The value of all land and rural real estate for sale in Illinois's Sangamon County recently was nearly $100 million, representing a total of 1,670 acres of land for sale in Sangamon County. Sangamon County ranks 17th in the state for the combined amount of land currently advertised for sale. Of all farms and rural land for sale in Sangamon County, Springfield featured the most land for sale. From an economic perspective, government and state-level services contribute most to Sangamon County's overall GDP. Sangamon County is one of the ten largest counties in Illinois (877 square miles). It's located in the Central Illinois region of the state.