was a

district A district is a type of administrative division that in some countries is managed by the local government. Across the world, areas known as "districts" vary greatly in size, spanning regions or county, counties, several municipality, municip ...

located in

Ibaraki Prefecture is a Prefectures of Japan, prefecture of Japan located in the Kantō region of Honshu. Ibaraki Prefecture has a population of 2,828,086 (1 July 2023) and has a geographic area of . Ibaraki Prefecture borders Fukushima Prefecture to the north, ...

Japan Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asia, Asian mainland, it is bordered on the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea ...

. At its greatest extent it included the areas of today's cities of

Jōsō is a city located in Ibaraki Prefecture, Japan. , the city had an estimated population of 59,314 in 21,168 households and a population density of 480 persons per km2. The percentage of the population aged over 65 was 38.8%. The total area of t ...

, Shimotsuma,

Toride 260px, Ohori-no-watashi is a city located in Ibaraki Prefecture, Japan. , the city had an estimated population of 103,717 in 47,545 households and a population density of 1482 persons per km2. The percentage of the population aged over 65 was 34 ...

, Tsuchiura,

Tsukuba is a city located in Ibaraki Prefecture, Japan. As of January 1, 2024, the city had an estimated population of 256,526 in 121,001 households and a population density of 900 persons per km2. The percentage of the population aged over 65 wa ...

, and Tsukuba Mirai. The district had two towns before the dissolution: Ina and Yawara. On 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.

Post-WWII timeline

* April 1, 1953 – The village of Oho was elevated to town status. (4 towns, 22 villages) * November 3, 1953 – The village of Kamisato was elevated to town status to become the town of Kamisato. (5 towns, 21 villages) * June 1, 1954 – The village of Takamichiso was merged into the town of Shimotsuma (from Makabe District). The town of Shimotsuma was elevated to city status at the same day. (5 towns, 20 villages) * July 1, 1954 – The villages of Mishima, Taniita, Toyo and Kohari were merged to create the village of Ina. (5 towns, 17 villages) * 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. (4 towns, 14 villages) * February 21, 1955 – The village of Kuga had split and was merged into the village of Ina and the town of Fujishiro (in Kitasōma District), respectively. (4 towns, 13 villages) * March 1, 1955 – The villages of Yahara, Towa and Fukuoka were merged with the village of Kokinu (from Kitasouma District) to create the village of Yawara. (4 towns, 11 villages) * March 31, 1955 (4 towns, 7 villages) ** 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 (4 towns, 6 villages) ** 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. (4 towns, 5 villages) * September 30, 1956 (4 towns, 3 villages) ** The village of Yoshinuma had split and was merged into the towns of Toyosato and Oho (respectively). ** 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. (4 towns, 2 villages) * April 1, 1985 – The village of Ina was elevated to town status. (5 towns, 1 village) * November 30, 1987 – The towns of Yatabe, Toyosato and Oho merged with the village of Sakura (from Niihari District) to form the city of

. (2 towns, 1 village) * January 31, 1988 – The town of Tsukuba was merged into the city of Tsukuba. (1 town, 1 village) * 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.

References

{{coord missing, Ibaraki Prefecture Former districts of Ibaraki Prefecture