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ABA Number

What Is an ABA Number?

An ABA number, also known as an ABA routing number, is a nine-digit code assigned to banks and financial institutions in the United States. It was created by the American Bankers Association to help process checks and electronic transactions.

ABA numbers ensure financial transactions are directed to the correct bank.

Why It Matters

ABA numbers are essential for transferring funds between banks. They help financial systems accurately process payments such as direct deposits, bill payments, and wire transfers.

Without these numbers, financial institutions would have difficulty routing transactions correctly.

How ABA Numbers Work

The nine digits of an ABA number represent specific information about the bank, including the region and institution.

ABA numbers are commonly used for:

  • check processing
  • direct deposits
  • electronic transfers
  • automated clearing house transactions

Example

When setting up online bill payments, a bank may request your ABA routing number along with your account number.

ABA Number vs Routing Number

These terms generally refer to the same identifier used by U.S. banks.

FAQs About ABA Numbers

Where can I find my ABA number?
It is printed on the bottom of checks and listed in online banking.

Do banks have multiple ABA numbers?
Some large banks have multiple routing numbers for different regions.

Is an ABA number confidential?
It should be shared only for legitimate banking transactions.

Related Terms