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About Lehigh Valley

The Lehigh Valley () is a geographic and metropolitan region formed by the Lehigh River in Lehigh and Northampton counties in eastern Pennsylvania. It is a component valley of the Great Appalachian Valley bounded to its north by Blue Mountain, to its south by South Mountain, to its west by Lebanon Valley, and to its east by the Delaware River and Warren County, New Jersey. The Lehigh Valley is about 40 miles (64 km) long and 20 miles (32 km) wide. The Lehigh Valley's largest city is Allentown, the third-largest city in Pennsylvania and the county seat of Lehigh County, with a population of 125,845 residents as of the 2020 census. The Allentown–Bethlehem–Easton metropolitan area, which includes the Lehigh Valley, is currently Pennsylvania's third-most populous metropolitan area after those of Philadelphia and Pittsburgh, and the nation's 67th-largest metropolitan area with a population of 873,555 as of 2023.