Великолукская область
On 1 October 1929, governorates and uyezds were abolished, and Penovsky District with the administrative center in the settlement of Peno was established. It belonged to Velikiye Luki Okrug of Western Oblast. On August 1, 1930 the okrugs were abolished, and the districts were subordinated directly to the oblast. On January 29, 1935 Kalinin Oblast was established, and Penovsky District was transferred to Kalinin Oblast. During World War II, a part of the district including Peno was occupied by German troops. On 22 August 1944, the district was transferred to newly established Velikiye Luki Oblast. On 2 October 1957, Velikiye Luki Oblast was abolished, and Penovsky District was transferred back to Kalinin Oblast. In February 1963, during the abortive administrative reform by Nikita Khrushchev, Kirovsky and Penovsky Districts were merged into Ostashkovsky District. On December 27, 1973 Penovsky District was re-established. In 1990, Kalinin Oblast was renamed Tver Oblast.