Area code 309 serves central and western Illinois, including cities like Peoria, Bloomington, and Galesburg. Introduced in 1957, it was split from area code 217. The city of Peoria is a key highlight,situated on the Illinois River, it blends riverfront views with cultural staples like the Peoria Riverfront Museum and the Caterpillar Visitors Center. With a strong industrial history and growing arts scene, Peoria offers a well-rounded urban experience in a relaxed Midwestern setting.