Hierarchy
Child units
Warsaw
Urban County
Wołomin County
County
Piaseczno County
County
Radom
Urban County
Pruszków County
County
Mińsk County
County
Radom County
County
Warsaw West County
County
Legionowo County
County
Otwock County
County
Płock
Urban County
Płock County
County
Grodzisk County
County
Garwolin County
County
Grójec County
County
Ostrołęka County
County
Ciechanów County
County
Płońsk County
County
Sochaczew County
County
Siedlce County
County
Nowy Dwór County
County
Żyrardów County
County
Siedlce
Urban County
Wyszków County
County
Mława County
County
Ostrów County
County
Węgrów County
County
Kozienice County
County
Pułtusk County
County
Sokołów County
County
Przasnysz County
County
Ostrołęka
Urban County
Sierpc County
County
Gostynin County
County
Maków County
County
Przysucha County
County
Szydłowiec County
County
Żuromin County
County
Zwoleń County
County
Białobrzegi County
County
Lipsko County
County
Łosice County
County
Also written Województwo mazowieckie.