About 110,000 people.

Peoria is one of the oldest cities in Illinois, sitting on the Illinois River. It is famous for the big Caterpillar company that builds giant yellow tractors and machines.
You can explore the fun Peoria Riverfront Museum with its planetarium, see animals at the Peoria Zoo, or ride a boat along the wide Illinois River.
Peoria's riverfront has a science museum, a planetarium to look at stars, and boats that glide along the water on warm days.
Peoria is the home of Caterpillar, a company that makes huge yellow bulldozers and tractors that kids love to watch move mountains of dirt.