On August 1, 1927, the uyezds were abolished and Oranienbaumsky District, with the administrative center in the town of Oranienbaum, was established. The governorates were also abolished, and the district was a part of Leningrad Okrug of Leningrad Oblast. On July 23, 1930, the okrugs were abolished as well, and the districts were directly subordinated to the oblast. Between August 1941 and January 1944, during World War II, Lebyazhye was a part of the Oranienbaum Bridgehead, which was protecting the city of Saint Petersburg. On February 23, 1948 the town of Oranienbaum was renamed Lomonosov to commemorate Mikhail Lomonosov, and the district was renamed Lomonosovsky. On November 22, 1966 Lebyazhye was granted urban-type settlement status.