Town that includes the name 'Koyama' is the former Oaza Koyama, Yamashinacho Town, that was reorganized into the twenty towns when it was integrated into Higashiyamaku Ward in 1931.
「小山」を冠称する町名はもとの山科町大字小山で、昭和6年、当時の東山区へ編入された際、20町に編成された。