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

Counties in New York by population under 18

Rockland County had the highest population under 18 of 62 counties in 2024, at 30.9%. Hamilton County had the lowest, at 11.3%. The median was 19.4% and the figure for New York was 19.7%. Source: the U.S. Census Bureau.

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Highest30.9Rockland County
Lowest11.3Hamilton County
Median19.462 counties
New York19.7History

Map of counties, 2024

Albany County: 17.7 %Allegany County: 19.7 %Bronx County: 23.5 %Broome County: 18 %Cattaraugus County: 21.1 %Cayuga County: 18.8 %Chautauqua County: 20.1 %Chemung County: 20.1 %Chenango County: 20.5 %Clinton County: 17.9 %Columbia County: 15.3 %Cortland County: 18 %Delaware County: 15.9 %Dutchess County: 18 %Erie County: 19.5 %Essex County: 15.5 %Franklin County: 19.4 %Fulton County: 19.1 %Genesee County: 19 %Greene County: 16.3 %Hamilton County: 11.3 %Herkimer County: 20 %Jefferson County: 23.2 %Kings County: 20.9 %Lewis County: 22.5 %Livingston County: 17.8 %Madison County: 18.6 %Monroe County: 19.5 %Montgomery County: 23.2 %Nassau County: 20.8 %New York County: 13.1 %Niagara County: 19.3 %Oneida County: 20.9 %Onondaga County: 20 %Ontario County: 18.7 %Orange County: 25.1 %Orleans County: 18.9 %Oswego County: 20.3 %Otsego County: 16 %Putnam County: 19.2 %Queens County: 18.4 %Rensselaer County: 18.3 %Richmond County: 20.6 %Rockland County: 30.9 %St. Lawrence County: 19.7 %Saratoga County: 18.6 %Schenectady County: 20.9 %Schoharie County: 17.2 %Schuyler County: 18.1 %Seneca County: 20.5 %Steuben County: 21.2 %Suffolk County: 20 %Sullivan County: 21.4 %Tioga County: 20.2 %Tompkins County: 13.5 %Ulster County: 16.3 %Warren County: 16.8 %Washington County: 18.9 %Wayne County: 20.4 %Westchester County: 20.7 %Wyoming County: 18 %Yates County: 23 %
  • Under 17
  • 17 to 18
  • 18 to 19
  • 19 to 20
  • 20 to 21
  • 21 and over
%, 2024. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2024

