The value of land for sale in Wabash County, Illinois, recently on Land.com was nearly $5 million. This represents nearly 1,000 acres of land for sale in Wabash County. Wabash County ranks 79th out of 102 counties in the state for the combined amount of land currently advertised for sale. Of all locations in Wabash County with farms and rural land for sale, Mount Carmel featured the most land for sale. Mining and mineral extraction-related services are the main economic drivers in this part of Illinois. Wabash County is the 98th biggest county (227 square miles) in Illinois. It's located in the Southern Illinois region of Illinois.