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The unique number devised by the American Bankers Association (ABA) in 1910 which serves to identify the bank issuer of depository accounts. The ABA Routing number (a.k.a. ABA Number, 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 Expedited funds Availability Act (EFAA). 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 is used both in check processing as well as the ACH (Automated Clearing House) routing of electronic checking account debits. This number is usually the first sequence of numbers preceding an account number at the bottom of a check. |