Sagamihara is a city in Kanagawa Prefecture, Japan. As of 1 May 2021, the city has an estimated population of 723,470, with 334,812 households, and a population density of 1,220 persons per km2. The total area of the city is 328.91 square kilometres. Sagamihara is the third-most-populous city in the prefecture, after Yokohama and Kawasaki, and the fifth most populous suburb of the Greater Tokyo Area. Its northern neighbor is Machida, with which a cross-prefectural merger has been proposed.