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 2019, at 29.1%. Catron County had the lowest, at 10.3%. The median was 21.7% and the figure for New Mexico was 22.8%. Source: the U.S. Census Bureau.

Highest29.1Lea County
Lowest10.3Catron County
Median21.733 counties
New Mexico22.8History

All counties, 2019

Lea County: 29.1 %Lea County29.1McKinley County: 28 %McKinley County28Curry County: 26.7 %Curry County26.7San Juan County: 26.7 %San Juan County26.7Chaves County: 26.4 %Chaves County26.4Eddy County: 26.3 %Eddy County26.3Luna County: 24.9 %Luna County24.9Roosevelt County: 24.8 %Roosevelt County24.8Doña Ana County: 24.2 %Doña Ana County24.2Cibola County: 23.8 %Cibola County23.8Valencia County: 23.7 %Valencia County23.7Sandoval County: 23.6 %Sandoval County23.6Otero County: 23.1 %Otero County23.1Los Alamos County: 22.7 %Los Alamos County22.7Hidalgo County: 22.7 %Hidalgo County22.7Quay County: 22.2 %Quay County22.2Rio Arriba County: 21.7 %Rio Arriba County21.7Socorro County: 21.5 %Socorro County21.5Bernalillo County: 21.4 %Bernalillo County21.4De Baca County: 20.8 %De Baca County20.8Torrance County: 20.5 %Torrance County20.5Guadalupe County: 20.1 %Guadalupe County20.1Union County: 20 %Union County20San Miguel County: 19.4 %San Miguel County19.4Grant County: 19.2 %Grant County19.2Colfax County: 18.4 %Colfax County18.4Taos County: 17.8 %Taos County17.8Mora County: 17.7 %Mora County17.7Lincoln County: 17.7 %Lincoln County17.7Santa Fe County: 17.7 %Santa Fe County17.7Sierra County: 15.6 %Sierra County15.6Harding County: 13.8 %Harding County13.8Catron County: 10.3 %Catron County10.3
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2019 (%)Change on 2018
1Lea County29.1-0.1 pts
2McKinley County28-0.4 pts
3Curry County26.7-0.1 pts
4San Juan County26.7-0.4 pts
5Chaves County26.4-0.3 pts
6Eddy County26.3+0.2 pts
7Luna County24.9-0 pts
8Roosevelt County24.8-0.1 pts
9Doña Ana County24.2-0.2 pts
10Cibola County23.8-0.2 pts
11Valencia County23.7-0.2 pts
12Sandoval County23.6-0.3 pts
13Otero County23.1-0.4 pts
14Los Alamos County22.7-0.1 pts
15Hidalgo County22.7-0.2 pts
16Quay County22.2-0.1 pts
17Rio Arriba County21.7-0.4 pts
18Socorro County21.5-0.2 pts
19Bernalillo County21.4-0.4 pts
20De Baca County20.8-0.5 pts
21Torrance County20.5-0.4 pts
22Guadalupe County20.1-0.5 pts
23Union County20-0.2 pts
24San Miguel County19.4-0 pts
25Grant County19.2-0.6 pts
26Colfax County18.4-0.5 pts
27Taos County17.8-0.3 pts
28Mora County17.7-0.6 pts
29Lincoln County17.7-0.1 pts
30Santa Fe County17.7-0.4 pts
31Sierra County15.6-0.1 pts
32Harding County13.8-0.5 pts
33Catron County10.3-0.4 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, 2019) [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, 2019. 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=2019. 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, 2019. 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=2019.

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, 2019 [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=2019 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_new_mexico_2019,
  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, 2019}},
  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=2019. 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, 2019
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=2019
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/new-mexico-counties?period=2019.
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 2019, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Catron County, with 10.3% in 2019.

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