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Baldwin is a borough in Allegheny County, Pennsylvania, United States (not to be confused with adjacent Baldwin Township), and is part of the Pittsburgh Metro Area. The population was 19,767 at the 2010 census.
Baldwin is located at 40°21′26″N 79°58′10″W. A thin strip of land which is still part of Baldwin stretches north along Becks Run Road, separating St. Clair and Hays, reaching all the way to the Monongahela River. It then forms the south bank of the river almost to the Glenwood Bridge, effectively surrounding Hays on three sides.
According to the United States Census Bureau, the borough has a total area of 5.9 square miles (15 km2), of which, 5.8 square miles (15 km2) of it is land and 0.1 square miles (0.26 km2) of it is water. Its average elevation is 1,214 feet (370 m) above sea level.
Baldwin has eleven borders, including five with the Pittsburgh neighborhoods of Arlington and South Side Flats to the north, Hays to the northeast, Carrick to the west, and St. Clair to the north-northwest. The remaining borders are with West Mifflin to the east, Pleasant Hills to the southeast, South Park Township to the south, Bethel Park to the southwest, and Whitehall and Brentwood to the west.
The borough was named for Henry Baldwin (1780–1844), a U.S. Congressman from Pennsylvania and Associate Justice of the Supreme Court.