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(pronounced by some as "Mill-ville") is a borough in Allegheny County, Pennsylvania, on 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.
According to the United States Census Bureau, the borough has a total area of 0.7 square miles (1.9 km²), of which, 0.6 square miles (1.7 km²) of it is land and 0.1 square miles (0.2 km²) of it (9.72%) is water.
Millvale is located at the confluence of Girtys Run and the Allegheny River. Much of the borough is on a flood plain and has been subjected to extensive flooding at many times during its history.