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The following is a list of the 67 counties of the U.S. state of Pennsylvania. The city of Philadelphia is coterminous with Philadelphia County, the municipalities having been consolidated in 1854, and all remaining county government functions having been merged into the city after a 1951 referendum. [ 1][ 2] Eight of the ten most populous ...
Pennsylvania. ( 2020) Allegheny County ( / ˌælɪˈɡeɪni / AL-ig-AY-nee) is a county in Pennsylvania, United States. As of the 2020 census, the population was 1,250,578, 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 ...
Dauphin County ( / ˈdɔːfɪn /; Pennsylvania Dutch: Daffin Kaundi) is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 286,401. [ 2] The county seat is Harrisburg, [ 3] Pennsylvania's state capital and ninth-most populous city. The county was created on March 4, 1785, from part of Lancaster County and ...
Philadelphia County is the most populous of the 67 counties of Pennsylvania and the 24th-most populous county in the nation. As of the 2020 census , the county had a population of 1,603,797. [ 1 ] Its county seat is Philadelphia , the nation's sixth-largest city .
Northampton County and Lehigh County to its west combine to form the eastern Pennsylvania region known as the Lehigh Valley; Lehigh County, with a population of 374,557 as of the 2020 U.S. census, is the more highly populated of the two counties. Both counties are part of the Philadelphia media market, the fourth-largest in the nation.
Designated. May 10, 1982 [ 1] Centre County is a county in the Commonwealth of Pennsylvania, United States. As of the 2020 census, the population was 158,172. [ 2] Its county seat is Bellefonte. [ 3] Centre County comprises the State College, PA Metropolitan Statistical Area. The county is part of the Central Pennsylvania region of the state.
Washington County is a county in the Commonwealth of Pennsylvania, United States. As of the 2020 census, the population was 209,349. [ 1] Its county seat is Washington. [ 2] The county is part of the Greater Pittsburgh region of the state. [ a] The county is home to Washington County Airport, three miles (4.8 km) southwest of Washington.
Montgomery County, colloquially referred to as Montco, [ 1 ] is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population of the county was 856,553, making it the third-most populous county in Pennsylvania after Philadelphia and Allegheny counties. [ 2 ] The county is part of the Southeast Pennsylvania region of the state.