Manchester has numerous postcodes, which means that the address or postcode district would need to be known to determine the specific postcode. Manchester is part of the M postcode area and has two enclaved areas, Salford and Sale, included in the area as well.
The Royal Mail regularly and frequently changes the post codes. When mailing something to the Manchester area in England, it is advisable to contact the person that it is being mailed to so that the postcode can be verified prior to sending. Postcodes in the United Kingdom do not coincide with any borders and are used only for mail purposes, unlike other countries where they can assist in emergency services in finding a person's location.