Inasa District was created in the early Meiji cadastral reforms of April 1, 1889, and consisted at the time of two towns (Kito and Kanasashi) and six villages.
Iitani Village was annexed by Kanasashi, and the town renamed Inasa on April 1, 1953.
On April 1, 1955, Kito annexed Nakamura Village and was renamed Hosoe.
On July 1, 2005, the towns of Hosoe, Inasa and Mikkabi, along with the cities of Tenryū and Hamakita, the town of Haruno (from Shūchi District), the towns of Misakubo and Sakuma, the village of Tatsuyama (all from Iwata District), and the towns of Maisaka and Yūtō (both from Hamana District), were merged into the expanded city of Hamamatsu.
This Shizuoka Prefecture location article is a stub.