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city, Saitama ken (prefecture), Honshu, Japan. It lies along the Kurume River northwest of Tokyo. It was a post town known as Hizaori during the Tokugawa era (1603-1867); its name was changed to Asaka in 1932. The city has been a centre of the copper-rolling industry since the late 19th century. Connected by rail with Tokyo, it is now a residential suburb of the Tokyo-Yokohama metropolitan area. Asaka is also the site of a large military base. Pop. (2005) 124,393.