 On January 10, 1955 the village of Misato was annexed by Isesaki, followed by the villages of Nawa, Toyouke and Miyagō on March 25 of the same year.On January 1, 2005 the towns of Akabori and Sakai, and village of Azuma were incorporated into Isesaki.On April 1, 2007, Isesaki was proclaimed a special city ("tokureishi") with increased autonomy.