Tone District, Gunma
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As of May, 2008, the district has an estimated Population of 39,026 and a Density of 29.5 persons/km². The total area is 1,322.38 km².
The district contains one town and three villages.
- April 1, 1889 - Due to the municipal status enforcement, the town of Numata and the villages of Tonami, Ikeda, Usune, Kawada, Shirasawa, Kawaba, Komemaki, Momono, Azuma, Yunohara, Katashina, and Minakami were placed within the district. (1 town, 12 villages)
- April 1, 1896 (1 town, 16 villages)
- May 1, 1908 - The villages of Kuga and Yunohara merged to form the village of Niiharu. (1 town, 15 villages)
- October 10, 1947 - The village of Minakami gained town status to become the town of Minakami. (2 towns, 14 villages)
- April 1, 1954 - The town of Numata and the villages of Tonami, Ikeda, Usune, and Kawada merged to form the city of Numata. (1 town, 10 villages)
- April 1, 1955 - The villages of Komemaki and Monono merged to form the town of Tsukiyono. (2 towns, 8 villages)
- September 30, 1956 - The villages of Azuma and Akagine merged to form the village of Tone. (2 towns, 7 villages)
- November 1, 1958 - The villages of Kuroho and Itonose merged to form the village of Shōwa. (2 towns, 6 villages)
- February 13, 2005 - The villages of Shirasawa and Tone merged into the city of Numata. (2 towns, 4 villages)
- October 1, 2005 - The towns of Tsukiyono and (former) Minakami, and the village of Niiharu merged to form the town of Minakami. (1 town, 3 villages)