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

Counties in New York by population under 18, 2025

Rockland County had the highest population under 18 of 62 counties in 2025, at 31.1%. Hamilton County had the lowest, at 11.4%. The median was 19.2% and the figure for New York was 19.5%. Source: the U.S. Census Bureau.

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Highest31.1Rockland County
Lowest11.4Hamilton County
Median19.262 counties
New York19.5History

Map of counties, 2025

Albany County: 17.5 %Allegany County: 19.5 %Bronx County: 23.5 %Broome County: 17.9 %Cattaraugus County: 20.8 %Cayuga County: 18.5 %Chautauqua County: 19.9 %Chemung County: 19.8 %Chenango County: 20.3 %Clinton County: 17.6 %Columbia County: 14.9 %Cortland County: 17.7 %Delaware County: 15.6 %Dutchess County: 17.8 %Erie County: 19.4 %Essex County: 14.9 %Franklin County: 19.3 %Fulton County: 18.7 %Genesee County: 18.6 %Greene County: 16 %Hamilton County: 11.4 %Herkimer County: 19.9 %Jefferson County: 23.2 %Kings County: 20.7 %Lewis County: 22.4 %Livingston County: 17.5 %Madison County: 18.3 %Monroe County: 19.3 %Montgomery County: 23.4 %Nassau County: 20.6 %New York County: 12.9 %Niagara County: 19.1 %Oneida County: 20.7 %Onondaga County: 19.9 %Ontario County: 18.4 %Orange County: 25 %Orleans County: 18.7 %Oswego County: 20.1 %Otsego County: 15.9 %Putnam County: 19 %Queens County: 18.2 %Rensselaer County: 18 %Richmond County: 20.4 %Rockland County: 31.1 %St. Lawrence County: 19.5 %Saratoga County: 18.3 %Schenectady County: 20.8 %Schoharie County: 17 %Schuyler County: 17.8 %Seneca County: 20.3 %Steuben County: 21.1 %Suffolk County: 19.8 %Sullivan County: 21.3 %Tioga County: 19.9 %Tompkins County: 13.3 %Ulster County: 16 %Warren County: 16.5 %Washington County: 18.9 %Wayne County: 20.1 %Westchester County: 20.4 %Wyoming County: 17.7 %Yates County: 22.7 %
  • Under 17
  • 17 to 18
  • 18 to 19
  • 19 to 20
  • 20 to 21
  • 21 and over
%, 2025. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2025

