where is decatur, il
Decatur Real Estate Listings and Information Decatur, Illinois If you're looking for a great place to buy a new home, Decatur, Illinois is a great place to look! Decatur is the largest city and the county seat of Macon County in the U.S. state of Illinois. The city was founded in 1829 and is located along the Sangamon River and Lake Decatur in Central Illinois.