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Allegheny County (/ ˌ æ l ɪ ˈ ɡ eɪ n i / AL-ig-AY-nee) is a county in Pennsylvania, United States. It is located in Southwestern Pennsylvania . As of the 2020 census, the population was 1,250,578, making it the state's second-most populous county , after Philadelphia County .

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Allegheny County: 003: Pittsburgh: 1788: Parts of Washington and Westmoreland Counties: Delaware word for the Allegheny River, which possibly translates to "beautiful river" 1,233,253: 745 sq mi (1,930 km 2) Armstrong County: 005: Kittanning: 1800: Parts of Allegheny, Lycoming, and Westmoreland Counties: John Armstrong, Revolutionary War ...

Allegheny City was a municipality that existed in the U.S. state of Pennsylvania from 1788 until it was annexed by Pittsburgh in 1907. It was located north across the Allegheny River from downtown Pittsburgh , with its southwest border formed by the Ohio River , and is known today as the North Side .

Allegheny County ( / ælɪˈɡeɪni /) is a county in the southwest of the U.S. state of Pennsylvania. As of 2020 the population was 1,250,578. [1] The county seat is Pittsburgh. [2] Allegheny was Pennsylvania's first to bear a Native American name, being named after the Allegheny River .

Allegheny County, Pennsylvania. QuickFacts provides statistics for all states and counties, and for cities and towns with a population of 5,000 or more.

In 2020, Allegheny County, PA had a population of 1.22M people with a median age of 40.8 and a median household income of $62,320. Between 2019 and 2020 the population of Allegheny County, PA declined from 1.22M to 1.22M, a −0.275% decrease and its median household income grew from $61,043 to $62,320, a 2.09% increase.

Allegheny County, Pennsylvania. Pennsylvania. United States. Population Estimates, July 1, 2022, (V2022) . 1,233,253. . 12,972,008. .