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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.
SG12 4AY
SG12 4BE
SG12 4BU
SG12 4DD
SG12 4DL
SG12 4DN
SG12 4DS
SG12 4DX
SG12 4DY
SG12 4DZ
SG12 4EF
SG12 4EJ
SG12 4EL
SG12 4EP
SG12 4EQ
SG12 4ER
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