Administratively, Leningrad Oblast is divided into seventeen districts and a town of oblast significance, Sosnovy Bor. Lomonosovsky District is the only one in Russia which has its administrative center (the town of Lomonosov) located in the area of a different subject of Russian Federation (the federal city of Saint Petersburg, which is not a part of Leningrad Oblast).
In terms of the area, the biggest administrative district is Podporozhsky District (7,706 square kilometres (2,975 sq mi)); the smallest one is Lomonosovsky District (1,919 square kilometres (741 sq mi)).
