An ABA number is a nine-digit code that identifies which bank holds your account

The ABA number, also called a routing number, tells the banking system where to send money when you receive a wire transfer, direct deposit, or automatic payment. Every bank in the United States has its own ABA number. When you give someone your banking details to send you money, you are giving them your ABA number so their bank knows which institution to route the funds to.

ABA stands for American Bankers Association, the organization that originally assigned these codes. The number itself does not identify you personally—it identifies your bank. Your account number is separate and identifies which specific account at that bank receives the money.

You will see ABA numbers called different things depending on the context. Banks often use "routing number" and "ABA number" interchangeably. The Federal Reserve calls it a routing transit number. On checks, it appears as the first set of numbers in the bottom left corner. All these terms refer to the same nine-digit code.

Key Takeaways

  • An ABA number is a nine-digit code that identifies your specific bank, not your account or personal information.
  • You need your ABA number whenever you set up direct deposit, wire transfers, or automatic bill payments.
  • You can find your ABA number on the bottom left of your checks, on your bank's website, or by calling your bank.
  • Different branches of the same bank may have different ABA numbers, so confirm you have the correct one for your specific branch.

Where to find your ABA number

The easiest place to find your ABA number is on a check from your account. Look at the bottom left corner. The first group of numbers, usually nine digits, is your ABA number. The second group is your account number.

If you do not have checks, log into your bank's website or mobile app. Most banks display the routing number in the account details section, sometimes labeled "routing number," "ABA number," or "transit number." You can also call your bank's customer service line and ask for your routing number—they will give it to you over the phone.

Some banks post routing numbers on their website's FAQ or help section. If you know your bank's name and your branch location, you can also search online for "[bank name] routing number [your state]" to find it quickly.

When you need to provide your ABA number

You will need your ABA number whenever someone or an organization needs to send money directly into your bank account. This includes setting up direct deposit for paychecks, receiving tax refunds, or getting insurance payouts. Government agencies like the IRS and state tax authorities ask for your ABA number and account number to deposit refunds electronically.

You also provide your ABA number when you set up automatic bill payments from your bank account, arrange wire transfers, or receive payments from employers, benefits programs, or other sources. Any time money moves electronically into your account, the sending institution needs to know which bank to send it to—that is what the ABA number does.

Sharing your ABA number is safe. It is public information that appears on every check you write. Someone cannot access your account or withdraw money using only your ABA number and account number—they would also need authorization from your bank or from you directly.

ABA numbers and branch locations

Large banks with many branches often assign different ABA numbers to different locations. If you have an account at a specific branch, that branch may have its own routing number. This matters because if you provide the wrong routing number, your deposit might be delayed or sent to the wrong branch.

When you set up direct deposit or wire transfers, ask your bank whether you should use the main routing number or your branch's specific routing number. Most of the time, the main routing number works for all branches, but some banks and some types of accounts require the branch-specific number.

If you switch banks or move to a different branch of the same bank, your ABA number may change. Always confirm your current routing number before setting up any new electronic transfers.

How ABA numbers work in the banking system

When you receive a direct deposit or wire transfer, the sending bank uses your ABA number to route the money through the Federal Reserve's payment system to your bank. The Federal Reserve maintains a database of all ABA numbers and which banks they belong to. The sending bank looks up your ABA number, finds your bank, and sends the funds there. Your bank then uses your account number to deposit the money into your specific account.

This system processes millions of transactions daily. The ABA number ensures that money sent from any bank in the country reaches the correct destination bank, even if the banks have never dealt with each other before. Without standardized routing numbers, the banking system would have no way to know where to send electronic payments.

The nine digits in an ABA number are not random. The first four digits identify the Federal Reserve district and the bank itself. The next four digits identify the specific branch or processing center. The final digit is a check digit that the system uses to verify the number is correct.

What to do if you cannot find your ABA number

If you cannot locate your routing number through your checks or online banking, call your bank's customer service number. You can find this number on your bank's website or on any statements you have received. Have your account number ready when you call, and ask for your routing number. The representative will provide it immediately.

If you are setting up direct deposit for a paycheck or government payment and your bank is not responding quickly, ask your employer or the government agency for help. Many payroll departments and government offices have access to routing number databases and can look it up for you. You can also search online using your bank's name and your state—most routing numbers are publicly available through banking databases.

Do not guess or use a routing number you are not certain about. An incorrect routing number can delay your deposit by several days or send the money to the wrong bank entirely. It is always better to take an extra few minutes to confirm the correct number.

Frequently Asked Questions

Is my ABA number the same as my account number?

No. Your ABA number identifies your bank; your account number identifies your specific account at that bank. You need both pieces of information for electronic transfers. On a check, the ABA number appears first (bottom left), and the account number appears second.

Can someone steal money from my account if they have my ABA number and account number?

Not without additional authorization. Your ABA number and account number are not enough to withdraw money. A person would also need to be authorized by your bank or by you directly. However, do not share this information with people you do not trust, as it could be used for unauthorized transactions if combined with other information.

Do I need a different ABA number for savings and checking accounts?

Usually not. Most banks use the same routing number for all account types at a given branch. However, some banks assign different routing numbers to different products or services. Check with your bank if you have multiple accounts and are unsure whether they share the same routing number.

What happens if I use the wrong ABA number for a direct deposit?

The money will be sent to the wrong bank or branch. Your employer or the sending institution will eventually be notified of the error, and the funds should be returned to them. This can delay your deposit by several days or longer. Always confirm your routing number before setting up direct deposit.

Can I find someone else's ABA number online?

Yes, ABA numbers are public information. You can search online for any bank's routing number by bank name and state. This is why sharing your ABA number is safe—it does not expose any private information about your account.