Warsaw Department
Warsaw Department was a unit of administrative division and local government in Polish Duchy of Warsaw in years 1806–1815.
Capital city: Warsaw- Błonie County
- Brzezin County
- Czersk County
- Gostynin County
- Łęczyca County
- Orłów County
- Rawa Mazowiecka County
- Sochaczew County
- Warszawa County
- Zgiersk County
- Siennick County
- Stanisławow County
In 1815 it was transformed into Masovian Voivodeship.
