Kashima District, Ibaraki
- On September 1, 1995 - the town of Kashima absorbed the village of Ōno to create the city of Kashima.
- On August 1, 2005 - the town of Kamisu absorbed the town of Hasaki to create the city of Kamisu.
- On October 11, 2005 - the town of Hokota absorbed the villages of Asahi and Taiyō to create the city of Hokota. Therefore, Kashima District was dissolved as a result of this merger.