Usa District, Ōita
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Usa (宇佐郡 Usa-gun?) was a district located in Ōita, Japan.
As of 2003, the district had an estimated population of 12,739 and the density of 48.85 persons per km². The total area was 260.79 km².
[edit] District Timeline
The district dissolved on March 31, 2005 when the district merged with the city Usa to form the new city of Usa.