You can verify a bank's unique nine-digit routing number by contacting the bank directly. Most banks have websites with their routing numbers published and phone numbers to contact them. Paper checks and deposit slips contain the routing number on the bottom of the document.What is a valid routing number?
Routing numbers are the nine digit numbers also know as an ABA number that is found on the bottom of check next to you account number. This identifies the bank and the region where the checks are cleared. If the routing number is valid, this does not mean the check is valid.