ABA is your bank's routing number, printed on the bottom left of your checks

ABA stands for American Bankers Association, the organization that created the routing number system. The ABA number itself is a nine-digit code that identifies which bank holds your account. When you write a check or set up a direct deposit, the ABA number tells the payment system exactly where to send or pull the money.

You'll see it printed on the bottom left corner of your checks, before your account number. It looks like this: the first three digits identify the Federal Reserve district, the next three identify your specific bank, and the last three identify the branch where your account is held. If you don't have checks, your bank can tell you the number in seconds, or you can find it on your bank's website.

The ABA number is different from your account number. Your account number identifies you as an individual customer; the ABA number identifies your bank. Both are needed together to move money in or out of your account.

Key Takeaways

  • ABA numbers are nine-digit routing codes that identify your specific bank and branch, not your individual account.
  • You need your ABA number to set up direct deposit, receive wire transfers, or process automatic bill payments.
  • The ABA number appears on the bottom left of paper checks and is available from your bank's website or customer service.
  • Different branches of the same bank may have different ABA numbers, so always confirm you have the correct one for your location.

Where to find your ABA number

The easiest place is the bottom left of any check you have. The nine-digit number printed there is your ABA routing number. If you don't have checks or can't locate them, log into your bank's website and look for account details or routing information — most banks display it prominently.

You can also call your bank's customer service line and ask for your routing number. Have your account number ready when you call. Some banks print the routing number on statements or deposit slips as well.

If you're looking for a bank's ABA number but don't have an account there, the Federal Reserve maintains a searchable database of all ABA numbers. You can search by bank name and state to find the routing number for any branch.

When you need to provide your ABA number

Direct deposit is the most common reason. When you start a new job or set up payroll, your employer needs both your ABA number and account number to deposit your paycheck into the right account at the right bank.

Wire transfers also require your ABA number. If someone is sending you money by wire, they'll need to give their bank your ABA number and account number so the funds reach you. The same applies if you're sending money out — you'll provide the recipient's ABA number and account number to your bank.

Automatic bill payments and recurring transfers use your ABA number too. When you set up automatic payments to a credit card, mortgage, or utility company, the system uses your ABA number to pull money from the correct account. ACH transfers — the electronic system that moves money between banks — also require your ABA number.

ABA numbers and bank mergers

When banks merge or are acquired, routing numbers sometimes change. If your bank is acquired by a larger institution, you may be assigned a new ABA number. Your bank will notify you of this change and give you time to update any automatic payments or direct deposits.

If you have automatic payments set up and your bank's routing number changes, contact each company you pay to update the information. Failing to do so can cause payments to fail or be delayed. Your bank will usually provide a grace period where both the old and new routing numbers work, but don't rely on that — update as soon as you're notified.

ABA numbers for different account types

Your checking account and savings account at the same bank usually share the same ABA number. The routing number identifies the bank and branch, not the type of account. Your account number is what distinguishes between your checking and savings accounts.

However, if you have accounts at different branches of the same bank, the ABA numbers may differ. Some large banks use different routing numbers for different regions or branches. Always confirm you're using the correct routing number for the specific branch where your account is held.

What happens if you use the wrong ABA number

If you provide an incorrect ABA number for direct deposit or a wire transfer, the money may go to the wrong bank or the wrong account. The payment system relies on the ABA number to route funds, so an error here can send money somewhere you didn't intend.

If this happens, contact your bank immediately. They can sometimes trace the payment and recover it, but the process takes time — often several business days. For direct deposit, notify your employer right away so they can resubmit the payment with the correct routing number.

To avoid this, always double-check your ABA number before submitting it. Verify it against a check, your bank's website, or a call to customer service. It's a nine-digit number with no letters, and it should match what your bank confirms.

Frequently Asked Questions

Is my ABA number the same as my bank's main routing number?

Not always. Large banks may have different ABA numbers for different regions or branches. Your specific ABA number is tied to the branch where your account is held. Always use the routing number for your branch, not the bank's main number, to avoid delays or misdirected payments.

Can I use someone else's ABA number to send them money?

Yes. If you're sending a wire transfer or ACH payment to someone, you need their ABA number and account number. Their ABA number tells your bank which bank to send the money to; their account number tells that bank which customer to credit. You cannot access their account with just the routing number.

Do I need my ABA number to use an ATM or debit card?

No. ATMs and debit cards use your account number and PIN or card number, not your routing number. Your ABA number is only needed for transfers between banks, direct deposits, and bill payments — not for everyday transactions at your own bank.

What if my bank doesn't have a routing number?

All banks in the United States have ABA routing numbers. If your bank says it doesn't, contact the Federal Reserve or ask your bank to provide it. Online banks and credit unions also have routing numbers, though credit unions may call theirs a transit number.

Can my ABA number change if I move to a different state?

Only if you move your account to a different branch in a different state. If you keep your account at the same branch, your ABA number stays the same even if you move. If you open a new account at a branch in another state, that branch will have its own ABA number.