The town was founded on October 1, 2004 from the merger of the towns of Saihaku and Aimi.

April 1, 1889 - "Shimokawane Village" founded from the merger of three pre-Meiji villages.

The school was founded in January 2002 from the merger of Wainuiomata College and Parkway College.

The town was founded on March 1, 2005 from the merger of three towns in the district: Kashima, Rokusei, and Toriya.

The Institute was founded in 1994 from the merger of several nuclear energy industry organizations, the oldest of which was created in 1953.

Tenmabayashi Village was founded in 1889 from the merger of seven small hamlets.

Founded in 1911 from the merger of several smaller companies, Lilco grew to become one of the nation's biggest - and most troubled - utilities.

The university was founded in 1996 from the merger of several higher education institutions.

The club was founded in summer 2009, from the merger between two clubs, both of Serie D:

The town was founded on March 31, 1954 from the merger of the former villages of Yamaguchi and Nakagawa.