Marshall County is in Western Illinois. Of the 102 counties in the state, 255,070-acre Marshall County ranks 74th by size. A recent survey of Land Network data shows about 1,000 acres of residential land for sale in Illinois's Marshall County, which is valued at a combined $5 million. The average price of residential land for sale in Marshall County was $327,271. Browse all residential land and rural property for sale in Illinois to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.