If you’re publishing a “trusted links” directory (or building a city guide), the safest approach is to use official city portals and confirm the City Hall / Municipal Office address from the city’s own contact/BIP pages (Public Information Bulletin).
Verified city portals + City Hall / Municipal Office addresses
| City | Official city portal | City Hall / Municipal Office (official page) | City Hall address |
|---|---|---|---|
| Warsaw | https://en.um.warszawa.pl/ | https://en.um.warszawa.pl/contact | Bankowy Square 3/5, 00-950 Warsaw, Poland |
| Kraków | https://www.krakow.pl/ | https://www.bip.krakow.pl/ | pl. Wszystkich Świętych 3-4, 31-004 Kraków, Poland |
| Wrocław | https://www.wroclaw.pl/urzad/ | https://bip.um.wroc.pl/ | Sukiennice 9, 50-107 Wrocław, Poland |
| Gdańsk | https://www.gdansk.pl/ | https://www.gdansk.pl/urzad-miejski | ul. Nowe Ogrody 8/12, 80-803 Gdańsk, Poland |
| Poznań | https://www.poznan.pl/en/ | https://www.poznan.pl/ | Plac Kolegiacki 17, 61-841 Poznań, Poland |
| Łódź | https://lodz.pl/ | https://uml.lodz.pl/kontakt/ | ul. Piotrkowska 104, 90-926 Łódź, Poland |
| Szczecin | https://szczecin.eu/en | https://szczecin.eu/pl | Plac Armii Krajowej 1, 70-456 Szczecin, Poland |
| Lublin | https://lublin.eu/en/ | https://lublin.eu/en/ | plac Króla Władysława Łokietka 1, 20-109 Lublin, Poland |
| Katowice | https://katowice.eu/en | https://katowice.eu/en/en/city-authorities/city-hall | ul. Młyńska 4, 40-098 Katowice, Poland |
| Białystok | https://www.bialystok.pl/ | https://www.bialystok.pl/pl/dane-kontaktowe.html | ul. Słonimska 1, 15-950 Białystok, Poland |
| Rzeszów | https://erzeszow.pl/ | https://bip.erzeszow.pl/ | Rynek 1, 35-064 Rzeszów, Poland |
| Bydgoszcz | https://www.bydgoszcz.pl/ | https://um.bydgoszcz.pl/ | ul. Jezuicka 1, 85-102 Bydgoszcz, Poland |
| Toruń | https://torun.pl/pl | https://bip.torun.pl/ | ul. Wały gen. Sikorskiego 8, 87-100 Toruń, Poland |
| Olsztyn | https://olsztyn.eu/ | https://olsztyn.eu/en/municipality/contact.html | Plac Jana Pawła II 1, 10-101 Olsztyn, Poland |
| Kielce | https://www.kielce.eu/ | https://www.kielce.eu/pl/kontakt.html | Rynek 1, 25-303 Kielce, Poland |
| Opole | https://www.opole.pl/en | https://www.bip.um.opole.pl/ | Rynek 1A, 45-015 Opole, Poland |
| Zielona Góra | https://www.zielona-gora.pl/en/home/ | https://www.zielona-gora.pl/kontakt/ | ul. Podgórna 22, 65-213 Zielona Góra, Poland |
| Gorzów Wielkopolski | https://www.gorzow.pl/ | https://um.gorzow.pl/kontakt.html | ul. Sikorskiego 4, 66-400 Gorzów Wielkopolski, Poland |
| Gdynia | https://www.gdynia.pl/ | https://bip.um.gdynia.pl/ | al. Marszałka Piłsudskiego 52/54, 81-382 Gdynia, Poland |
| Sopot | https://www.sopot.pl/ | https://bip.sopot.pl/ | ul. Tadeusza Kościuszki 25/27, 81-704 Sopot, Poland |
Tip for “any city in Poland”
For smaller towns, the fastest “official verification” path is to find the city’s BIP page (Public Information Bulletin), because it’s the legally required publication channel for public institutions.