The combined value of farmsand rural real estate for sale in Wabash County recently on Land.com was almost $4 million. This represents almost 1,000 acres of farms, rural land, hunting land and other land for sale in Wabash County. Wabash County ranks 83rd out of 102 counties in Illinois for the total acreage of land currently advertised for sale. Mount Carmel had 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.