According to the U.S. Census Bureau, Allegheny County has a total area of 745 square miles - 730 square miles is land, and 1...5 square miles (1.95%) is water. Allegheny County is known for the three major rivers that flow through it - the Allegheny and Monongahela converge at Downtown Pittsburgh to form the Ohio. The Youghiogheny River flows into the Monongahela at McKeesport, 10 miles...
Administration, County Courthouse, Information Center
Parks Department, Administrative Information