In addition to the three major barrier stations, several other barriers were also erected, including: along the Tokaido Road, the Ashigara no seki Barrier on the border of Suruga and Sagami Provinces and the Nakoso barrier on the border of Hitachi and Mutsu Provinces; along the Tosando Road, the Usui-toge Pass Barrier on the border of Shinano and Kozuke Provinces and the Shirakawa-no-seki Barrier on the border of Shimotsuke and Hitachi Provinces; and along the Hokurikudo Road, the Nezumigaseki Barrier on the border of Echigo and Dewa Provinces.
三関のほか、東海道の駿河・相模国境には足柄関、同じく東海道の常陸・陸奥国境には勿来、東山道の信濃・上野国境には碓氷峠、同じく東山道の下野・陸奥国境には白河関、北陸道の越後・出羽国境には鼠ヶ関がそれぞれ設置された。