National city routing number in Ohio?

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. You can also call the bank for help if needed.