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...the population lives in cities. The largest urban centres (all with populations exceeding 150,000) are Katowice, Częstochowa, Sosnowiec, Gliwice, Bytom, Zabrze, and Bielsko-Biała. The Upper Silesian Industrial District, centred on Katowice, is the largest conurbation in Poland, with a population of more than 3,000,000 at the beginning of the 21st century.
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