Usa District, Ōita

Usa (宇佐郡, Usa-gun^?) was a district located in Ōita Prefecture, 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.

Until March 30, 2005, the district had two towns:

On March 31, 2005 - the towns of Ajimu and Innai were merged into the expanded city of Usa. Therefore, Usa District was dissolved as a result of this merger.

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