Onsen District, Ehime
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Onsen (温泉郡; -gun) was a district located in Ehime, Japan. On January 1, 2005 the town of Nakajima merged into the city of Matsuyama and both the town and district no longer exist.
As of 2003, the district had an estimated population of 40,690 and a density of 163.59 persons per km². The total area was 248.73 km².