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Millvale is a borough in Allegheny County, Pennsylvania, along the Allegheny River, opposite Pittsburgh, and off of Pennsylvania Route 28. The population was 3,744 at the 2010 census.
Millvale is located at 40°28′59″N 79°58′25″W (40.482968, -79.973725).
According to the United States Census Bureau, the borough has a total area of 0.7 square miles (1.8 km2), of which 0.6 square miles (1.6 km2) is land and 0.1 square miles (0.26 km2), or 9.72%, is water.
Millvale is located at the confluence of Girtys Run and the Allegheny River. Much of the borough is on a floodplain and has been subjected to extensive flooding at many times during its history.
Millvale was formed around iron manufacturers, saw works, stone works, lumber mills, breweries, near the mouth of Girtys Run. In 1849, Herrs Island and the adjacent riverfront land of Reserve Township spanning from its northeastern boundary near Girtys Run downriver to Butcher's Run, the then-northeastern border of Allegheny City, were incorporated as the Borough of Duquesne (distinct from the modern borough of the same name). This Duquesne borough was disincorporated in 1868 and partitioned, the downriver portion being annexed to Allegheny City, while that part upriver of the northern end of Herrs Island was joined with adjacent lands to the north and east taken from Shaler Township to form the borough of Millvale.
Until 1952, the borough was served by the "3 Millvale" trolley operated by Pittsburgh Railways.
Millvale has three land borders with Shaler Township from the northwest to east, the Pittsburgh neighborhood of Troy Hill to the southwest, and Reserve Township to the west. Across the Allegheny River, Millvale runs adjacent with Lower Lawrenceville and Central Lawrenceville. Millvale regularly collaborates with its northern riverside neighbors of Etna and Sharpsburg.