Rockland County: 31.1 %Rockland County31.1Orange County: 25 %Orange County25Bronx County: 23.5 %Bronx County23.5Montgomery County: 23.4 %Montgomery County23.4Jefferson County: 23.2 %Jefferson County23.2Yates County: 22.7 %Yates County22.7Lewis County: 22.4 %Lewis County22.4Sullivan County: 21.3 %Sullivan County21.3Steuben County: 21.1 %Steuben County21.1Schenectady County: 20.8 %Schenectady County20.8Cattaraugus County: 20.8 %Cattaraugus County20.8Oneida County: 20.7 %Oneida County20.7Kings County: 20.7 %Kings County20.7Nassau County: 20.6 %Nassau County20.6Richmond County: 20.4 %Richmond County20.4Westchester County: 20.4 %Westchester County20.4Chenango County: 20.3 %Chenango County20.3Seneca County: 20.3 %Seneca County20.3Wayne County: 20.1 %Wayne County20.1Oswego County: 20.1 %Oswego County20.1Herkimer County: 19.9 %Herkimer County19.9Tioga County: 19.9 %Tioga County19.9Chautauqua County: 19.9 %Chautauqua County19.9Onondaga County: 19.9 %Onondaga County19.9Chemung County: 19.8 %Chemung County19.8Suffolk County: 19.8 %Suffolk County19.8Allegany County: 19.5 %Allegany County19.5St. Lawrence County: 19.5 %St. Lawrence County19.5Erie County: 19.4 %Erie County19.4Monroe County: 19.3 %Monroe County19.3Franklin County: 19.3 %Franklin County19.3Niagara County: 19.1 %Niagara County19.1Putnam County: 19 %Putnam County19Washington County: 18.9 %Washington County18.9Orleans County: 18.7 %Orleans County18.7Fulton County: 18.7 %Fulton County18.7Genesee County: 18.6 %Genesee County18.6Cayuga County: 18.5 %Cayuga County18.5Ontario County: 18.4 %Ontario County18.4Saratoga County: 18.3 %Saratoga County18.3Rockland County: 31.1 %Rockland County31.1Orange County: 25 %Orange County25Bronx County: 23.5 %Bronx County23.5Montgomery County: 23.4 %Montgomery County23.4Jefferson County: 23.2 %Jefferson County23.2Yates County: 22.7 %Yates County22.7Lewis County: 22.4 %Lewis County22.4Sullivan County: 21.3 %Sullivan County21.3Steuben County: 21.1 %Steuben County21.1Schenectady County: 20.8 %Schenectady County20.8Cattaraugus County: 20.8 %Cattaraugus County20.8Oneida County: 20.7 %Oneida County20.7Kings County: 20.7 %Kings County20.7Nassau County: 20.6 %Nassau County20.6Richmond County: 20.4 %Richmond County20.4Westchester County: 20.4 %Westchester County20.4Chenango County: 20.3 %Chenango County20.3Seneca County: 20.3 %Seneca County20.3Wayne County: 20.1 %Wayne County20.1Oswego County: 20.1 %Oswego County20.1Herkimer County: 19.9 %Herkimer County19.9Tioga County: 19.9 %Tioga County19.9Chautauqua County: 19.9 %Chautauqua County19.9Onondaga County: 19.9 %Onondaga County19.9Chemung County: 19.8 %Chemung County19.8Suffolk County: 19.8 %Suffolk County19.8Allegany County: 19.5 %Allegany County19.5St. Lawrence County: 19.5 %St. Lawrence County19.5Erie County: 19.4 %Erie County19.4Monroe County: 19.3 %Monroe County19.3Franklin County: 19.3 %Franklin County19.3Niagara County: 19.1 %Niagara County19.1Putnam County: 19 %Putnam County19Washington County: 18.9 %Washington County18.9Orleans County: 18.7 %Orleans County18.7Fulton County: 18.7 %Fulton County18.7Genesee County: 18.6 %Genesee County18.6Cayuga County: 18.5 %Cayuga County18.5Ontario County: 18.4 %Ontario County18.4Saratoga County: 18.3 %Saratoga County18.3
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2025 (%)Change on 2024
1Rockland County31.1+0.2 pts
2Orange County25-0.1 pts
3Bronx County23.50 pts
4Montgomery County23.4+0.2 pts
5Jefferson County23.2-0 pts
6Yates County22.7-0.3 pts
7Lewis County22.4-0.1 pts
8Sullivan County21.3-0.1 pts
9Steuben County21.1-0.1 pts
10Schenectady County20.8-0.2 pts
11Cattaraugus County20.8-0.4 pts
12Oneida County20.7-0.2 pts
13Kings County20.7-0.3 pts
14Nassau County20.6-0.2 pts
15Richmond County20.4-0.2 pts
16Westchester County20.4-0.3 pts
17Chenango County20.3-0.2 pts
18Seneca County20.3-0.2 pts
19Wayne County20.1-0.3 pts
20Oswego County20.1-0.2 pts
21Herkimer County19.9-0.1 pts
22Tioga County19.9-0.3 pts
23Chautauqua County19.9-0.2 pts
24Onondaga County19.9-0.1 pts
25Chemung County19.8-0.4 pts
26Suffolk County19.8-0.2 pts
27Allegany County19.5-0.2 pts
28St. Lawrence County19.5-0.3 pts
29Erie County19.4-0.1 pts
30Monroe County19.3-0.2 pts
31Franklin County19.3-0.1 pts
32Niagara County19.1-0.2 pts
33Putnam County19-0.2 pts
34Washington County18.9-0 pts
35Orleans County18.7-0.1 pts
36Fulton County18.7-0.5 pts
37Genesee County18.6-0.4 pts
38Cayuga County18.5-0.2 pts
39Ontario County18.4-0.3 pts
40Saratoga County18.3-0.3 pts
41Madison County18.3-0.3 pts
42Queens County18.2-0.2 pts
43Rensselaer County18-0.3 pts
44Broome County17.9-0.1 pts
45Dutchess County17.8-0.2 pts
46Schuyler County17.8-0.3 pts
47Wyoming County17.7-0.3 pts
48Cortland County17.7-0.3 pts
49Clinton County17.6-0.3 pts
50Livingston County17.5-0.2 pts
51Albany County17.5-0.2 pts
52Schoharie County17-0.3 pts
53Warren County16.5-0.3 pts
54Greene County16-0.3 pts
55Ulster County16-0.4 pts
56Otsego County15.9-0.1 pts
57Delaware County15.6-0.3 pts
58Columbia County14.9-0.4 pts
59Essex County14.9-0.6 pts
60Tompkins County13.3-0.2 pts
61New York County12.9-0.2 pts
62Hamilton County11.4+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 York 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 York 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-york-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 York 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-york-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 York 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-york-counties (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_new_york_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 York 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-york-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 York 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-york-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/new-york-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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Rank Counties in New York by population under 18 using official data, and cite the source.
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Questions

Which county has the highest population under 18?

Rockland County, with 31.1% in 2025, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Hamilton County, with 11.4% 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 York: more rankings