The Owari Onkunitama Jinja, an important Shinto shrine located within the borders of the present city, also dates from this period.

During the Edo period, Inaba and Ozawa villages formed a post town on the Minoji, a kaidō connecting Miya-juku (Atsuta on the Tōkaidō to Tarui-juku (Mino Province) on the Nakasendō.

The area of the town was expanded in 1907 and 1955 through the annexation of neighboring villages, and on November 1, 1958, the Inazawa was elevated to city status.

Inazawa has a mayor-council form of government with a directly elected mayor and a unicameral city legislature of 26 members.

In terms of national politics, the city is part of Aichi District 9 of the lower house of the Diet of Japan.