Ōsato District, Saitama
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- On October 1, 2005, the towns of Ōsato and Menuma merged into the city of Kumagaya.
- On January 1, 2006, the towns of Hanazono, Kawamoto and Okabe merged into the city of Fukaya.
- On February 13, 2007, the town of Kōnan merged into the city of Kumagaya.
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