High Quality Content by WIKIPEDIA articles! The PO postcode area, also known as the Portsmouth postcode area, is a group of postal districts around Bembridge, Bognor Regis, Chichester, Cowes, East Cowes, Emsworth, Fareham, Freshwater, Gosport, Havant, Hayling Island, Lee-on-the-Solent, Newport, Portsmouth, Rowland's Castle, Ryde, Sandown, Seaview, Shanklin, Southsea, Totland Bay, Ventnor, Waterlooville and Yarmouth in England. The adjacent postcode areas are (clockwise from east) - BN (Brighton) - BH (Bournemouth) - SO (Southampton) - GU (Guildford) - RH (Redhill).