From Wikipedia, the free encyclopedia
Ōsa (大佐町, Ōsa-chō?) was a town located in Atetsu District, Okayama, Japan. On March 31, 2005, Ōsa merged into the city of Niimi.
As of 2003, the town had an estimated population of 3,922 and a density of 32.35 persons per km². The total area was 121.25 km².