Wells Fargo Routing Numbers (By State & Territories) Washington, A routing number, also called the ABA routing transit number (ABA RTN), is a nine-digit code that indicates the financial institution you bank. Bank Routing Number Search. Partial/Full Name of the Bank e.g. Credit Union and Select the State (Don't change if not sure). All States, Alabama, Alaska, Arizona. Get routing numbers for Wells Fargo checking, savings, prepaid card, line of credit, and wire transfers or find your checking account number.