|Department of the Duchy of Warsaw|
Łomża Department (Polish: Departament Łomzyński) was an administrative division and local government in the Polish Duchy of Warsaw in the years 1806–1815. Its capital city was Łomża and consisted of 10 counties.
From January to July 1807 the Department was known as the Białystok Department (Departament Białostocki) with the capital of Białystok, but after Treaties of Tilsit, Russia agreed for the creation of the Duchy of Warsaw, but in exchange it was ceded for powiats: Białostocki, Bielski, Sokólski and Drohicki. Thus the capital of the Department had to be moved, and its name changed.
It was divided into 7 counties:
- Biebrzańsk County (seat in Szczuczyn)
- Dąbrowski County (seat in Lipsk, later in Augustów)
- Kalvarija County
- Łomża County
- Marijampolė County
- Tykociń County
- Wigierski-Sejny County (seat in Sejny)
- Dokumenty urzędowe dotyczące Łomży w okresie Księstwa Warszawskiego z 17 XII 1810 roku, 1 VI 1812 roku, 27 VII 1812 roku, Skarby Dziedzictwa Narodowego, Polska.pl
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