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Bethlehem is a city in Northampton and Lehigh Counties in the Lehigh Valley region of eastern Pennsylvania. As of the 2020 census, Bethlehem had a total population of 75,781. Of this, 55,639 were in Northampton County and 19,343 were in Lehigh County. It is Pennsylvania's seventh most populous city. The city is located along the Lehigh River, a 109-mile-long (175 km) tributary of the Delaware River. Bethlehem borders Allentown to its west and is 48 miles (77 km) north of Philadelphia and 72 miles (116 km) west of New York City.