American Bankers Association (ABA) Transit Routing Number

The unique number devised by the American Bankers Association (ABA) in 1910 that identifies the bank issuer of depository accounts, It is a 10-digit number (nine digits and a verification digit) issued by the Federal Reserve Bank to identify each bank by a bank identification number. This number (also called the ABA number is the routing transit number) has changed over the years to accommodate such things as the Federal Reserve System, the advent of MICR, and the implementation of the EFAA also known as Expedited Funds Availability Act. It is used both in check processing and in the ACH also known as Automated Clearing House routing of electronic checking account debits. The number is usually the first sequence of numbers preceding an account number at the bottom of a check.

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