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A UK Post Code is made up of a number of different parts like these; BS12 6LS or N1 1DF. All together these are known as Post Code Units. Only really large buildings or large mail users have an individual code unit all to themselves. Usually code units are shared between a number of different premises.
It is worth to note at this point that in a built up area an individual Post Code will represent a handful of houses all within a few 100 metres of each other whereas a Post Code unit in a remote or rural area may represent a group of dwellings many miles apart.
DH1 3AH
DH1 3AQ
DH1 3HN
DH1 3JN
DH1 3LB
DH1 3LR
DH1 3LT
DH1 3QJ
DH1 3RQ
DH1 3RW
DH1 3RX
DH1 3RY
DH1 3RZ
DH1 3SA
DH1 3SP
DH1 3YA
DH1 3YP
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