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

Counties in New Mexico by population under 18

Lea County had the highest population under 18 of 33 counties in 2023, at 28.5%. Catron County had the lowest, at 10.4%. The median was 21% and the figure for New Mexico was 21.5%. Source: the U.S. Census Bureau.

Highest28.5Lea County
Lowest10.4Catron County
Median2133 counties
New Mexico21.5History

All counties, 2023

Lea County: 28.5 %Lea County28.5Curry County: 26.7 %Curry County26.7McKinley County: 26 %McKinley County26Eddy County: 25.6 %Eddy County25.6Chaves County: 25.3 %Chaves County25.3San Juan County: 25.1 %San Juan County25.1Luna County: 25 %Luna County25Roosevelt County: 23.6 %Roosevelt County23.6Cibola County: 23.1 %Cibola County23.1Valencia County: 23 %Valencia County23Doña Ana County: 22.8 %Doña Ana County22.8Otero County: 22.1 %Otero County22.1Sandoval County: 21.9 %Sandoval County21.9Hidalgo County: 21.3 %Hidalgo County21.3Quay County: 21.2 %Quay County21.2Rio Arriba County: 21.1 %Rio Arriba County21.1Los Alamos County: 21 %Los Alamos County21Torrance County: 20.6 %Torrance County20.6Socorro County: 20.3 %Socorro County20.3Bernalillo County: 19.9 %Bernalillo County19.9De Baca County: 19.7 %De Baca County19.7Union County: 19.2 %Union County19.2San Miguel County: 17.8 %San Miguel County17.8Guadalupe County: 17.6 %Guadalupe County17.6Grant County: 17.5 %Grant County17.5Lincoln County: 17 %Lincoln County17Colfax County: 17 %Colfax County17Mora County: 16.5 %Mora County16.5Taos County: 16 %Taos County16Sierra County: 15.8 %Sierra County15.8Santa Fe County: 15.8 %Santa Fe County15.8Harding County: 14.2 %Harding County14.2Catron County: 10.4 %Catron County10.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1Lea County28.5-0.2 pts
2Curry County26.7-0.2 pts
3McKinley County26-0.6 pts
4Eddy County25.6-0.2 pts
5Chaves County25.3-0.4 pts
6San Juan County25.1-0.6 pts
7Luna County25-0.1 pts
8Roosevelt County23.6-0.6 pts
9Cibola County23.1-0.3 pts
10Valencia County23-0.2 pts
11Doña Ana County22.8-0.5 pts
12Otero County22.1-0.5 pts
13Sandoval County21.9-0.4 pts
14Hidalgo County21.3-0.7 pts
15Quay County21.2-0 pts
16Rio Arriba County21.1-0.3 pts
17Los Alamos County21-0.3 pts
18Torrance County20.6-0.2 pts
19Socorro County20.3-0.4 pts
20Bernalillo County19.9-0.4 pts
21De Baca County19.7-0.1 pts
22Union County19.2-0.4 pts
23San Miguel County17.8-0.5 pts
24Guadalupe County17.60 pts
25Grant County17.5-0.5 pts
26Lincoln County17-0.4 pts
27Colfax County17-0.1 pts
28Mora County16.5+0.1 pts
29Taos County16-0.5 pts
30Sierra County15.8+0.2 pts
31Santa Fe County15.8-0.5 pts
32Harding County14.2+0.6 pts
33Catron County10.4-0.6 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, 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: 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, 2023. 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?period=2023. 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, 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/population-under-18/new-mexico-counties?period=2023.

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, 2023 [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?period=2023 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_new_mexico_2023,
  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, 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/population-under-18/new-mexico-counties?period=2023. 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, 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/population-under-18/new-mexico-counties?period=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/new-mexico-counties?period=2023.
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 28.5% in 2023, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Catron County, with 10.4% 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: 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