Lehigh County 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. Along with Northampton County to its east, the two counties combine to form the Lehigh Valley region of eastern Pennsylvania, the third-largest metropolitan area of Pennsylvania with a population of 861,889 as of 2020. 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 tributary of the Delaware River, which flows through Lehigh County.

Founded: March 6, 1812
Named for: Lehigh River
Seat: Allentown
Largest city: Allentown
Total: 348 sq mi (901.32 km²)
Land: 345 sq mi (893.55 km²)
Water: 3.1 sq mi (8.03 km²), 0.9%
Density: 1,046/sq mi (/km²)
Time zone: Eastern: UTC-5-4
Official Website: http://www.lehighcounty.org
Wikidata description: county in Pennsylvania, United States of America
Wikidata id: Q494117
Wikidata label: Lehigh County
Wikidata aliases: Array
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