The Sejmik of Masovia consists of 51 members.

The current voivode of Masovia is Konstanty Radziwiłł. The voivode is then assisted in performing his duties by the voivodeship's marshal, who is the appointed speaker for the voivodeship's executive and is elected by the sejmik ( provincial assembly). The Masovian voivodeship's government is headed by the province's voivode ( governor) who is appointed by the Polish Prime Minister. These are listed below in descending order of population (according to official figures for 2019): Ĭities (governed by a city mayor or prezydent miasta): The voivodeship contains 10 cities and 78 towns. Warka, Nowe Miasto nad Pilicą, Mogielnica Konstancin-Jeziorna, Góra Kalwaria, Tarczyn

Sulejówek, Halinów, Kałuszyn, # Mrozy (3,574) Ząbki, Marki, Kobyłka, Zielonka, Radzymin, Tłuszcz The counties, shown on the numbered map, are described in the table below. Pruszków is part of the Warsaw metropolitan area. Additionally, the Kampinos National Park located within Masovia is a UNESCO-designated biosphere reserve. Moreover, it is popular among holidaymakers due to the number of historical monuments and greenery forests cover over 20% of the voivodeship's area, where pines and oaks predominate in the regional landscape. It currently has the lowest unemployment rate in Poland and is classified as a very high income province. Mazovian Voivodeship is the centre of science, research, education, industry and infrastructure in the country. It is bordered by six other voivodeships: Warmian-Masurian to the north, Podlaskie to the north-east, Lublin to the south-east, Świętokrzyskie to the south, Łódź to the south-west, and Kuyavian-Pomeranian to the north-west. 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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