Counties in Pennsylvania by median age on 1 July (US county estimates), 2025

Sullivan County had the highest median age on 1 July (US county estimates) of 67 counties in 2025, at 55.7 years. Centre County had the lowest, at 34 years. The median was 44.2 years. Source: the U.S. Census Bureau.

Highest55.7Sullivan County

Lowest34Centre County

Median44.267 counties

Top 40 counties, 2025

years. Source: U.S. Census Bureau, Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Retrieved 2026-10-12.

Full ranking

Rank	Counties	2025 years	Change on 2024
1	Sullivan County	55.7	+0.4
2	Cameron County	52.8	+0.7
3	Potter County	50	+0.2
4	Pike County	49.1	+0.1
4	Wayne County	49.1	0
6	Elk County	48.6	+0.1
7	Venango County	47.6	+0.2
8	Armstrong County	47.5	-0.1
9	Bedford County	47.4	+0.1
9	Westmoreland County	47.4	+0.1
11	Warren County	47.3	-0.1
12	Somerset County	47.1	0
12	Susquehanna County	47.1	-0.2
14	Clearfield County	46.5	+0.1
15	Carbon County	46.3	+0.1
16	Fayette County	46.2	+0.1
16	Forest County	46.2	-0.1
18	Cambria County	46	+0.1
19	Fulton County	45.8	+0.2
20	Beaver County	45.2	0
20	Tioga County	45.2	0
22	Lawrence County	45.1	0
23	Jefferson County	45	0
23	Mercer County	45	+0.1
23	Wyoming County	45	+0.1
26	Washington County	44.9	0
27	Adams County	44.8	+0.2
27	Bucks County	44.8	+0.2
27	Greene County	44.8	+0.2
30	Crawford County	44.6	+0.1
30	Huntingdon County	44.6	+0.2
32	Blair County	44.4	+0.1
32	Monroe County	44.4	+0.2
34	McKean County	44.2	+0.2
35	Northumberland County	44.1	0
35	Schuylkill County	44.1	-0.1
37	Butler County	43.9	+0.2
37	Perry County	43.9	0
39	Montour County	43.7	+0.1
40	Bradford County	43.6	-0.1
41	Juniata County	43	+0.1
41	Mifflin County	43	-0.3
43	Clarion County	42.7	-0.2
44	Luzerne County	42.4	-0.1
45	Lackawanna County	42.3	0
45	Northampton County	42.3	+0.1
47	Lycoming County	42.1	+0.2
47	Montgomery County	42.1	+0.2
49	Franklin County	42	0
49	Lebanon County	42	0
51	York County	41.5	+0.1
52	Erie County	41.3	+0.2
53	Chester County	41.2	+0.2
54	Snyder County	41	+0.2
55	Allegheny County	40.8	+0.1
56	Clinton County	40.7	-0.1
56	Indiana County	40.7	+0.1
58	Columbia County	40.6	0
59	Cumberland County	40.5	+0.1
60	Berks County	40.3	+0.1
60	Lehigh County	40.3	+0.2
62	Dauphin County	40	+0.3
63	Delaware County	39.9	+0.3
63	Lancaster County	39.9	+0.3
65	Union County	39.5	+0.1
66	Philadelphia County	35.7	+0.3
67	Centre County	34	+0.4

Other periods

About this ranking

Age that divides the resident population of a US county into two halves of equal size on 1 July, from Census Bureau population estimates calculated by single year of age.

Counties only: the county file has no state or national medians, and medians cannot be added up. A single-year estimate, unlike median_age, which for US places is a five-year American Community Survey estimate.

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: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. 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: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage (Counties in Pennsylvania by median age on 1 July (US county estimates), 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: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage, Counties in Pennsylvania by median age on 1 July (US county estimates), 2025. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/pennsylvania-counties. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Counties in Pennsylvania by median age on 1 July (US county estimates), 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/median-age-july-1-us-counties/pennsylvania-counties.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage, Counties in Pennsylvania by median age on 1 July (US county estimates), 2025 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/median-age-july-1-us-counties/pennsylvania-counties (Accessed: 12 October 2026).

BibTeX

@misc{census_counties_in_pennsylvania_by_2025,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: median age (MEDIAN\_AGE\_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage: Counties in Pennsylvania by median age on 1 July (US county estimates), 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/median-age-july-1-us-counties/pennsylvania-counties. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN\_AGE\_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. 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: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage: Counties in Pennsylvania by median age on 1 July (US county estimates), 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/median-age-july-1-us-counties/pennsylvania-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/pennsylvania-counties.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. 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 median age on 1 July (US county estimates)?

Sullivan County, with 55.7 years in 2025, according to the U.S. Census Bureau.

Which county has the lowest median age on 1 July (US county estimates)?

Centre County, with 34 years 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: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Retrieved 2026-10-12.