Lehigh County (Pennsylvania Dutch: Lechaa Kaundi) is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the county's population was 374,557. Its county seat is Allentown, the state's third-largest city after Philadelphia and Pittsburgh.
Lehigh County and Northampton County to its east combine to form the Lehigh Valley region of eastern Pennsylvania. Lehigh County is one of the fastest-growing counties in Pennsylvania and the more highly populated of the two counties. Both counties are part of the Philadelphia television market, the fourth-largest television market in the nation.
The county is named for the Lehigh River, a 109-mile-long (175 km) tributary of the Delaware River, which flows through Lehigh County. The Lehigh River served a vital role in the county's development by offering a transportation and trading route for its mining products, including iron, manganese, limestone, and ultimately manufactured steel products.
Lehigh County falls geographically between two Pennsylvania Appalachian mountain ridges, Blue Mountain to the county's north and South Mountain to its south. Lehigh County borders Montgomery County to its south, Bucks County to its southeast, Northampton County to its east, Carbon County to its north, Schuylkill County to its northwest, and Berks County to its southwest.
The county is located 61 miles (98 km) northwest of Philadelphia and 99 miles (159 km) west of New York City.

























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