Land for sale in Jefferson County, Mississippi, recently totaled around $9 million and almost 9,000 acres. Jefferson County ranks 79th out of 82 counties in the state for the combined amount of land currently advertised for sale. Of all farms and rural land for sale in Jefferson County, Lorman had the most land for sale. Jefferson County is Mississippi's 47th biggest county (527 square miles). It's located in the Capital River Mississippi region of Mississippi.