A routing number is always exactly 9 digits long

Every bank routing number in the United States contains 9 digits, no more and no fewer. This is a fixed standard set by the American Bankers Association. If you see a routing number that is longer or shorter, it is not a valid routing number.

The 9 digits break down into three groups of 3 digits each, though they are usually written as one continuous string. The first four digits identify the Federal Reserve routing symbol, the next four identify the specific bank or credit union, and the final digit is a check digit that validates the entire number.

You will find your routing number on the bottom left of any check from your account, in your bank's online banking portal, or by calling your bank directly. If you are setting up a direct deposit for a tax refund, insurance payment, or other money coming to you, you will need this 9-digit number along with your account number.

Key Takeaways

  • A routing number is always 9 digits long; anything shorter or longer is incorrect.
  • The 9 digits are divided into three groups that identify the Federal Reserve district, the specific bank, and validate the number itself.
  • You can find your routing number on a check, in your online banking portal, or by calling your bank.
  • When setting up direct deposit for refunds or payments, double-check that you have entered all 9 digits correctly.

Where the 9 digits come from

The American Bankers Association established the 9-digit routing number format in the 1910s, long before electronic banking existed. The system was originally designed for sorting paper checks by hand, and the format has remained unchanged for over a century even as banking moved online.

The first four digits represent the Federal Reserve routing symbol — which of the 12 Federal Reserve districts the bank belongs to and which processing center handles its transactions. The next four digits are the bank's own identifier, assigned by the American Bankers Association. The final digit is a check digit, calculated using a mathematical formula that catches most typos or transposition errors.

This structure means that routing numbers are not random. If you know a bank's routing number, you can determine which Federal Reserve district it operates in and which bank it belongs to. However, you cannot simply guess a routing number — the check digit will fail if you have entered any of the first 8 digits incorrectly.

How to locate your 9-digit routing number

The easiest place to find your routing number is the bottom left corner of any check you have from your account. The first 9 digits printed there are your routing number, followed by your account number (which is usually longer) and then the check number.

If you do not have checks or prefer not to use them, log into your bank's online banking portal or mobile app. Most banks display your routing number in the account details or settings section, sometimes labeled as "bank routing number," "ABA number," or "transit number."

You can also call your bank's customer service line and ask for your routing number. Have your account number or the phone number associated with your account ready. Some banks will ask you to verify your identity before providing this information.

Why routing numbers matter for refunds and payments

When you set up direct deposit for a tax refund, stimulus payment, insurance refund, or paycheck, you provide both your routing number and your account number. The routing number tells the paying agency which bank to send the money to; the account number tells the bank which account within that bank should receive it.

Without the correct 9-digit routing number, the payment will either be rejected before it is sent, or it will be sent to the wrong bank entirely. If it goes to the wrong bank, it may take weeks to trace and recover. This is why double-checking both numbers before submitting is critical.

Some refunds and payments are sent by check or prepaid card instead of direct deposit, so you may not need a routing number for every payment. But for any direct deposit — whether from the IRS, your state tax authority, an insurance company, or an employer — you will need to provide this 9-digit number.

What to do if you enter the routing number wrong

If you have already submitted a direct deposit request with an incorrect routing number, contact the paying agency as soon as you notice the error. For tax refunds, contact the IRS or your state tax authority. For insurance refunds, contact the insurance company. For payroll, contact your employer's payroll department.

Most agencies can cancel or correct a direct deposit instruction before the payment is processed, which usually takes a few business days from the submission date. If the payment has already been sent to the wrong bank, the receiving bank will typically reject it and send it back to the paying agency, which then reissues it to the correct account. This process can add two to four weeks to your refund timeline.

To avoid this problem, verify your routing number against a check or your online banking portal before you submit any direct deposit form. Many forms also ask you to re-enter the number a second time as a check against typos.

Routing numbers versus account numbers

A routing number and an account number are two different things, and both are needed for direct deposit. The routing number is 9 digits and identifies your bank. The account number is usually 10 to 12 digits (though this varies by bank) and identifies your specific account within that bank.

On a check, the routing number appears first on the bottom left, followed by the account number, then the check number. Online banking portals usually display both numbers in the account details section. If you are unsure which number is which, call your bank and ask them to confirm both numbers over the phone.

Some people confuse the routing number with the bank's main phone number or the branch number. Neither of those is your routing number. Only the 9-digit number used for electronic transfers is the routing number you need for direct deposit.

Frequently Asked Questions

Can a routing number be different for different branches of the same bank?

No. All branches of the same bank share the same routing number. The routing number identifies the bank itself, not the individual branch. If you have accounts at two different branches of the same bank, both accounts use the same routing number.

What if my bank merged with another bank after I opened my account?

Your routing number may change after a merger, but your bank will notify you and update your account information. If you have direct deposits set up, contact the paying agency to update your routing number if your bank tells you it has changed. Do not assume your old routing number still works.

Is the routing number the same for checking and savings accounts?

Yes. Both your checking and savings accounts at the same bank use the same routing number. The account number is what distinguishes between the two accounts. When you set up direct deposit, the routing number directs the payment to your bank, and the account number directs it to the specific account.

Can I use a credit union routing number the same way as a bank routing number?

Yes. Credit unions have routing numbers in the same 9-digit format as banks. You use a credit union routing number exactly the same way you use a bank routing number for direct deposit. The process and format are identical.

What happens if I transpose two digits in my routing number?

The check digit at the end of the routing number will usually catch a transposition error, and the payment will be rejected before it is sent. However, if the transposition happens to produce a valid routing number for a different bank, the payment may be sent to that bank instead. This is why verifying the number carefully before submitting is important.