Allentown is a city located in Lehigh County, Pennsylvania, in the United States. It is Pennsylvania's third most populous city, after Philadelphia and Pittsburgh, and the 239th largest city in the United States. As of the 2000 census, the city had a total population of 106,632, (2008 estimate 111,025). It is also the county seat of Lehigh County.
Located on the Lehigh River, Allentown is the largest of three adjacent cities that make up a region of eastern Pennsylvania and western New Jersey known as the Lehigh Valley, with the cities of Bethlehem and Easton nearby. Allentown is 60 miles (97 km) north of Philadelphia, the sixth most populous city in the United States, 80 miles (130 km) east of Harrisburg, the state capital, and 90 miles (140 km) west of New York City, the nation's largest city.