There was a total of around $753 million of farms, rural land, hunting land and other land for sale in Santa Rosa County recently on Land.com. The total of all Santa Rosa County farms and rural land for sale was 7,000 acres. Santa Rosa County ranks sixth out of 67 counties in the Sunshine State for the combined amount of land currently advertised for sale. Milton had the most land for sale. Santa Rosa County is Florida's 17th largest county (1,173 square miles). It's located in the Northwest Florida region of Florida.