Central Illinois is home to three cities: Decatur, Peoria, and Pana. Decatur is a city of about 76, 000 people located in Macon County, and is the largest city in Central Illinois. Peoria is a city of about 115, 000 people located in Peoria County, and is the second largest city in Central Illinois. Pana is a city of about 5, 000 people located in Christian County, and is the smallest city in Central Illinois.