Iōjima was a village in the Japanese prefecture of Tokyo. Its administrative area covered the whole island of Iwo Jima, one of the Volcano Islands. It existed from 1923 when the Ogasawara islands were organized into modern municipalities to 1952 when mainland Tokyo returned to Japanese sovereignty and Iwo Jima was put under US military administration. When the island was returned to Japan in 1968 it became part of the village of Ogasawara, Tokyo.