In the system of giving a number to each station, which started in March 2007, A2 has not been assigned to any station, and it is considered that a plan to build a new station between this station and Sai Station (around the site where the former Mibu Station once existed) may exist, but no specific plan has been devised.
平成19年3月に正式に使用開始となった駅ナンバリングはA2が欠番となっており、当駅と西院駅の間（前述の旧・壬生駅付近）に新駅設置計画があることがうかがえるが、現在は特に具体化しているわけではない。