Midori Ward is located in eastern Kanagawa Prefecture, and on the northwest borders of the city of Yokohama.

During the Edo period, it was a rural region classified as tenryō territory controlled directly by the Tokugawa shogunate, but administered through various hatamoto.

In a major administrative reorganization of October 1, 1969, Midori emerged as an independent ward within the city of Yokohama.

Midori Ward is largely a regional commercial center and bedroom community for central Yokohama and Tokyo.

Yokohama Municipal Board of Education [ja] operates public elementary and junior high schools.