 In 1772, Ostashkov was granted town status, and Ostashkovsky Uyezd of Novgorod Governorate was established, with the seat in Ostashkov.In 1775, Tver Viceroyalty was formed from the lands which previously belonged to Moscow and Novgorod Governorates, and the area was transferred to Tver Viceroyalty, which in 1796 was transformed to Tver Governorate.On 1 October 1929, governorates and uyezds were abolished, and Ostashkovsky District with the administrative center in the town of Ostashkov was established.