Portslade is the name of an area of the city of Brighton and Hove, England. Portslade Village, the original settlement a mile inland to the north, was built up in the 16th century. The arrival of the railway from Brighton in 1840 encouraged rapid development of the coastal area and in 1896 the southern part, known as Copperas Gap, was granted urban district status and renamed Portslade-by-Sea, making it distinct from Portslade Village. After World War II the district of Mile Oak was added.