was a formerly a town located in Hoi District, Aichi, Japan.
As of November 1, 2007, (the last census information available) the town had an estimated population of 22,708 and a population density of 2,188.31 persons per km . The total area was 9.92 km .
On February 1, 2010 Kozakai merged with the city of Toyokawa. With this merger, Hoi District ceased to exist.
- October 1, 1889 - Toyoaki Village ( ) was founded.
- September 12, 1906 - Kozakai Village was founded by the unification of Toyoaki Village and Ina Village ( ).
- September 12, 1926 - Kozakai Town was founded.
- 1973 - Toyokawa Shinkin Bank Incident ( Toyokawa Shin'y Kinko Jiken) occurred.
- 1993 - Kozakai Town Cultural Hall ( ) was completed.
- February 1, 2010 - Kozakai merged with the city of Toyokawa.
- Kozakai Nishi Primary School
- Kozakai Higashi Primary School
Junior High school
- Kozakai Junior High School
- Kozakai Town Cultural Hall ( Kozakai-ch Bunka Kaikan ; commonly called "Freuden Hall")
- Utari Jinja ( )
- Gosha Inari ( )
- Ruins of Ina Castle ( )
Noted persons from Kozakai
- Yasuhiko Okada ( Okada Yasuhiko) - Former Administrative Vice-Minister of the Environment of Japan
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