Middle ages The area name of Yatomi appears in
Kamakura period documents, as part of ancient
Owari Province.
Early modern period During the
Edo period, the area was noted for raising ornamental
goldfish.
Late modern period During the
Meiji period, the area was organized into villages under Kasai District, Aichi Prefecture, with the establishment of the modern municipalities system. Kasai District later became
Ama District, Aichi. Yatomi was proclaimed a
town on August 26, 1903.
Contemporary history The
Isewan Typhoon of September 26, 1959, created extensive damage to the area. Efforts to merge Yatomi with the neighboring town of Kanie failed in 2004 over a dispute on the naming of the new entity. The city of Yatomi was founded on April 1, 2006, from the merger between the former town of Yatomi, absorbing the village of
Jūshiyama (both from
Ama District). ==Government==