 Kisarazu City was merged expanded through merger with neighboring Aoyagi Town on March 31, 1955, and again through merger with Amaha Town and Osawa Town on April 25, 1971.Kisarazu has a mixed economy based on commercial fishing, agriculture, and heavy industry along its Tokyo Bay shoreline.It serves as the commercial center for central Bōsō Peninsula, and is increasingly a bedroom community for neighboring Kimitsu and the Kawasaki – Yokohama metropolis across Tokyo Bay.