Only a single officially incorporated multi-purpose
metropolitan union exists in Poland, the
sui generis Metropolis GZM, established by a dedicated act of Parliament of Poland within the
Silesian Voivodeship, currently composed of 41 contiguous municipalities, with some of them containing also rural areas. Its total population is 2,279,560. The metropolis largely coincides with the metropolitan area of the
Katowice urban area, which is a part of the wider polycentric transnational
Katowice-Ostrava metropolitan area. A
de facto metropolitan area is, however, also formed in some aspects by
Warsaw metropolitan area, consisting of the capital city of
Warsaw, a
city with powiat rights, and the 9 neighbouring counties:
Warsaw West County,
Nowy Dwór County,
Legionowo County,
Wołomin County,
Mińsk County,
Otwock County,
Piaseczno County,
Pruszków County and
Grodzisk County. Warsaw forms together with these counties a
NUTS 2 area separate as an exception from the remainder of its home region, the
Mazovian Voivodeship. In addition, identical area is policed by the Capital City Police Headquarters separate from the Mazovian Voivodeship Police Headquarters, with a status equal to that of voivodeship police headquarters. Attempts to establish a formally incorporated metropolitan union have been fiercely resisted by the citizens and the city mayor of Warsaw who have considered them a form of concealed
gerrymandering, potentially leading to a political takeover of the city government through aiming to counterbalance the profoundly liberal city population with the conservative population of the neighbouring areas. A third widely known metropolitan area is the
metropolitan area of Tricity in
Pomeranian Voivodeship, urban area of which consists of the eponymous cities of
Gdańsk,
Sopot and
Gdynia. The designation has been used informally or semi-formally only. A strategic cooperation declaration, the Tricity Charter (Polish:
Karta Trójmiasta), was signed by the three city mayors on 28 March 2007. The only incorporated common management authority in the Tricity metro is the Gdańsk Bay Public Transport Metropolitan Union () which is, despite the name, an inter-municipal union and not a metropolitan one. == Largest cities and towns by population ==