However, southern part of the voivodeship, with Radom, historically belongs to Lesser Poland, while Łomża and its surroundings, even though historically part of Mazovia, now is part of Podlaskie Voivodeship. The province's name recalls the traditional name of the region, Mazovia, with which it is roughly coterminous. The province was created on 1 January 1999, out of the former voivodeships of Warsaw, Płock, Ciechanów, Ostrołęka, Siedlce and Radom, pursuant to the Polish local government reforms adopted in 1998.

Its principal cities are Warsaw (1.783 million) in the centre of the Warsaw metropolitan area, Radom (212,230) in the south, Płock (119,709) in the west, Siedlce (77,990) in the east, and Ostrołęka (52,071) in the north. The voivodeship has an area of 35,579 square kilometres (13,737 sq mi) and, as of 2019, a population of 5,411,446, making it the largest and most populated voivodeship of Poland. The Masovian Voivodeship ( Polish: województwo mazowieckie ), also known as the Mazovia Province, is a voivodeship ( province) in east-central Poland, with its capital located in the city of Warsaw, which also serves as the capital of the country. (of which €100.3 billion Warsaw metropolitan area and €30.2 rest of Masovian Voivodeship)

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