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.
A bank may also refer to its routing number as its routing transit number or use the acronym RTN. Some institutions, including credit unions and banks, possess multiple routing numbers, usually to identify different branches and/or geographical regions.
Wire transfers and Automated Clearing House transfers are the most common types of transactions using the routing transfer numbers.