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 2021, at 54.2 years. Centre County had the lowest, at 31.8 years. The median was 44 years. Source: the U.S. Census Bureau.

Highest54.2Sullivan County

Lowest31.8Centre County

Median4467 counties

Top 40 counties, 2021

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	2021 years	Change on 2020
1	Sullivan County	54.2	-0.4
2	Cameron County	51.8	+0.4
3	Potter County	49.1	+0.4
3	Wayne County	49.1	-0.1
5	Pike County	48.6	-0.4
6	Elk County	48.2	+0.1
7	Susquehanna County	48.1	-0.1
8	Bedford County	47.6	0
8	Venango County	47.6	0
10	Warren County	47.5	-0.1
10	Westmoreland County	47.5	-0.2
12	Armstrong County	47.4	+0.1
13	Somerset County	47.1	+0.1
14	Clearfield County	46.3	+0.3
15	Carbon County	46.2	-0.5
15	Forest County	46.2	-0.1
17	Fayette County	46.1	-0.1
18	Cambria County	46	-0.1
19	Beaver County	45.4	-0.2
20	Fulton County	45.3	-0.2
21	Lawrence County	45.2	-0.2
22	Schuylkill County	45.1	-0.4
23	Wyoming County	45	-0.3
24	Jefferson County	44.9	+0.1
24	Mercer County	44.9	-0.2
26	Washington County	44.8	-0.2
27	Tioga County	44.6	-0.3
28	Bucks County	44.3	0
29	Northumberland County	44.2	-0.2
30	Adams County	44.1	-0.6
30	Crawford County	44.1	0
32	Blair County	44	-0.2
32	Greene County	44	+0.4
32	Huntingdon County	44	-0.1
35	Bradford County	43.8	-0.2
35	McKean County	43.8	-0.1
37	Perry County	43.7	0
38	Monroe County	43.4	+0.2
39	Mifflin County	43.3	-0.4
40	Butler County	43.2	-0.4
40	Montour County	43.2	-0.4
42	Juniata County	43.1	0
43	Luzerne County	42.9	-0.3
44	Clarion County	42.5	-0.8
45	Lackawanna County	42.3	-0.2
46	Franklin County	42.1	-0.1
47	Northampton County	41.9	-0.6
48	Lebanon County	41.8	0
49	Lycoming County	41.7	-0.1
50	Montgomery County	41.4	0
50	York County	41.4	0
52	Columbia County	41.2	-0.3
52	Indiana County	41.2	-0.1
54	Clinton County	40.7	-0.8
54	Erie County	40.7	+0.2
56	Chester County	40.5	0
57	Snyder County	40.4	+0.1
58	Berks County	40.3	0
58	Cumberland County	40.3	-0.5
60	Allegheny County	40.2	0
61	Lehigh County	39.9	0
62	Dauphin County	39.6	-0.1
63	Union County	39.4	-0.2
64	Delaware County	39.2	-0.1
64	Lancaster County	39.2	0
66	Philadelphia County	34.7	+0.1
67	Centre County	31.8	+0.2

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), 2021) [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), 2021. 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=2021. 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), 2021. 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=2021.

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), 2021 [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=2021 (Accessed: 12 October 2026).

BibTeX

@misc{census_counties_in_pennsylvania_by_2021,
  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), 2021}},
  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=2021. 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), 2021
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=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/pennsylvania-counties?period=2021.
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 54.2 years in 2021, according to the U.S. Census Bureau.

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

Centre County, with 31.8 years in 2021.

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.