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is a city located in Lehigh County, Pennsylvania, in the United States. It is Pennsylvania's third most populous city, after Philadelphia and Pittsburgh. As of the 2000 census, the city had a total population of 106,632. It is 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 north of Philadelphia, the sixth most populous city in the United States, east of Harrisburg, the state capital, and west of New York City, the nation's largest city.
Two four-year colleges, Cedar Crest College and Muhlenberg College, are located in Allentown. Dorney Park and Wildwater Kingdom, a very popular amusement park, is located just outside of the city.
Air transport to and from the city is available through Lehigh Valley International Airport .