Allegheny County, Pennsylvania Population
Current Population
1,225,035
Estimated July 1, 2025
-24,550 residents(-2.0%)since 2020
Latest Official Census
1,250,578
2020 Census
Population Over Time
Estimated population changed from 1,249,585 in 2020 to 1,225,035 in 2025.
| Year | Population | Change | % change |
|---|---|---|---|
| 2020 | 1,249,585 | — | — |
| 2021 | 1,245,335 | -4,250 | -0.3% |
| 2022 | 1,233,325 | -12,010 | -1% |
| 2023 | 1,228,911 | -4,414 | -0.4% |
| 2024 | 1,227,174 | -1,737 | -0.1% |
| 2025 | 1,225,035 | -2,139 | -0.2% |
2020 Census (official count): 1,250,578
Sources & Methodology
The current population figure is an annual estimate from the U.S. Census Bureau's Population Estimates Program. The 2020 Census is shown separately as the official benchmark.
Current estimate — 1,225,035 · July 1, 2025
U.S. Census Bureau — County Resident Population Estimates (CO-EST2025-ALLDATA), Vintage 2025
Official Census — 1,250,578 · April 1, 2020
U.S. Census Bureau — 2020 Census Redistricting Data (P.L. 94-171), table P1 — county totals (SUMLEV 050)
These figures can differ because the Census and annual population estimates are produced at different times using different methods. Both are shown so you can distinguish the most current estimate from the official Census benchmark.
How the change since 2020 is calculated
Both endpoints come from the same Census Bureau Population Estimates Program release, so the comparison is like for like: 1,249,585 on July 1, 2020 and 1,225,035 on July 1, 2025. The change is the later estimate minus the earlier one (-24,550), and the percentage is that change divided by the 2020 estimate (-2.0%). The Decennial Census count is never used as an endpoint here — it is an enumeration on a different reference date, produced by a different method, so subtracting one from the other would measure the difference between two methods as well as the change in population.
U.S. Census Bureau — County Resident Population Estimates (CO-EST2025-ALLDATA), Vintage 2025
Incorporated places in Allegheny County
88 incorporated places
- Aspinwall
- Avalon
- Baldwin
- Bell Acres
- Bellevue
- Ben Avon
- Ben Avon Heights
- Bethel Park
- Blawnox
- Brackenridge
- Braddock
- Braddock Hills
- Bradford Woods
- Brentwood
- Bridgeville
- Carnegie
- Castle Shannon
- Chalfant
- Cheswick
- Churchill
- Clairton
- Coraopolis
- Crafton
- Dormont
- Dravosburg
- Duquesne
- East McKeesport
- East Pittsburgh
- Edgewood
- Edgeworth
- Elizabeth
- Emsworth
- Etna
- Forest Hills
- Fox Chapel
- Franklin Park
- Glassport
- Glen Osborne
- Glenfield
- Green Tree
- Haysville
- Heidelberg
- Homestead
- Ingram
- Jefferson Hills
- Leetsdale
- Liberty
- Lincoln
- McDonald
- McKees Rocks
- McKeesport
- Millvale
- Monroeville
- Mount Oliver
- Munhall
- North Braddock
- Oakdale
- Oakmont
- Pennsbury Village
- Pitcairn
- Pittsburgh
- Pleasant Hills
- Plum
- Port Vue
- Rankin
- Rosslyn Farms
- Sewickley
- Sewickley Heights
- Sewickley Hills
- Sharpsburg
- Springdale
- Swissvale
- Tarentum
- Thornburg
- Trafford
- Turtle Creek
- Verona
- Versailles
- Wall
- West Elizabeth
- West Homestead
- West Mifflin
- West View
- Whitaker
- White Oak
- Whitehall
- Wilkinsburg
- Wilmerding
- FIPS code
- 42003
- Classification
- county