Białystok Voivodeship (Polish: Województwo białostockie) was a unit of administrative division and local government in Poland from 1975 to 1998, when it was superseded by the Podlaskie Voivodeship. Its capital city was Białystok. It was formed in 1975 from part of the existing Białystok Voivodeship. The region was 10,055 km2 (3,882 sq mi), and its population in 1994, about 700 000 inhabitants. It was divided into 20 cities and 50 municipalities. It bordered with four Voivodeships: Suwałki, Łomża, Siedlce and Biała Podlaska and until 1991 with the Soviet Union (Belorussian SSR), and later with Belarus.