Of 92 counties in the Hoosier?State, Sullivan County is 19th in terms of its size (454 square miles). Sullivan County is in West Indiana. Sullivan County, Indiana, has 1,000 acres of ranches for sale based on recent Land Network data. The combined market value of land and rural real estate for sale here was approximately $500,000. Browse all Sullivan County ranches for sale on the Land Network to find the ranch that's right for your business or commercial needs, from the sprawling legacy ranch to unbelievable residential ranch for your second home, investment property or retirement nest egg. The most common type of land for sale by combined acreage in Sullivan County is house.