Postal codes in Germany
Germany introduced postal codes on 25 July 1941, in the form of a two-digit system that was applied initially for the parcel service and later for all mail deliveries. This system was replaced in 1962 in West Germany by a four-digit system; three years later East Germany followed with its own four-digit system. Whereas the Federal Republic introduced a system with space left for the East German postal system after a possible reunification, such as by omitting all codes starting with '1' (except 1000 for West Berlin) and '9', the German Democratic Republic had a system that used all codes starting from '1' to '9' just for East Germany. Today, German postal codes are numeric and have consisted of five digits since 1993. Between 1990 and 1993 the previous four-digit codes in the former West were prefixed with the letter "W", and in the former East with the letter "O" (for "Ost", "east" in German). Even though the western system had kept some number ranges free, specifically for later integration...
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