Find Bank ABA Routing Number (USA)

What is ABA Routing Number?

An ABA number (also known as a routing number or routing transfer number) is a nine-character sequence used by banks to find specific financial institutions in the United States.

History of ABA Routing Number

The American Bankers Association created the ABA routing number in 1910. The ABA routing number has evolved over time to accommodate the Federal Reserve System, the introduction of MICR, the Expedited Funds Availability Act, and Check 21.

Usage of ABA Routing Number

An ABA number is required for wire transfers and electronic automatic clearing house (ACH) transactions such as

• Electronic funds transfer.
• Direct deposit.
• Direct payment of consumer bills.
• E-checks, and tax payments.

Formation of the ABA Routing Number:

The formation of ABA routing number is as follows:

• The first four digits represent the Federal Reserve symbol.
• The next two digits specify which Federal Reserve Bank electronic and wire transfers will be routed through.
• The next digit represents the cheque processing center identifier.
• The next digit represents the bank district identifier and.
• The last digit represent the cheque digit.

How to Find an ABA Routing Number?

The ABA routing number can be found at the bottom of your checks. The ABA Routing Number is the first number on the left, followed by your account number and the check number.

How to Obtain an ABA Routing Number?

The official registrar of ABA Routing Numbers is LexisNexis Risk Solutions. To be assigned an ABA routing number, a newly formed financial institution must complete and submit an application to LexisNexis Risk Solutions.

Federal Reserve District

List of Federal Reserve District Codes for all US Banks

00 is used by the United States Government & 80 is used for traveler's checks.

Method of Calculating Chequesum

The cheque digit is the routing number's ninth digit and must meet the following criteria.

3(d1 + d4 + d7) + 7(d2 + d5 + d8) + (d3 + d6 + d9) mod 10 = 0
(Mod or modulo is the remainder of a division operation.)

As an example, the routing number of Bank Of America, Virginia is 011900571. So, according to the chequesum calculation method -

ABA PREFIX TABLE

This table is up to date as of 2020. One weakness of the current routing table arrangement is that various territories like American Samoa, Guam, Puerto Rico and the US Virgin Islands share the same routing code.