Ostrovsky District
On August 1, 1927, the uyezds and governorates were abolished and Ostrovsky District, with the administrative center in Ostrov, was established as a part of Pskov Okrug of Leningrad Oblast. It included parts of former Ostrovsky, Opochetsky, and Pskovsky Uyezds. On July 23, 1930, the okrugs were also abolished and the districts were directly subordinated to the oblast. Between March 22, 1935 and September 19, 1940, Ostrovsky District was a part of the restored Pskov Okrug of Leningrad Oblast, one of the okrugs abutting the state boundaries of the Soviet Union. Between July 6, 1941 and July 21, 1944, Ostrov was occupied by German troops. An underground resistance group was active in Ostrov during the war. On August 23, 1944, the district was transferred to newly established Pskov Oblast.