Pittsburgh Metro Area Counties

8 counties · 2.4 million people (2025) · 5,640 sq mi

The Pittsburgh metro area (officially the Pittsburgh, PA Metropolitan Statistical Area) has 8 counties in Pennsylvania, with 2,421,992 people in 2025. Allegheny County is the most populous.

Map of the 8 counties of the Pittsburgh metro area with county names and major cities
The 8 counties of the Pittsburgh metro area (yellow) with the largest cities. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).
PDF (Letter) 219 KBPNG (2400 px) 140 KB

The 8 counties of the Pittsburgh metro area

Sorted by population. 5 are central counties (the urban core); the others are outlying counties tied to it by commuting.

CountyCounty seatPopulation 2025Change since 2020Land area (sq mi)Type
Allegheny CountyPittsburgh1,225,035−2%730Central
Westmoreland CountyGreensburg349,324−1.5%1,028Central
Washington CountyWashington210,802+0.7%857Central
Butler CountyButler200,169+3.3%790Central
Beaver CountyBeaver166,032−1.3%435Central
Fayette CountyUniontown123,021−4.5%791Outlying
Lawrence CountyNew Castle83,911−2.5%357Outlying
Armstrong CountyKittanning63,698−2.9%653Outlying

The metro area is part of the larger Pittsburgh-Weirton-Steubenville, PA-OH-WV Combined Statistical Area.

Printable map

The PDF is a vector file for Letter paper; the PNG is 2400 pixels wide. Both are free to use with a credit to WhichCounty.

County maps of Pennsylvania

Other metro areas

All 97 metro area county maps

Sources