sentences:  Numbers and sizes of dzielnicas vary significantly between cities.Warsaw has 18 dzielnicas, as does Kraków; Gdańsk has 34, Gdynia 22, Lublin 27, Katowice 22 and Szczecin 4.Some cities are no longer formally divided into dzielnicas, although formerly existing dzielnicas continue to be referred to as such and serve as areas of jurisdiction for administrative offices.