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. Locateddd 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. 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.