Allegheny County is a county located in the U.S. state of Pennsylvania. As of the most recent data available, the county has a population of approximately 1,281,666 people, with a population density of about 755.71 persons per square mile.
The county spans a total land area of 730.00 square miles (1,891.00 square kilometers). The administrative center and county seat is Pittsburgh, which often serves as a hub for local governance and services. The largest city within the county by population is Pittsburgh.
Geographically, Allegheny County experiences varied elevations, with its highest point at Whitehall 1,257 ft and its lowest point at Baldwin 0 ft. The region operates in the UTC-5.