 Annaka Town was created within Usui District, Gunma Prefecture on April 1, 1889, with the creation of the municipalities system after the Meiji Restoration.On March 1, 1955, Annaka merged with neighboring Haraichi, Isobe, and Itahana towns, and Higashiyokono, Iwanoya, Akima, and Gokan villages.It was raised to city status on November 1, 1958.