The SO postcode area, also known as the Southampton postcode area, is a group of 23 postcode districts in England, which are subdivisions of nine post towns. These postcode districts cover south and central Hampshire, including the post towns of Southampton, Winchester, Alresford, Brockenhurst, Eastleigh, Lymington, Lyndhurst, Romsey and Stockbridge; and other towns, such as Totton, Hythe, Hedge End and Bishop's Waltham.