Oda District, OkayamaOda is a district located in Okayama Prefecture, Japan.As of 2003, the district has an estimated population of 21,285 and a population density of 130.33 persons per km2. The total area is 163.32 km2.Towns and villagesYakageMergerOn March 1, 2005, the town of Bisei merged into the city of Ibara.