The east and south of the current area of the oblast was transferred in 1727 to Moscow and Novgorod Governorates.
After a sequence of administrative reforms, the northeastern part of the oblast ended up in 1801 in Olonets Governorate.
Additionally, the areas adjacent to the Narva River, including the town of Ivangorod, were assigned to Estonia in 1920, following the Estonian War of Independence and the Treaty of Tartu, signed on February 2, 1920.
[13] Subsequently, the administrative divisions were merged and split on a regular basis, so that some districts were abolished, and others were established.
The areas of Estonia adjacent to the Narva River, including the town of Ivangorod, were transferred to Leningrad Oblast on November 24, 1944.
[16] On the same day some areas, which are now parts of Vyborgsky and Priozersky Districts, were transferred from the Karelo-Finnish Soviet Socialist Republic to Leningrad Oblast.
After 1944, some areas which belonged to Leningrad Oblast, were on several occasions transferred to the federal city of Saint Petersburg.
This list includes the districts which existed in the current area of Leningrad Oblast.