Nihonmatsu Domain
The area of present-day Ōtama was part of ancient Mutsu Province and the area has many burial mounds from the Kofun period. The area formed part of the holdings of Nihonmatsu Domain during the Edo period. After the Meiji Restoration, it was organized as part of Nakadōri region of Iwaki Province, administratively within Adachi District. The villages of Oyama and Tamanoi were established on April 1, 1899 with the creation of the modern municipalities system. Ōtama Village was formed on March 31, 1955 with the merger of the two villages.