The Taiwan Post Office bank card number is 19 digits.

The Postal Bank debit card number consists of 19 digits, the passbook account number consists of 18 digits, and the credit card number only has 16 digits.

The China Postal Savings Bank savings card number refers to the number on the user's bank card. Postal Bank debit cards start with "622188", "955100", and "622150", and passbooks start with "60".

The bank card number refers to the number code on the hard card issued by each bank. There are unified regulations on the business number segments between various commercial banks.