Великолукская область
On August 1, 1927, Idritsky District with the administrative center in the settlement of Idritsa was also established. It included parts of former Sebezhsky Uyezd. The district was a part of Velikiye Luki Okrug of Leningrad Oblast. On June 17, 1929, the district was transferred to Western Oblast. On July 23, 1930, the okrugs were also abolished and the districts were directly subordinated to the oblast. On January 1, 1932, Idritsky District was abolished and split between Sebezhsky and Pustoshkinsky Districts. On June 1, 1936, it was re-established as a part of Velikiye Luki Okrug of Kalinin Oblast; on May 4, 1938, the district was transferred to Opochka Okrug. On August 22, 1944, the district was transferred to Velikiye Luki Oblast. On October 2, 1957, Velikiye Luki Oblast was abolished and Idritsky District was transferred to Pskov Oblast. On October 3, 1959, Idritsky District was abolished and merged into Sebezhsky District.