Northampton County is a county in the Commonwealth of Pennsylvania, United States. As of the 2020 census, the population was 312,951. Its county seat is Easton. The county was formed in 1752 from parts of Bucks County. Its namesake was the county of Northamptonshire in England, and the county seat of Easton was named for Easton Neston, a country house in Northamptonshire. The county is part of the Southeast Pennsylvania region of the state. Northampton County and Lehigh County to its west combine to form the eastern Pennsylvania region known as the Lehigh Valley; Lehigh County, with a population of 374,557 as of the 2020 U.S. census, is the more highly populated of the two counties. Both counties are part of the Philadelphia media market, the fourth-largest in the nation. Northampton County has historically been a national leader in heavy manufacturing, especially of cement, steel, and other industrial products.

Founded: March 11, 1752
Named for: Northamptonshire
Seat: Easton
Largest city: Bethlehem
Total: 377 sq mi (976.43 km²)
Land: 370 sq mi (958.3 km²)
Water: 7.7 sq mi (19.94 km²), 2.0%
Density: 830/sq mi (/km²)
Time zone: Eastern: UTC-5-4
Official Website: http://www.northamptoncounty.org
Wikidata description: county in Pennsylvania, United States
Wikidata id: Q495658
Wikidata label: Northampton County
Wikidata aliases: Array
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