The Civic Record
County · Pennsylvania

Allegheny County

Allegheny County

Allegheny County is a large urban county in Pennsylvania, United States. As of the 2025 census estimate, the population was 1,225,035, a 2% decrease of 25,543 residents since 2020, making it the state's second-most populous county, after Philadelphia County. Its county seat and most populous city is Pittsburgh, Pennsylvania's second most populous city. The county is part of the Greater Pittsburgh region of the commonwealth, and is the center of the Pittsburgh media market.

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1,238,090 population (2021) · County area: Allegheny · Official website

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Cities and towns 86

Townships 42

Reference data (Census of Governments 2022)
Census ID (PID6)
193970
FIPS state
42
FIPS county
003
FIPS place
99003
Census record name
COUNTY OF ALLEGHENY
Mailing address
RM 101 ALLEGHENY COUNTY COURTHOUSE, PITTSBURGH 15219