As of 1889, at the time of the establishment of the modern municipalities system, the area consisted of 21 towns and villages. Between the years 1955 and 1960, these were consolidated into the five towns of Date (formerly the villages of Nagaoka and Fushiguro), Hobara (formerly the town of Hobara and the villages of Ooda, Kamihobara, Hashirazawa, and Tominari), Ryōzen (formerly the villages of Ryozen, Kakeda, Oguni, and Ishido), Tsukidate (formerly the villages of Ote and Otegawa), and Yanagawa (formerly the town of Yanagawa and the villages of Awano, Sekimoto, Shirane, Ooeda, Isazawa, Tomino, and Yamafunyuu), which merged to create the modern city of Date on January 1, 2006.