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

Sullivan County had the highest median age on 1 July (US county estimates) of 67 counties in 2015, at 51.1 years. Centre County had the lowest, at 30 years. The median was 43.4 years. Source: the U.S. Census Bureau.

Highest51.1Sullivan County

Lowest30Centre County

Median43.467 counties

Top 40 counties, 2015

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	2015 years	Change on 2014
1	Sullivan County	51.1	-0.2
2	Cameron County	50.2	+0.5
3	Wayne County	47.6	+0.3
4	Pike County	47.2	+0.5
5	Susquehanna County	47.1	+0.4
6	Potter County	46.9	+0.3
7	Elk County	46.7	+0.2
7	Warren County	46.7	+0.3
9	Westmoreland County	46.5	+0.2
10	Armstrong County	46	+0.4
10	Venango County	46	+0.3
12	Bedford County	45.9	+0.5
13	Somerset County	45.8	+0.3
14	Carbon County	45.7	+0.3
15	Beaver County	45.1	+0.1
15	Lawrence County	45.1	+0.2
17	Fayette County	45	+0.3
18	Cambria County	44.9	+0.1
19	Schuylkill County	44.7	+0.3
20	Clearfield County	44.6	+0.5
20	Washington County	44.6	+0.2
22	Fulton County	44.5	+0.4
23	Jefferson County	44.2	+0.2
23	Mercer County	44.2	+0.4
23	Northumberland County	44.2	+0.2
26	Bradford County	44.1	0
26	Montour County	44.1	-0.1
28	Forest County	44	+0.1
28	Wyoming County	44	+0.5
30	Bucks County	43.7	+0.2
30	Mifflin County	43.7	+0.2
30	Tioga County	43.7	+0.4
33	Adams County	43.5	+0.3
34	Blair County	43.4	+0.2
34	Luzerne County	43.4	+0.1
36	Huntingdon County	43.3	+0.5
37	Crawford County	43.1	+0.2
37	Perry County	43.1	+0.2
39	Butler County	43	+0.2
39	Juniata County	43	+0.3
41	McKean County	42.7	+0.1
41	Monroe County	42.7	+0.4
43	Greene County	42.6	+0.4
43	Lackawanna County	42.6	+0.1
45	Clarion County	42.4	+0.5
46	Northampton County	42.3	+0.1
47	Franklin County	41.6	+0.2
48	Lebanon County	41.5	0
48	Lycoming County	41.5	+0.2
50	Montgomery County	41.3	+0.1
50	York County	41.3	+0.1
52	Cumberland County	40.8	0
53	Allegheny County	40.6	-0.2
53	Columbia County	40.6	+0.3
55	Berks County	40	+0.1
55	Chester County	40	0
57	Dauphin County	39.9	0
57	Snyder County	39.9	+0.1
59	Indiana County	39.7	+0.4
60	Lehigh County	39.6	-0.1
61	Clinton County	39.5	+0.4
62	Erie County	39.3	+0.1
63	Delaware County	38.9	0
64	Union County	38.8	-0.1
65	Lancaster County	38.6	0
66	Philadelphia County	34	+0.1
67	Centre County	30	+0.3

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), 2015) [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), 2015. 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?period=2015. 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), 2015. 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?period=2015.

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), 2015 [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?period=2015 (Accessed: 12 October 2026).

BibTeX

@misc{census_counties_in_pennsylvania_by_2015,
  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), 2015}},
  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?period=2015. 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), 2015
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?period=2015
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/pennsylvania-counties?period=2015.
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 51.1 years in 2015, according to the U.S. Census Bureau.

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

Centre County, with 30 years in 2015.

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.