[8] Following launch, as of March 31, 2013, Suica – the most popular of the ten cards – became usable at 4,365 train stations and on approximately 21,000 buses nationwide.

[1] A golden brown and red service mark, consisting of the letters "IC" with a pantograph replacing the tittle of the "i" and wheels on the "c", is displayed at ticket gates, fare boxes, and point of sale systems (such as in convenience stores or restaurants) where any of the cards are accepted as a form of payment.

[8][9][10][11] PiTaPa is excluded from mutual usage agreements when used as digital currency (e-money) due to its implementation as post-pay system tied to a user's bank account rather than a prepaid, rechargeable card.

[12] Beginning in 2021, initially targeting Aomori, Akita, northern Iwate, Yamagata, and Gunma Prefectures, JR East introduced chīki renkei (地域連携, lit.

[23] Both located in the Greater Tokyo Area, these two systems support only PASMO and Suica, and have not yet been upgraded due to low ridership and the high cost of replacing aged equipment.