Postcodes were introduced in Poland on January 1, 1973 (Ordinance of the Minister of Postal Services No. 89 of November 17, 1972 on the introduction of postcodes, Dziennik Ustaw No. 8, item 48 with amendment).
The Polish postcodes consist of five digits, the first digit determining the postal region (okręg pocztowy). Polish postcodes are written in the format dd-ddd before the place name (e.g. 01-224 Warszawa).
The major cities of Białystok , Bielsko-Biała , Bydgoszcz , Gdansk , Gdynia , Katowice , Kielce , Koszalin , Krakow , Lublin , Łódź , Olsztyn , Opole , Poznań , Radom , Rzeszów , Sopot , Szczecin , Warsaw , Wrocław and Zielona have several postcodes smaller towns each have a postcode, in the countryside each post office has its own postcode (which may then be the same for several villages).
There are also mail recipients who have their own zip code. B. 00-999 for Polish TV .
The first digit of the postcode is the postal region:
0 - Warsaw , Mazovia
1 - Białystok, Warmia , Masuria
2 - Lublin, Podlachia , Kielce, Radom, Świętokrzyskie
3 - Krakow, Lesser Poland , Rzeszów, Subcarpathian
4 - Katowice, Upper Silesia , Opole, Opole Silesia
5 - Wroclaw , Lower Silesia
6 - Poznan , Greater Poland , Zielona Góra (Grünberg), Gorzów Wielkopolski (Landsberg), Lebuser Land
7 - Stettin , West Pomerania
8 - Gdansk , Pomerania , Bydgoszcz (Bromberg), Toruń (Thorn), Kujawy
9 - Łódź (Lodz)