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 2018, at 29.1%. Catron County had the lowest, at 10.6%. The median was 22.1% and the figure for New Mexico was 23.1%. Source: the U.S. Census Bureau.

Highest29.1Lea County
Lowest10.6Catron County
Median22.133 counties
New Mexico23.1History

All counties, 2018

Lea County: 29.1 %Lea County29.1McKinley County: 28.4 %McKinley County28.4San Juan County: 27 %San Juan County27Curry County: 26.8 %Curry County26.8Chaves County: 26.7 %Chaves County26.7Eddy County: 26.1 %Eddy County26.1Luna County: 24.9 %Luna County24.9Roosevelt County: 24.9 %Roosevelt County24.9Doña Ana County: 24.4 %Doña Ana County24.4Sandoval County: 24 %Sandoval County24Valencia County: 23.9 %Valencia County23.9Cibola County: 23.9 %Cibola County23.9Otero County: 23.5 %Otero County23.5Los Alamos County: 22.8 %Los Alamos County22.8Hidalgo County: 22.8 %Hidalgo County22.8Quay County: 22.2 %Quay County22.2Rio Arriba County: 22.1 %Rio Arriba County22.1Bernalillo County: 21.8 %Bernalillo County21.8Socorro County: 21.7 %Socorro County21.7De Baca County: 21.3 %De Baca County21.3Torrance County: 21 %Torrance County21Guadalupe County: 20.5 %Guadalupe County20.5Union County: 20.2 %Union County20.2Grant County: 19.8 %Grant County19.8San Miguel County: 19.5 %San Miguel County19.5Colfax County: 18.9 %Colfax County18.9Mora County: 18.3 %Mora County18.3Santa Fe County: 18.1 %Santa Fe County18.1Taos County: 18.1 %Taos County18.1Lincoln County: 17.8 %Lincoln County17.8Sierra County: 15.8 %Sierra County15.8Harding County: 14.4 %Harding County14.4Catron County: 10.6 %Catron County10.6
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2018 (%)Change on 2017
1Lea County29.1-0.3 pts
2McKinley County28.4-0.5 pts
3San Juan County27-0.5 pts
4Curry County26.8-0.2 pts
5Chaves County26.7-0.2 pts
6Eddy County26.1-0 pts
7Luna County24.9-0.5 pts
7Roosevelt County24.9+0.3 pts
9Doña Ana County24.4-0.3 pts
10Sandoval County24-0.2 pts
11Valencia County23.9-0.1 pts
12Cibola County23.9-0.3 pts
13Otero County23.5-0.1 pts
14Los Alamos County22.8-0.2 pts
15Hidalgo County22.8-0.2 pts
16Quay County22.2-0 pts
17Rio Arriba County22.1-0.4 pts
18Bernalillo County21.8-0.3 pts
19Socorro County21.7-0.4 pts
20De Baca County21.3+0.7 pts
21Torrance County21-0.3 pts
22Guadalupe County20.5-0.2 pts
23Union County20.2+0.7 pts
24Grant County19.8-0.4 pts
25San Miguel County19.5-0.4 pts
26Colfax County18.9-0.4 pts
27Mora County18.3+0.1 pts
28Santa Fe County18.1-0.5 pts
29Taos County18.1-0.4 pts
30Lincoln County17.8-0.2 pts
31Sierra County15.8-0.1 pts
32Harding County14.4+0.1 pts
33Catron County10.6-0.7 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, 2018) [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, 2018. 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=2018. 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, 2018. 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=2018.

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, 2018 [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=2018 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_new_mexico_2018,
  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, 2018}},
  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=2018. 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, 2018
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=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/new-mexico-counties?period=2018.
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 29.1% in 2018, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Catron County, with 10.6% in 2018.

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