The value of all farms and rural land for sale in Illinois's Macon County recently was almost $20 million, representing a total of 902 acres of land for sale in Macon County. Macon County ranks 28th in Illinois for the combined amount of land currently advertised for sale. Of all farms and rural land for sale in Macon County, Decatur featured the most land for sale. From an economic perspective, manufacturing and related services are the main sectors in Macon County. Macon County is Illinois's 40th largest county (585 square miles). It's located in the Central Illinois region of the state.