European Spatial Planning Observation Network (ESPON) Study on Urban Functions. ESPON project 1.4.3; April 2007, pp. 93–94. "Upper Silesian polycentric metropolitan area. Inside the Katowice morphological area, the main municipalities are Katowice (338), Sosnowiec (240), Gliwice (208), Bytom (200), Zabrze (196), Ruda Slaska (153), Tychy (130), Dabrowa Gornicza (130), and Chorzow (120). Nine other municipalities have less than 100,000 inhabitants."
