Izumi Ward is located in eastern Kanagawa Prefecture, and on the central-western borders of the city of Yokohama.

Under the Nara period Ritsuryō system, it became part of Kamakura and Kōza Districts in Sagami Province.

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

In 1996, in conjunction with the San Diego-Yokohama sister city relationship, Sotetsu Real Estate Co., Ltd. developed and constructed ten imported housing units, using construction documents and building materials from the United States, with a San Diego theme and style.

The project was called San Diego Street of Dreams, in total, 30 such import housing units were constructed and still remain today in Ryokuentoshi, Izumi-ku.