The outward code is the first half of a postcode (before the space). Some are non-geographic, i.e. … See more

The inward code is the second half of a postcode (after the space). The inward code assists in the delivery of post within a postal district. Its distinguishing features are: 1. Exa… See more

The postcode area is the longest initial string of letters in a postcode. Examples include: 1. L(Liverpool) 2. EH(Edinburgh) 3. BT(Northern Ireland) Check our list of postcode a… See more

The district code is part of the outward code. It is between two and four characters long. It does not include the trailing letter found in some outcodes. Examples of district cod… See more

The sub-district code is part of the outward code. It is often not present, only existing in particularly high density London districts. It is between three and four characters long. It does incl… See more

The postcode unit is the last two letters of a postcode. Each postcode unit generally represents: 1. a street 2. part of a street 3. a single address 4. a group of properties 5. a single prop… See more