Ōra District, Gunma
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As of May, 2008, the district has an estimated population of 107,157 and a density of 810 persons/km². The total area is 132.32 km².
The district contains five towns:
All towns have been growing in industrial business, but not in tourism.
- April 1, 1889 - Due to the municipal status enforcement, the town of Tatebayashi and 21 villages were formed. (1 town, 21 villages)
- July 25, 1902 - The village of Koizumi gained town status. (2 towns, 20 villages)
- 1916 - Population: 83,319. Malaria Patients: 3,609.
- April 1, 1954 - The town of Tatebayashi and the villages of Satoya, Ōshima, Akabane, Rokugō, Minoya, Tatara, and Watarase merged to form the city of Tatebayashi. (1 town, 13 villages)
- February 1, 1955 - The villages of Nishiyada, Ebise, Ōgano, and Inara merged to form the town of Itakura. (2 towns, 9 villages)
- March 1, 1955 (2 towns, 6 villages)
- The villages of Takashima and Nakano merged to form the village of Nakashima.
- The villages of Chieda, Umeshima, and Sanuki merged to form the village of Meiwa.
- March 31, 1955 - The villages of Tominaga, Eiraku, and Nagae merged to form the village of Chiyoda. (2 towns, 4 villages)
- September 30, 1956 - Parts of the village of Chiyoda (areas of the former village of Nagae) merged into the village of Nakashima.
- January 1, 1957 - The village of Nakashima was renamed Ōra.
- March 31, 1957 - The town of Koizumi and the village of Ōkawa merged to form the town of Ōizumi. (2 towns, 3 villages)
- April 1, 1968 - The village of Ōra gained town status. (3 towns, 2 villages)
- April 1, 1982 - The village of Chiyoda gained town status. (4 towns, 1 village)
- October 1, 1998 - The village of Meiwa gained town status. (5 towns)