Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The province was created on January 1, 1999, out of the former Warsaw, Plock, Ciechanow, Ostroleka, Siedlce and Radom Voivodeships, pursuant to the Polish local government reforms adopted in 1998. The province's name recalls the traditional name of the region, Mazowsze sometimes rendered in English as "Masovia", with which it is roughly coterminous. However, it must be noted that southern part of the voivodeship, with Radom, historically belongs to Malopolska, while Lomza and its surroundings, even though historically part of Masovia, now is part of Podlasie Voivodeship.

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