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Sharpsburg is a borough in Allegheny County, Pennsylvania, 5 miles (8 km) northeast of downtown Pittsburgh, along the Allegheny River. In the past, it had a rolling mill, foundries, machine shops, and manufacturers of varnish, brick, glass, lumber products, wire, hair, felt, and lubricating oil. In 1900, 6,842 people lived here; by 1940, 8,202 people lived in Sharpsburg. The population was 3,446 at the 2010 census.
The H. J. Heinz Company originated in Sharpsburg.
Sharpsburg is located at 40°29′43″N 79°55′44″W (40.495368, -79.928991).
According to the United States Census Bureau, the borough has a total area of 0.6 square miles (1.6 km2), of which 0.5 square miles (1.3 km2) is land and 0.2 square miles (0.52 km2), or 26.15%, is water.
Sharpsburg has five land borders, including Etna to the west, Shaler Township to the northwest, two of the five non-contiguous areas of O'Hara Township to the north and southeast, and Aspinwall to the east. To the south, across the Allegheny River via 62nd Street Bridge, are the Pittsburgh neighborhoods of Upper Lawrenceville and Morningside.
As of the census of 2000, there were 3,594 people, 1,748 households, and 893 families residing in the borough. The population density was 7,393.8 people per square mile (2,831.9/km²). There were 1,911 housing units at an average density of 3,931.4 per square mile (1,505.8/km²). The racial makeup of the borough was 93.74% White, 3.81% African American, 0.03% Native American, 0.64% Asian, 0.06% Pacific Islander, 0.36% from other races, and 1.36% from two or more races.