This level of spatial aggregation covers the area of the Metropolitan Association of Upper Silesia which consists of the following cities: Bytom,  Chorzów, Dąbrowa Górnicza, Gliwice, Jaworzno, Katowice, Mysłowice, Piekary Śląskie, Ruda Śląska, Siemianowice Śląskie, Sosnowiec, Świętochłowice, Tychy, Zabrze.