The Enfield post town in the EN postcode area was in the former postal county. Most of the TW postcode area was in the former postal county. Each postcode area is further divided into post towns and postcode districts. There are no dependent localities used in the postcode area. Ilford's town centre is the head district of the IG postcode area. Edgware is a post town within the HA postcode area. Girobank's headquarters in Bootle used the non-geographic postcode GIR 0AA. Some suburbs share the same postcode. It forms the majority of the London E13 postcode district. A number of parks are within the Sydenham postcode. Other towns have only a generic postcode with the suffix -000. All or part of one or more postcode districts are grouped into post towns. Enquiry officers do not visit addresses in their own postcode, however. The district includes parts of three postcode areas. The Clayton campus has its own suburb and postcode (3800).