In the Kamakura period, housing land development advanced in Okazaki (Shirakawa), and the north side of the Shira-kawa River which was originally not in Shirakawa was included in its geographical coverage.
この時代には岡崎（白河）の住宅地化が進み、元来白河に含まれていなかった白川の北側もその地域的範疇に含めるようになる。