Millvale (pronounced by some as "Mill-ville") is a borough in Allegheny County, Pennsylvania, along the Allegheny River, opposite Pittsburgh. In the past, it had iron manufactures, saw works, stone works, lumber mills, breweries, etc. In 1900, the number of people residing here totaled 6,736; in 1910, 7,861;, and in 1940, 7,811. The population was 4,028 at the 2000 census.
Until 1952 the borough was served by the 3 Millvale trolley operated by Pittsburgh Railways.