|boundary = postal_code|
|A postal code boundary|
|Used on these elements|
|Status: de facto|
|Tools for this tag|
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Similar pages for structural reference: Tag:railway=tram, Tag:waterway=dock.
On the relation:
On member ways making up the relation†:
† When a way is being shared as an administrative boundary relation (boundary=administrative), and a postal code boundary relation, tag that member way with boundary=administrative. Both boundaries types are implied.
This kind of postal mapping is widely used at least in Germany and Belgium.