What is an ABA number and how to find it? Complete guide

ABA stands for American Bankers Association, a trade association founded in 1875 to represent the interests of various players in the US Banking industry¹.

So how does the ABA number come into all this? Stick with us as we explain what an ABA number is, what makes it similar or different from a routing number, where you can find it and how it works.

What is an ABA number?

An ABA – also called a routing number – is used to identify banks in the United States.
This nine-digit code helps banks in the process of transferring money domestically between accounts for different kinds of transactions, for example, direct deposit or bank transfers. ABA routing numbers are also used to identify participating financial institutions in newer payment systems such as the FedNow Service, launched by the Federal Reserve in July 2023 for instant payments⁶.

Depending on factors such as location, mergers, or business line, a bank can have several ABA numbers — up to nine in addition to its principal office routing number, as set out in the ABA Routing Number Policy².

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Where can you find your ABA number?

There are a few different ways in which you can find the ABA number you should use:

• If you need the ABA number for an institution where you have a checking account, you can find it in your checkbook. The ABA number will be in the bottom left corner of your checks. However, your ABA number may not always be the routing number in that position on checks. If it isn't clear to you, make sure you call your bank and confirm³.
• You can also find out your ABA number by visiting your bank's website and going to the direct deposit or ACH section.
• If you've registered for online banking with your bank, you can log into your account and find the ABA number.
• You can also use the American Bankers Association's official online lookup tool to validate any US bank routing number³.
• There are also other online platforms, such as Wise, where you can find the ABA numbers for a wide range of banks.

It is important to remember that a bank may have different ABA numbers. Your ABA number will most likely rely on the bank location where you opened your account. Some banks also have differing ABA numbers depending on the purpose⁴.
You may find that the ABA number assigned to wire transfers is different from the one used for electronic bill payments, or even direct deposits. If you need clarity on these matters, don't hesitate to get in touch with a customer service agent from your bank.

How does the ABA number work?

An ABA number in a way points financial institutions to where they should find your account. Therefore, it's no surprise that these numbers may sometimes be called check routing numbers or routing transit numbers (RTNs).

These numbers are usually printed in magnetic ink or at least in magnetic ink character recognition code (MICR) font to make them easier to detect by computers and other specialized machines. The MICR font also enables check deposit by submitting a photo of the check.
Your ABA number is usually accompanied by your account number as the information given to whoever is trying to issue a payment. The rest of the work is commonly handled by the bank, a biller or an employer.

In case a bank closes or is taken up in a merger or acquisition, you might receive new ABA numbers. Sometimes you don't have to use them right away. You may continue using the old numbers indefinitely, or at least until you request new checks and services.
According to the official ABA Routing Number Policy, the 9-digit number is made up of three components², each with its own purpose:

Is ABA number the same thing as a routing number?

In short, it's a yes and no. A routing number is a nine-digit code that banks use to identify financial institutions when transacting with them. On the other hand, an ABA is used to identify financial institutions within the US, with additional eligibility conditions.

An ABA Routing Number can be issued only to a federal or state chartered financial institution that has been determined to be eligible for a master account by a Federal Reserve Bank³.

Is ABA code the same as SWIFT code?

SWIFT codes and ABA numbers are both used to identify the bank where the recipient has an account. However, while ABA numbers are used domestically, SWIFT codes are used when you transfer money internationally.

Which bank is ABA Bank?

In U.S. banking terms, there is no such thing as a bank called ABA – it is rather related to ABA codes. The closest bank with the name is located in Cambodia – which is backed by the National Bank of Canada.

What's the difference between ABA and wire?

For many payment types, the ABA routing number found on your checkbook will be what's needed. However, as we mentioned above, it's important to know if your bank uses a different routing number for different payment types.
In this case, your wire routing number might be different to the number found on your checks.
Some banks have a different wire routing number depending on whether the payment is being received in a foreign currency, USD, or an unknown currency.

Check directly with your bank to make sure you have all the details required to allow you to receive your wire payment safely.
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What is the wire transfer ABA number?

Your wire transfer number will be a 9-digit code, like the ABA number you find on your checks. It may even be the same as the number found on your checks — but some banks choose to use different routing numbers for different types of payments.
This might mean that your wire transfer ABA number is different to the one you'll use for ACH transfers. Check directly with your bank to make sure you have the correct ABA routing number for wire transfers.

Bottom line

All-in-all, the ABA number is very helpful when trying to make sure that funds are sent to the right person/establishment and more specifically, the right account. They make it easier for those processing payments to pinpoint the destination in what can sometimes be a confusing web of accounts.

The ABA number also simplifies the movement of money, since these movements can be classified according to their purpose/nature. Therefore, where there are variations in rules applied in say direct deposits, electronic bill payments, etc., they can be exercised in a faster and more organized manner.

However, it is crucial to always check multiple sources and confirm with a customer support representative that you are using the right ABA number before issuing a payment.

Sources:

1. American Bankers Association – About ABA
2. ABA – Routing Number Policy & Procedures (Section IV: Routing Number Structure)
3. ABA – ABA Routing Number: Find, Validate & Eligibility
4. Federal Reserve Financial Services – Key to Check Services Routing Numbers
5. Please see Terms of Use for your region or visit Wise Fees & Pricing: Only Pay for What You Use, for the most up-to-date pricing and fee information.
6. Federal Reserve Financial Services – About the FedNow Service
   Sources checked on 17 September 2026