Izumi-ku (泉区) is the northernmost ward of the city of Sendai, in Miyagi Prefecture, Japan. As of 1 July 2017, the ward had a population of 215,048 and a population density of 1470 persons per km2 in 90,336 households. The total area of the ward was 146.61 square kilometres (56.61 sq mi). Izumi-ku is the twelfth-largest ward in Japan in terms of area, and third-largest in Sendai (behind Aoba-ku and Taihaku-ku). Formerly the independent city of Izumi, the population of the area expanded extremely rapidly from the mid-1970s onwards as a bedroom community for central Sendai. In 1988, the city of Izumi was annexed by Sendai.