Krasnoselsky District
In December 1931, Leningrad was administratively separated from Leningrad Oblast. At that time it included the Leningrad Suburban District, some parts of which were transferred back to Leningrad Oblast in 1936 and turned into Vsevolozhsky District, Krasnoselsky District, Pargolovsky District and Slutsky District (renamed Pavlovsky District in 1944).