Bank Routing Numbers

U.S. Bank Routing Number Database

A bank routing number, or ABA number is a nine digit bank routing number code, used in the United States, which appears on the bottom of negotiable instruments such as checks identifying the financial institution on which it was drawn. This code is also used by Federal Reserve Banks to process Federal wire fund transfers and by the Automated Clearing House (ACH) to process direct deposits and other automated bank wire transfers. The bank routing number is derived from the bank's transit number originated by the American Bankers Association (ABA), which designed it in the year 1910.

Since 1911, the American Bankers Association has assigned bank routing numbers through a series of registrars, currently Accuity. Accuity is responsible for assigning new ABA numbers. Accuity publishes the ABA Number Directory in the American Bankers Association Key to Bank Routing Numbers semi-annually.

There are over 22,000 active bank routing and transit numbers currently in our ACH database. Every financial institution in the United States of America has at least one of these bank routing numbers.