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Source: Postal codes in Poland

In Poland, postal codes were introduced in 1973. They are five-digit codes of two-then-three digits, with a hyphen between them.
The first digit indicates one of the 10 large postal regions the country is divided into. These areas do not follow the administrative divisions. The second and third digits specify a particular smaller region (originally the number of a regional sorting office, there was one in every county), and the last two are the number of a postal delivery branch.
Clients receiving particularly large volumes of mail may have their own unique postal codes; the same goes for PO Box lobbies of the largest post offices.
Postal codes are written in Poland before the city/town/locality name, e.g. 00-001 Warszawa.
First digit in the postal code represents the postal district, second digit major geographical subdivision of this district, and the three digits after dash: the post office, or in case of large cities: particular street, part of the street or even separate address (in the last case code is in the form of xy-9zz). Thus the postal code 70-952 means:

7 – postal district of Szczecin,
0 – subdivision of that district, in this case the Western Part of Szczecin,
9 – denotes special code, and
52 – Office of the District Attorney (Prokuratura Okręgowa).
Similarly, the code for 70-470 denotes the odd numbers from 1 to 27 in the Wojska Polskiego Street in Szczecin, and 34-434 is a code for whole town of Dębno near Nowy Targ (3 – postal district of Kraków, 4 – subdivision of that district, 434 the town of Dębno – strictly speaking the post office in Dębno).
Postal districts and their subdivisions are not related to the administrative division of Poland.