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 2017, at 29.5%. Catron County had the lowest, at 11.3%. The median was 22.3% and the figure for New Mexico was 23.4%. Source: the U.S. Census Bureau.

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Highest29.5Lea County
Lowest11.3Catron County
Median22.333 counties
New Mexico23.4History

Map of counties, 2017

Bernalillo County: 22.1 %Catron County: 11.3 %Chaves County: 26.8 %Cibola County: 24.3 %Colfax County: 19.2 %Curry County: 27 %De Baca County: 20.6 %Doña Ana County: 24.8 %Eddy County: 26.2 %Grant County: 20.2 %Guadalupe County: 20.8 %Harding County: 14.3 %Hidalgo County: 23.1 %Lea County: 29.5 %Lincoln County: 18.1 %Los Alamos County: 23.1 %Luna County: 25.5 %McKinley County: 28.9 %Mora County: 18.2 %Otero County: 23.6 %Quay County: 22.3 %Rio Arriba County: 22.5 %Roosevelt County: 24.7 %Sandoval County: 24.2 %San Juan County: 27.5 %San Miguel County: 19.9 %Santa Fe County: 18.6 %Sierra County: 15.9 %Socorro County: 22.1 %Taos County: 18.4 %Torrance County: 21.3 %Union County: 19.5 %Valencia County: 24 %
  • Under 18
  • 18 to 20
  • 20 to 22
  • 22 to 24
  • 24 to 26
  • 26 and over
%, 2017. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2017

Lea County: 29.5 %Lea County29.5McKinley County: 28.9 %McKinley County28.9San Juan County: 27.5 %San Juan County27.5Curry County: 27 %Curry County27Chaves County: 26.8 %Chaves County26.8Eddy County: 26.2 %Eddy County26.2Luna County: 25.5 %Luna County25.5Doña Ana County: 24.8 %Doña Ana County24.8Roosevelt County: 24.7 %Roosevelt County24.7Cibola County: 24.3 %Cibola County24.3Sandoval County: 24.2 %Sandoval County24.2Valencia County: 24 %Valencia County24Otero County: 23.6 %Otero County23.6Los Alamos County: 23.1 %Los Alamos County23.1Hidalgo County: 23.1 %Hidalgo County23.1Rio Arriba County: 22.5 %Rio Arriba County22.5Quay County: 22.3 %Quay County22.3Bernalillo County: 22.1 %Bernalillo County22.1Socorro County: 22.1 %Socorro County22.1Torrance County: 21.3 %Torrance County21.3Guadalupe County: 20.8 %Guadalupe County20.8De Baca County: 20.6 %De Baca County20.6Grant County: 20.2 %Grant County20.2San Miguel County: 19.9 %San Miguel County19.9Union County: 19.5 %Union County19.5Colfax County: 19.2 %Colfax County19.2Santa Fe County: 18.6 %Santa Fe County18.6Taos County: 18.4 %Taos County18.4Mora County: 18.2 %Mora County18.2Lincoln County: 18.1 %Lincoln County18.1Sierra County: 15.9 %Sierra County15.9Harding County: 14.3 %Harding County14.3Catron County: 11.3 %Catron County11.3Lea County: 29.5 %Lea County29.5McKinley County: 28.9 %McKinley County28.9San Juan County: 27.5 %San Juan County27.5Curry County: 27 %Curry County27Chaves County: 26.8 %Chaves County26.8Eddy County: 26.2 %Eddy County26.2Luna County: 25.5 %Luna County25.5Doña Ana County: 24.8 %Doña Ana County24.8Roosevelt County: 24.7 %Roosevelt County24.7Cibola County: 24.3 %Cibola County24.3Sandoval County: 24.2 %Sandoval County24.2Valencia County: 24 %Valencia County24Otero County: 23.6 %Otero County23.6Los Alamos County: 23.1 %Los Alamos County23.1Hidalgo County: 23.1 %Hidalgo County23.1Rio Arriba County: 22.5 %Rio Arriba County22.5Quay County: 22.3 %Quay County22.3Bernalillo County: 22.1 %Bernalillo County22.1Socorro County: 22.1 %Socorro County22.1Torrance County: 21.3 %Torrance County21.3Guadalupe County: 20.8 %Guadalupe County20.8De Baca County: 20.6 %De Baca County20.6Grant County: 20.2 %Grant County20.2San Miguel County: 19.9 %San Miguel County19.9Union County: 19.5 %Union County19.5Colfax County: 19.2 %Colfax County19.2Santa Fe County: 18.6 %Santa Fe County18.6Taos County: 18.4 %Taos County18.4Mora County: 18.2 %Mora County18.2Lincoln County: 18.1 %Lincoln County18.1Sierra County: 15.9 %Sierra County15.9Harding County: 14.3 %Harding County14.3Catron County: 11.3 %Catron County11.3
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2017 (%)Change on 2016
1Lea County29.5-0.4 pts
2McKinley County28.9-0.3 pts
3San Juan County27.5-0.2 pts
4Curry County27-0 pts
5Chaves County26.8-0.2 pts
6Eddy County26.2-0.3 pts
7Luna County25.5-0.3 pts
8Doña Ana County24.8-0.3 pts
9Roosevelt County24.7-0.1 pts
10Cibola County24.3-0.2 pts
11Sandoval County24.2-0.3 pts
12Valencia County24-0.2 pts
13Otero County23.6-0.1 pts
14Los Alamos County23.1-0 pts
15Hidalgo County23.1+0.6 pts
16Rio Arriba County22.5-0.3 pts
17Quay County22.3+0.6 pts
18Bernalillo County22.1-0.3 pts
19Socorro County22.1-0.7 pts
20Torrance County21.3-0.2 pts
21Guadalupe County20.8+0.2 pts
22De Baca County20.6-0.3 pts
23Grant County20.2-0.4 pts
24San Miguel County19.9-0.3 pts
25Union County19.5+0.3 pts
26Colfax County19.2+0.2 pts
27Santa Fe County18.6-0.4 pts
28Taos County18.4-0.4 pts
29Mora County18.2-0.8 pts
30Lincoln County18.10 pts
31Sierra County15.9-0 pts
32Harding County14.3-0.5 pts
33Catron County11.3-0.3 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, 2017) [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, 2017. 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=2017. 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, 2017. 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=2017.

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, 2017 [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=2017 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_new_mexico_2017,
  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, 2017}},
  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=2017. 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, 2017
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=2017
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/new-mexico-counties?period=2017.
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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Rank Counties in New Mexico by population under 18 using official data, and cite the source.
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Questions

Which county has the highest population under 18?

Lea County, with 29.5% in 2017, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Catron County, with 11.3% in 2017.

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