Aio, Yamaguchi
Aio was a town located in Yoshiki District, Yamaguchi Prefecture, Japan.
As of 2003, the town had an estimated population of 7,801 and a density of 323.83 persons per km². The total area was 24.09 km².
On October 1, 2005, Aio, along with the town of Tokuji, and the towns of Ajisu and Ogōri, was merged into the expanded city of Yamaguchi.