Data / Rankings / Population under 18 / Counties in Pennsylvania

Counties in Pennsylvania by population under 18

Lancaster County had the highest population under 18 of 67 counties in 2016, at 23.7%. Forest County had the lowest, at 9.1%. The median was 20.1% and the figure for Pennsylvania was 20.8%. Source: the U.S. Census Bureau.

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Highest23.7Lancaster County
Lowest9.1Forest County
Median20.167 counties
Pennsylvania20.8History

Map of counties, 2016

Adams County: 20.7 %Allegheny County: 18.8 %Armstrong County: 19.3 %Beaver County: 19.4 %Bedford County: 20.2 %Berks County: 22.7 %Blair County: 20.4 %Bradford County: 22 %Bucks County: 21 %Butler County: 20.6 %Cambria County: 19.2 %Cameron County: 17.1 %Carbon County: 19.7 %Centre County: 15.5 %Chester County: 23.4 %Clarion County: 19.5 %Clearfield County: 18.6 %Clinton County: 20.9 %Columbia County: 18.2 %Crawford County: 21.2 %Cumberland County: 20.4 %Dauphin County: 22 %Delaware County: 22.2 %Elk County: 19.4 %Erie County: 21.6 %Fayette County: 19.1 %Forest County: 9.1 %Franklin County: 23 %Fulton County: 20.6 %Greene County: 19.1 %Huntingdon County: 18.8 %Indiana County: 18.7 %Jefferson County: 20.9 %Juniata County: 22.6 %Lackawanna County: 19.8 %Lancaster County: 23.7 %Lawrence County: 19.9 %Lebanon County: 22.8 %Lehigh County: 22.5 %Luzerne County: 19.3 %Lycoming County: 20.6 %McKean County: 20.1 %Mercer County: 20 %Mifflin County: 22.1 %Monroe County: 20.5 %Montgomery County: 21.8 %Montour County: 20.4 %Northampton County: 20.1 %Northumberland County: 20.1 %Perry County: 22 %Philadelphia County: 21.3 %Pike County: 19.4 %Potter County: 21 %Schuylkill County: 19.3 %Snyder County: 21.7 %Somerset County: 18.2 %Sullivan County: 16.3 %Susquehanna County: 19.5 %Tioga County: 20.2 %Union County: 18.4 %Venango County: 20.6 %Warren County: 19.5 %Washington County: 19.5 %Wayne County: 17.3 %Westmoreland County: 18.7 %Wyoming County: 19.9 %York County: 22.3 %
  • Under 19
  • 19 to 20
  • 20 to 21
  • 21 to 22
  • 22 and over
%, 2016. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2016

