PIN Numbers by CALSF
There is a bit of a controversy on how many digits an ATM PIN number should be: four or six. For years the PIN numbers that Paris's ATM's accepted were four digits. However, with the merger of many different banks, you may be required to have a six digit PIN number. For example, Bank of America always required a four digit PIN code. Nowadays the PIN code may be six digits long since B of A's recent merger with Fleet Bank.
I am a longtime client of B of A and my four digit PIN code is still acceptable. However, if I was a Fleet client my six digit PIN code is acceptable too.
The BNP Paribas ATM's that are affiliated with B of A in Paris usually accept four digits and may be accepting six now. Best thing is to verify with your bank as to the required amount of digits.