The SS postcode area, also known as the Southend-on-Sea postcode area, is a group of seventeen postcode districts in England, which are subdivisions of eleven post towns. These postcode districts cover south-east Essex, including Southend-on-Sea, Basildon, Benfleet, Canvey Island, Hockley, Leigh-on-Sea, Rayleigh, Rochford, Stanford-le-Hope, Westcliff-on-Sea and Wickford.