Lancaster County: 23.7 %Lancaster County23.7Chester County: 23.4 %Chester County23.4Franklin County: 23 %Franklin County23Lebanon County: 22.8 %Lebanon County22.8Berks County: 22.7 %Berks County22.7Juniata County: 22.6 %Juniata County22.6Lehigh County: 22.5 %Lehigh County22.5York County: 22.3 %York County22.3Delaware County: 22.2 %Delaware County22.2Mifflin County: 22.1 %Mifflin County22.1Bradford County: 22 %Bradford County22Dauphin County: 22 %Dauphin County22Perry County: 22 %Perry County22Montgomery County: 21.8 %Montgomery County21.8Snyder County: 21.7 %Snyder County21.7Erie County: 21.6 %Erie County21.6Philadelphia County: 21.3 %Philadelphia County21.3Crawford County: 21.2 %Crawford County21.2Potter County: 21 %Potter County21Bucks County: 21 %Bucks County21Clinton County: 20.9 %Clinton County20.9Jefferson County: 20.9 %Jefferson County20.9Adams County: 20.7 %Adams County20.7Fulton County: 20.6 %Fulton County20.6Butler County: 20.6 %Butler County20.6Venango County: 20.6 %Venango County20.6Lycoming County: 20.6 %Lycoming County20.6Monroe County: 20.5 %Monroe County20.5Montour County: 20.4 %Montour County20.4Blair County: 20.4 %Blair County20.4Cumberland County: 20.4 %Cumberland County20.4Tioga County: 20.2 %Tioga County20.2Bedford County: 20.2 %Bedford County20.2Northampton County: 20.1 %Northampton County20.1Northumberland County: 20.1 %Northumberland County20.1McKean County: 20.1 %McKean County20.1Mercer County: 20 %Mercer County20Lawrence County: 19.9 %Lawrence County19.9Wyoming County: 19.9 %Wyoming County19.9Lackawanna County: 19.8 %Lackawanna County19.8Lancaster County: 23.7 %Lancaster County23.7Chester County: 23.4 %Chester County23.4Franklin County: 23 %Franklin County23Lebanon County: 22.8 %Lebanon County22.8Berks County: 22.7 %Berks County22.7Juniata County: 22.6 %Juniata County22.6Lehigh County: 22.5 %Lehigh County22.5York County: 22.3 %York County22.3Delaware County: 22.2 %Delaware County22.2Mifflin County: 22.1 %Mifflin County22.1Bradford County: 22 %Bradford County22Dauphin County: 22 %Dauphin County22Perry County: 22 %Perry County22Montgomery County: 21.8 %Montgomery County21.8Snyder County: 21.7 %Snyder County21.7Erie County: 21.6 %Erie County21.6Philadelphia County: 21.3 %Philadelphia County21.3Crawford County: 21.2 %Crawford County21.2Potter County: 21 %Potter County21Bucks County: 21 %Bucks County21Clinton County: 20.9 %Clinton County20.9Jefferson County: 20.9 %Jefferson County20.9Adams County: 20.7 %Adams County20.7Fulton County: 20.6 %Fulton County20.6Butler County: 20.6 %Butler County20.6Venango County: 20.6 %Venango County20.6Lycoming County: 20.6 %Lycoming County20.6Monroe County: 20.5 %Monroe County20.5Montour County: 20.4 %Montour County20.4Blair County: 20.4 %Blair County20.4Cumberland County: 20.4 %Cumberland County20.4Tioga County: 20.2 %Tioga County20.2Bedford County: 20.2 %Bedford County20.2Northampton County: 20.1 %Northampton County20.1Northumberland County: 20.1 %Northumberland County20.1McKean County: 20.1 %McKean County20.1Mercer County: 20 %Mercer County20Lawrence County: 19.9 %Lawrence County19.9Wyoming County: 19.9 %Wyoming County19.9Lackawanna County: 19.8 %Lackawanna County19.8
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2016 (%)Change on 2015
1Lancaster County23.7-0.2 pts
2Chester County23.4-0.2 pts
3Franklin County23-0.1 pts
4Lebanon County22.8-0.2 pts
5Berks County22.7-0.1 pts
6Juniata County22.60 pts
7Lehigh County22.5-0.1 pts
8York County22.3-0.1 pts
9Delaware County22.2-0.1 pts
10Mifflin County22.1-0.3 pts
11Bradford County22-0.1 pts
12Dauphin County22-0.1 pts
13Perry County22-0.1 pts
14Montgomery County21.8-0.1 pts
15Snyder County21.7-0 pts
16Erie County21.6-0.1 pts
17Philadelphia County21.3-0.2 pts
18Crawford County21.2-0.1 pts
19Potter County21-0.2 pts
20Bucks County21-0.2 pts
21Clinton County20.9+0.1 pts
22Jefferson County20.9-0.2 pts
23Adams County20.7-0.1 pts
24Fulton County20.6-0.3 pts
25Butler County20.6-0.2 pts
26Venango County20.6-0 pts
27Lycoming County20.6-0 pts
28Monroe County20.5-0.3 pts
29Montour County20.4-0.1 pts
30Blair County20.4-0 pts
31Cumberland County20.40 pts
32Tioga County20.2-0 pts
33Bedford County20.2-0.3 pts
34Northampton County20.1-0.2 pts
35Northumberland County20.1+0.1 pts
36McKean County20.1-0.2 pts
37Mercer County20-0.2 pts
38Lawrence County19.9-0 pts
39Wyoming County19.9-0.4 pts
40Lackawanna County19.8-0 pts
41Carbon County19.7-0.2 pts
42Susquehanna County19.5-0.1 pts
43Washington County19.5-0.2 pts
44Clarion County19.5+0.1 pts
45Warren County19.5-0.1 pts
46Beaver County19.4-0.1 pts
47Pike County19.4-0.2 pts
48Elk County19.4-0.3 pts
49Schuylkill County19.3-0.1 pts
50Armstrong County19.3-0.1 pts
51Luzerne County19.3-0.1 pts
52Cambria County19.2-0.1 pts
53Fayette County19.1-0.1 pts
54Greene County19.10 pts
55Huntingdon County18.8-0 pts
56Allegheny County18.8-0.1 pts
57Westmoreland County18.7-0.2 pts
58Indiana County18.7+0.2 pts
59Clearfield County18.6-0.1 pts
60Union County18.4+0.1 pts
61Somerset County18.2-0.1 pts
62Columbia County18.2+0.1 pts
63Wayne County17.3-0.2 pts
64Cameron County17.1-0.7 pts
65Sullivan County16.3+0.3 pts
66Centre County15.5+0.1 pts
67Forest County9.1-0.4 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 Pennsylvania by population under 18, 2016) [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 Pennsylvania by population under 18, 2016. 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/pennsylvania-counties?period=2016. 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 Pennsylvania by population under 18, 2016. 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/pennsylvania-counties?period=2016.

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 Pennsylvania by population under 18, 2016 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-under-18/pennsylvania-counties?period=2016 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_pennsylvania_by_2016,
  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 Pennsylvania by population under 18, 2016}},
  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/pennsylvania-counties?period=2016. 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 Pennsylvania by population under 18, 2016
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/pennsylvania-counties?period=2016
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/pennsylvania-counties?period=2016.
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 Pennsylvania by population under 18 using official data, and cite the source.
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Questions

Which county has the highest population under 18?

Lancaster County, with 23.7% in 2016, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Forest County, with 9.1% in 2016.

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 Pennsylvania: more rankings