Rockland County: 30.9 %Rockland County30.9Orange County: 25.1 %Orange County25.1Bronx County: 23.5 %Bronx County23.5Montgomery County: 23.2 %Montgomery County23.2Jefferson County: 23.2 %Jefferson County23.2Yates County: 23 %Yates County23Lewis County: 22.5 %Lewis County22.5Sullivan County: 21.4 %Sullivan County21.4Steuben County: 21.2 %Steuben County21.2Cattaraugus County: 21.1 %Cattaraugus County21.1Schenectady County: 20.9 %Schenectady County20.9Kings County: 20.9 %Kings County20.9Oneida County: 20.9 %Oneida County20.9Nassau County: 20.8 %Nassau County20.8Westchester County: 20.7 %Westchester County20.7Richmond County: 20.6 %Richmond County20.6Seneca County: 20.5 %Seneca County20.5Chenango County: 20.5 %Chenango County20.5Wayne County: 20.4 %Wayne County20.4Oswego County: 20.3 %Oswego County20.3Tioga County: 20.2 %Tioga County20.2Chemung County: 20.1 %Chemung County20.1Chautauqua County: 20.1 %Chautauqua County20.1Onondaga County: 20 %Onondaga County20Herkimer County: 20 %Herkimer County20Suffolk County: 20 %Suffolk County20St. Lawrence County: 19.7 %St. Lawrence County19.7Allegany County: 19.7 %Allegany County19.7Monroe County: 19.5 %Monroe County19.5Erie County: 19.5 %Erie County19.5Franklin County: 19.4 %Franklin County19.4Niagara County: 19.3 %Niagara County19.3Putnam County: 19.2 %Putnam County19.2Fulton County: 19.1 %Fulton County19.1Genesee County: 19 %Genesee County19Washington County: 18.9 %Washington County18.9Orleans County: 18.9 %Orleans County18.9Cayuga County: 18.8 %Cayuga County18.8Ontario County: 18.7 %Ontario County18.7Madison County: 18.6 %Madison County18.6Rockland County: 30.9 %Rockland County30.9Orange County: 25.1 %Orange County25.1Bronx County: 23.5 %Bronx County23.5Montgomery County: 23.2 %Montgomery County23.2Jefferson County: 23.2 %Jefferson County23.2Yates County: 23 %Yates County23Lewis County: 22.5 %Lewis County22.5Sullivan County: 21.4 %Sullivan County21.4Steuben County: 21.2 %Steuben County21.2Cattaraugus County: 21.1 %Cattaraugus County21.1Schenectady County: 20.9 %Schenectady County20.9Kings County: 20.9 %Kings County20.9Oneida County: 20.9 %Oneida County20.9Nassau County: 20.8 %Nassau County20.8Westchester County: 20.7 %Westchester County20.7Richmond County: 20.6 %Richmond County20.6Seneca County: 20.5 %Seneca County20.5Chenango County: 20.5 %Chenango County20.5Wayne County: 20.4 %Wayne County20.4Oswego County: 20.3 %Oswego County20.3Tioga County: 20.2 %Tioga County20.2Chemung County: 20.1 %Chemung County20.1Chautauqua County: 20.1 %Chautauqua County20.1Onondaga County: 20 %Onondaga County20Herkimer County: 20 %Herkimer County20Suffolk County: 20 %Suffolk County20St. Lawrence County: 19.7 %St. Lawrence County19.7Allegany County: 19.7 %Allegany County19.7Monroe County: 19.5 %Monroe County19.5Erie County: 19.5 %Erie County19.5Franklin County: 19.4 %Franklin County19.4Niagara County: 19.3 %Niagara County19.3Putnam County: 19.2 %Putnam County19.2Fulton County: 19.1 %Fulton County19.1Genesee County: 19 %Genesee County19Washington County: 18.9 %Washington County18.9Orleans County: 18.9 %Orleans County18.9Cayuga County: 18.8 %Cayuga County18.8Ontario County: 18.7 %Ontario County18.7Madison County: 18.6 %Madison County18.6
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2024 (%)Change on 2023
1Rockland County30.9+0.5 pts
2Orange County25.1-0 pts
3Bronx County23.50 pts
4Montgomery County23.2-0 pts
5Jefferson County23.2-0.2 pts
6Yates County23-0.1 pts
7Lewis County22.5-0.3 pts
8Sullivan County21.4-0.1 pts
9Steuben County21.2-0.1 pts
10Cattaraugus County21.1-0.2 pts
11Schenectady County20.9-0.1 pts
12Kings County20.9-0.2 pts
13Oneida County20.9-0.1 pts
14Nassau County20.8-0.2 pts
15Westchester County20.7-0.2 pts
16Richmond County20.6-0.2 pts
17Seneca County20.5-0.1 pts
18Chenango County20.5-0.2 pts
19Wayne County20.4-0.2 pts
20Oswego County20.3-0.1 pts
21Tioga County20.2-0.3 pts
22Chemung County20.1-0.3 pts
23Chautauqua County20.1-0.1 pts
24Onondaga County20-0.2 pts
25Herkimer County20-0.2 pts
26Suffolk County20-0.1 pts
27St. Lawrence County19.7-0.2 pts
28Allegany County19.7-0.3 pts
29Monroe County19.5-0.2 pts
30Erie County19.5-0.1 pts
31Franklin County19.4-0.7 pts
32Niagara County19.3-0.1 pts
33Putnam County19.2-0.1 pts
34Fulton County19.1-0.3 pts
35Genesee County19-0.5 pts
36Washington County18.90 pts
37Orleans County18.9-0.3 pts
38Cayuga County18.8-0.3 pts
39Ontario County18.7-0.3 pts
40Madison County18.6-0.3 pts
41Saratoga County18.6-0.3 pts
42Queens County18.4-0.1 pts
43Rensselaer County18.3-0.1 pts
44Schuyler County18.1-0.5 pts
45Dutchess County18-0.2 pts
46Broome County18-0.2 pts
47Wyoming County18-0.2 pts
48Cortland County18-0.2 pts
49Clinton County17.9-0.3 pts
50Livingston County17.8-0.3 pts
51Albany County17.7-0.2 pts
52Schoharie County17.2-0.3 pts
53Warren County16.8-0.3 pts
54Ulster County16.3-0.4 pts
55Greene County16.3-0.3 pts
56Otsego County16-0.1 pts
57Delaware County15.9-0.4 pts
58Essex County15.5-0.6 pts
59Columbia County15.3-0.4 pts
60Tompkins County13.5-0.2 pts
61New York County13.1-0.2 pts
62Hamilton County11.30 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, 2024) [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, 2024. 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?period=2024. 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, 2024. 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?period=2024.

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, 2024 [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?period=2024 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_new_york_2024,
  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, 2024}},
  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?period=2024. 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, 2024
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?period=2024
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/new-york-counties?period=2024.
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 30.9% in 2024, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Hamilton County, with 11.3% in 2024.

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