China Construction Bank: 4367 or 6227; Agricultural Bank: 6228 or 9559; ICBC: 6222 or 9558; Bank of China: 6216,4563,6013; The area code of collection account refers to the division of regions by banks, and different banks are different. If you use this to distinguish ownership, you can inform the payee after inquiring when transferring money. Usually, users can query the area code of their bank card account, but they can't query the area code of others. Be sure to fill in all kinds of information carefully when transferring money.
You can find it by calling the customer service phone of your bank.
You can also consult the staff at the bank outlets.