The villages of Ōkawa and Koizumi were created within Ōra District, Gunma Prefecture on April 1, 1889 with the creation of the modern municipalities system after the Meiji Restoration. Koizumi was elevated to town status on July 25, 1902.
The villages of Ōkawa and Koizumi were established within Ōra District, Gunma Prefecture on April 1, 1889 as part of the modern municipality system following the Meiji Restoration. Koizumi was upgraded to town status on July 25, 1902.