 On October 2, 1957, Velikiye Luki Oblast was abolished, and Nelidovsky District was transferred back to Kalinin Oblast.On February 1, 1963, during the abortive Khrushchyov administrative reform, Oleninsky and Belsky Districts were merged into Nelidovsky District, and a part of Nelidovsky District was transferred to Zapadnodvinsky District.In 1964-65 Oleninsky and Belsky Districts were re-established.