Kitasōma District, Ibaraki

• Tone

  Timeline

• December 2, 1878 - The district was founded when Sōma District in Shimōsa Province split into Kitasouma District in Ibaraki Prefecture and Minamisōma District in Chiba Prefecture.
• March 13, 1947 - The village of Ino merged into the town of Toride.
• March 20, 1954 - The villages of Kawaharashiro and Kitabunkan were merged into the town of Ryūgasaki in Inashiki District. The town gained city status at the same time.
• March 21, 1954 - The parts of the village of Takasu merged into the city of Ryūgasaki.
• July 10, 1954 - The village of Sakate merged into the town of Mitsukaido in Yūki District. The town gained city status at the same time.
• January 1, 1955 - The town of Fukawa and the villages of Bunkan, Mon, and Higashibunkan merged to form the town of Tone.
• February 21, 1955
• *The town of Souma and the villages of Rokugo, Sano, and parts of Takasu merged to form the town of Fujishiro.
• *The remaining parts of Takasu was merged into the city of Ryūgasaki.
• March 1, 1955
• *The town of Moriya and the villages of Takano, Ohno, and Oizawa merged to form the town of Moriya.
• *The village of Kokinu merged with the villages of Tanihara, Towa, and Fukuoka from Tsukuba District to form the town of Yawara.
• April 1, 1956 - The villages of Uchimoriya and Kano were merged into the city of Mitsukaidō.
• October 1, 1970 - The town of Toride gained city status.
• February 2, 2002 - The town of Moriya gained city status.
• March 28, 2005 - The town of Fujishiro merged into the expanded city of Toride.