Look at the bottom left corner of your checks. If you have a
Personal account the first sequence of numbers, usually a
nine-digit number, is your ABA (American Bankers Association)
routing number. If you have a Business account the ABA number will
follow the six-digit check number at the bottom of the check. The
ABA number is also known as a Routing and Transit Number, RTN, or
bank number. It was established by the American Bankers Association
to identify the accountholder's bank