Paleolithic-era artefacts have been uncovered within the boundary of Ina, with one being the Mukaihara Site, located in the northeastern part of the town. A group of stone tools dating back approximately 25,000 years was discovered, forming part of paleolithic-era finds of the Omiya Plateau. Other paleolithic sites are Inashi Yashiki-ato and Tozakimae Sites, Kuboyama Site, Oyama Site, and Hara Site, where projectile-points, knife-shaped, and pyramid-shaped stone-tools made by pre-historic
homo sapiens were found.
Jomon-era finds have been discovered along the edges of the plateaus carved out by the
Ayase and Haraichinuma Rivers. At various sites, Jomon-era pottery, dwellings, hearth pits, shell middens, and enclosures, were found. Many villages dating to the middle Jomon period have been uncovered at Hara, Kita, Oyama, Shiku, and Komuro Tenjinmae. However, it is rare to uncover substantial habitations dating to the late Jomon period. One such late Jomon era site is the Honjo Site, which features a circular earthwork enclosure. Pottery sherds dating to the final Jomon stage have been discovered at Inashi Yashiki-ato, Oyama, and Mukaihara. There is a gap in the archeological record between the final Jomon period and the
Kofun era, with no
Yayoi era sites being uncovered in the vicinity. Early Kofun period finds have been unearthed at the Komuro Tenjinmae and Mukaihara sites. During the early
Edo period, Ina was home to the short-lived (1590–1619) Komuro Domain founded by
Ina Tadatsugu. It was afterward ruled as
hatamoto territory under the direct control of the
Tokugawa shogunate. The villages of Komuro and Kobari were created in
Kitaadachi District, Saitama with the establishment of the modern municipalities system on April 1, 1889. They were merged on July 15, 1943, to form the village of Ina. Ina was elevated to town status on November 1, 1970. ==Government==