The American Bankers Association routing number directory is available on the ABA website. ABA first developed the ABA routing number in 1910. The purpose of the routing number is to give a specific identification to a financial institution responsible for sending and receiving payments.
To access the ABA online lookup, navigate to the ABA Routing Numbers webpage. Look toward the right and click online lookup. That takes you to a page where you have to agree to the terms for access required by the ABA in order to use the online lookup. After scrolling down and reviewing the terms and conditions of use, click "I Agree" and then "Continue," to be taken to the ABA Routing Number Lookup page.
Once on that page, you can search for a financial institution by its ABA routing number or you can search for the institution’s routing number by entering the financial institution’s name and state. Including the city location or ZIP code is optional. You have to verify that you are not a robot by using the reCAPTCHA tool at the bottom of that webpage before you click Search to obtain your result. The ABA online lookup is useful for individuals who want to search for their financial institution’s routing number.