Sussex is one of the three counties in the state of Delaware. It was created in 1664, making it one of the original counties in the state. As of the 2010 census, the population was 197,145, up from 156,638 in 2010. The county seat is Georgetown, and the largest city is either Seaford (whole) or Milford (partial). It has an area of 1,195.65 square miles (3,097 km2), of which 937.58 square miles (2,428 km2) is dry land.
Sussex is bordered by Worcester County, Maryland on the south, Dorchester County, Maryland on the southwest, Wicomico County, Maryland on the west, Caroline County, Maryland on the northwest, Kent County, Delaware to the north, and Delaware Bay to the East. Cape May County, New Jersey is to the east, but with no direct link.