ABA Transit Number

Written By:
Paul Tracy
Updated August 5, 2020

What is an ABA Transit Number?

An ABA transit number is a unique identifier assigned to banking institutions by the American Bankers Association (ABA).

How Does an ABA Transit Number Work?

For those banks and banking institutions that qualify as account holders with the Federal Reserve, the ABA grants an identification number called an ABA transit number. A bank's ABA transit number has nine digits and always appears near the bottom left of its checks. The ABA transit number tells the Federal Reserve bank which commercial bank the associated funds will be withdrawn from.

The ABA transit number is followed by the individual account number and the number of the check itself. For instance, the bottom of check might read "623852453   1234567   001." The first nine digits make up the ABA transit number, the second seven digits are the account number, and the last three digits are the check number.

Why Does an ABA Transit Number Matter?

Commonly known as a routing number, a bank's ABA transit number facilitates the clearing of checks and transfer of funds to and from banks.