Wires and ACH: In the below table is a list of all of the KeyBank routing numbers. Note that I have bolded. Routing Number on Checks: The nine digit routing number is the first group of numbers on the bottom left corner of your check. The bank routing number on your. KEY BANK - Routing Numbers. What is a routing number? Your bank routing number is a 9-digit code used to identify a financial institution in a transaction.