorro CountySocorro County: 40 years40Union CountyUnion County: 39.7 years39.7Cibola CountyCibola County: 39.4 years39.4Valencia CountyValencia County: 39 years39Bernalillo CountyBernalillo County: 38.3 years38.3Luna CountyLuna County: 36.5 years36.5Otero CountyOtero County: 36.5 years36.5San Juan CountySan Juan County: 36.4 years36.4Chaves CountyChaves County: 36.1 years36.1Eddy CountyEddy County: 35.5 years35.5Doña Ana CountyDoña Ana County: 33.4 years33.4McKinley CountyMcKinley County: 33.3 years33.3Lea CountyLea County: 31.9 years31.9Curry CountyCurry County: 31.7 years31.7Roosevelt CountyRoosevelt County: 30.6 years30.6De Baca CountyDe Baca County: 27.3 years27.3
years. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2021
years
1Catron County59.8
2Mora County58.9
3Sierra County55.3
4Lincoln County52.6
5Colfax County49.6
6Taos County49.4
7Grant County47.2
8Santa Fe County47.1
9San Miguel County44.7
10Quay County44.5
11Harding County43.9
12Hidalgo County43
13Torrance County42.9
14Los Alamos County41.5
14Rio Arriba County41.5
16Guadalupe County40.7
17Sandoval County40.4
18Socorro County40
19Union County39.7
20Cibola County39.4
21Valencia County39
22Bernalillo County38.3
23Luna County36.5
23Otero County36.5
25San Juan County36.4
26Chaves County36.1
27Eddy County35.5
28Doña Ana County33.4
29McKinley County33.3
30Lea County31.9
31Curry County31.7
32Roosevelt County30.6
33De Baca County27.3

Other periods

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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Questions

Which county has the highest median age?

Catron County, with 59.8 years in 2021, according to the U.S. Census Bureau.

Which county has the lowest median age?

De Baca County, with 27.3 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.

Median age: other rankings

Counties in New Mexico: more rankings