Postal code (known in various countries as a post code, postcode, or ZIP code) is a series of letters /or digits appended to a postal address for the purpose of sorting mail.
Åland has its own postal administration but still uses the Finnish five-digit postal code system, using the number range 22000-22999, with the prefix AX. The lowest numbered postal code is for the capital Mariehamn, AX 22100, and the highest AX 22950 for Jurmo.
Aland Islands Map :