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 215th largest city in the United States. As of the 2010 census, the city had a total population of 118,032 and is currently the fastest growing city in Pennsylvania. 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, Allentown is 60 miles (97 km) north of Philadelphia, the fifth 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.
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.