Tsukuba District, Ibaraki

• Ina
• Yawara

post-WWII Timeline

• April 1, 1953 - The village of Oho was elevated to town status.
• November 3, 1953 - The village of Kamisato was elevated to town status to become the town of Kamisato.
• June 1, 1954 - The village of Takamichiso was merged into the town of Shimotsuna. The town of Shimotsuna was elevated to city status at the same day.
• July 1, 1954 - The villages of Mishima, Taniita, Toyo and Kohari were merged to create the village of Ina.
• February 1, 1955 - The towns of Tsukuba and Hojo, and the villages of Tamizuyama, Tai, and Oda were merged to create the town of Tsukuba.
• February 21, 1955 - The village of Kuga had split and was merged into the village of Ina and the town of Fujishiro, respectively.
• March 1, 1955 - The villages of Yahara, Towa and Fukuoka were merged with the village of Kokinu to create the village of Yawara.
• March 31, 1955
• * The town of Yatabe, and the villages of Onogawa, Katsuragi, Shimana and parts of Mase were merged to create the town of Yatabe.
• * The remaining parts of the village of Mase was merged into the city of Mitsukaido.
• April 1, 1955
• * The town of Kamisato, and parts of the village of Asahi were merged to create the town of Toyosato.
• * The town of Oho absorbed the remaining parts of the village of Asahi were merged to create the town of Oho.
• June 10, 1955 - The village of Itabashi was merged into the village of Ina.
• September 30, 1956
• * The village of Yoshinuma had split and was merged into the towns of Toyosato and Oho.
• * The village of Sakuoka was merged into the town of Tsukuba.
• July 1, 1957 - The village of Sugama was merged into the town of Tsukuba.
• April 1, 1985 - The village of Ina was elevated to town status.
• November 30, 1987 - The towns of Yatabe, Toyosato and Oho merged with the village of Sakura to form the city of Tsukuba.
• January 31, 1988 - The town of Tsukuba was merged into the city of Tsukuba.
• March 27, 2006 - The town of Ina and the village of Yawara were merged to create the city of Tsukubamirai. Therefore, Tsukuba District was dissolved as a result of this merger.