About 125,000 people.

Allentown is the third biggest city in Pennsylvania and the heart of the Lehigh Valley. It grew up along the Lehigh River and is known for its parks, factories, and a proud story from the American Revolution.
You can visit the Liberty Bell Museum where the real bell was once hidden, splash around at the Dorney Park water rides, and explore the trails along the river. The America On Wheels museum shows cool old cars and trucks.
Dorney Park and its Wildwater Kingdom offer roller coasters and water slides for a whole day of fun.
The city has miles of green parks along the Lehigh River, great for biking, picnics, and playgrounds.