Ostrovsky District
On August 1, 1927, the uyezds were abolished, and Ostrovsky District was established, with the administrative center in the town of Ostrov. It included parts of former Ostrovsky and Pskovsky Uyezds. The governorates were abolished as well, and the district became a part of Pskov Okrug of Leningrad Oblast. 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 Pskov Okrug of Leningrad Oblast, one of the okrugs abutting the state boundaries of the Soviet Union. Between August 1941 and July 1944, Ostrovsky District 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.