Data / Rankings / Population under 18 / Counties in New Mexico

Counties in New Mexico by population under 18, 2025

Lea County had the highest population under 18 of 33 counties in 2025, at 27.8%. Catron County had the lowest, at 10.9%. The median was 20.4% and the figure for New Mexico was 20.7%. Source: the U.S. Census Bureau.

Highest27.8Lea County
Lowest10.9Catron County
Median20.433 counties
New Mexico20.7History

All counties, 2025

Lea County: 27.8 %Lea County27.8Curry County: 26.2 %Curry County26.2Luna County: 25 %Luna County25Eddy County: 24.8 %Eddy County24.8McKinley County: 24.7 %McKinley County24.7Chaves County: 24.2 %Chaves County24.2San Juan County: 24 %San Juan County24Roosevelt County: 23.2 %Roosevelt County23.2Valencia County: 22.5 %Valencia County22.5Cibola County: 22.4 %Cibola County22.4Doña Ana County: 21.9 %Doña Ana County21.9Hidalgo County: 21.6 %Hidalgo County21.6Otero County: 21.2 %Otero County21.2Sandoval County: 20.7 %Sandoval County20.7Torrance County: 20.7 %Torrance County20.7Los Alamos County: 20.6 %Los Alamos County20.6Quay County: 20.4 %Quay County20.4Rio Arriba County: 20.4 %Rio Arriba County20.4Socorro County: 19.4 %Socorro County19.4Union County: 19.1 %Union County19.1Bernalillo County: 19.1 %Bernalillo County19.1De Baca County: 19 %De Baca County19Guadalupe County: 17.9 %Guadalupe County17.9San Miguel County: 17.3 %San Miguel County17.3Grant County: 17.2 %Grant County17.2Lincoln County: 16.5 %Lincoln County16.5Colfax County: 16.4 %Colfax County16.4Mora County: 15.7 %Mora County15.7Sierra County: 15.4 %Sierra County15.4Taos County: 15.1 %Taos County15.1Santa Fe County: 14.9 %Santa Fe County14.9Harding County: 12.8 %Harding County12.8Catron County: 10.9 %Catron County10.9
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2025 (%)Change on 2024
1Lea County27.8-0.5 pts
2Curry County26.2-0.3 pts
3Luna County25-0.1 pts
4Eddy County24.8-0.4 pts
5McKinley County24.7-0.6 pts
6Chaves County24.2-0.6 pts
7San Juan County24-0.5 pts
8Roosevelt County23.2-0.2 pts
9Valencia County22.5-0.3 pts
10Cibola County22.4-0.3 pts
11Doña Ana County21.9-0.5 pts
12Hidalgo County21.6-0.4 pts
13Otero County21.2-0.4 pts
14Sandoval County20.7-0.6 pts
15Torrance County20.7+0.1 pts
16Los Alamos County20.6-0.2 pts
17Quay County20.4-0.2 pts
18Rio Arriba County20.4-0.5 pts
19Socorro County19.4-0.6 pts
20Union County19.1-0.5 pts
21Bernalillo County19.1-0.5 pts
22De Baca County19-0.8 pts
23Guadalupe County17.9+0.1 pts
24San Miguel County17.3-0.2 pts
25Grant County17.2-0.1 pts
26Lincoln County16.5-0.2 pts
27Colfax County16.4-0.4 pts
28Mora County15.7-0.5 pts
29Sierra County15.4-0 pts
30Taos County15.1-0.4 pts
31Santa Fe County14.9-0.4 pts
32Harding County12.8-0.6 pts
33Catron County10.9+0.2 pts

Other periods

About this ranking

Residents aged 0 to 17 as a percentage of total population on 1 July. United States: Census Bureau county population estimates by age; states and the nation are sums of their counties.

Uses the US age of majority. Not comparable with population_0_14_share, which stops at 14.

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: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. 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: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties (Counties in New Mexico by population under 18, 2025) [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: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties, Counties in New Mexico by population under 18, 2025. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/population-under-18/new-mexico-counties. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. Counties in New Mexico by population under 18, 2025. Dataset. Accessed October 12, 2026. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Also distributed by Invokely, https://invokely.ai/rankings/population-under-18/new-mexico-counties.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties, Counties in New Mexico by population under 18, 2025 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-under-18/new-mexico-counties (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_new_mexico_2025,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties: Counties in New Mexico by population under 18, 2025}},
  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/population-under-18/new-mexico-counties. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. 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: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties: Counties in New Mexico by population under 18, 2025
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/population-under-18/new-mexico-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/new-mexico-counties.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. 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 population under 18?

Lea County, with 27.8% in 2025, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Catron County, with 10.9% in 2025.

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: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. Retrieved 2026-10-12.

Population under 18: other rankings

Counties in New Mexico: more rankings