Speaking on the Swiss situation, there is an open access postal area dataset available on a wonky licence, depending on what you want to use it form it may be OK. See https://opendata.swiss/en/dataset/amtliches-ortschaftenverzeichnis-mit-postleitzahl-und-perimeter1
Originally at least it was generated by examining the postal delivery routes, now days it lives a senseless and expensive life of its own. Note that it is updated on a monthly base and tends to have a large number of changes every time. As to address data in OSM: there is no real agreement if we are tagging real postal addresses including postal cities or not, postal cities tend to be difficult to survey and not really accessible for non-locals, so tend to end with a mix of admin entities and postal whatevers in addr:city. Simon _______________________________________________ dev mailing list dev@openstreetmap.org https://lists.openstreetmap.org/listinfo/dev
