The routing number is the first set of nine digits at the bottom left of your check, printed in a special magnetic ink

When you look at the bottom of a check, you will see three separate groups of numbers printed in that distinctive dark ink. The routing number — also called the ABA routing transit number — is always the leftmost group. It identifies which bank or credit union issued your check.

The routing number tells the banking system where to send money when someone deposits or cashes your check. It is not secret information; it appears on every check your bank prints for you, and you can share it without risk. The number that actually needs protecting is your account number, which comes next.

Key Takeaways

  • The routing number is the nine-digit group on the far left of the bottom line of your check, printed in magnetic ink.
  • Routing numbers are specific to each bank or credit union branch and are public information you can safely share.
  • You can also find your routing number on your bank's website, by calling the customer service number on the back of your debit card, or through online banking.
  • The routing number stays the same for all checks from the same bank account, even if you order new checks.

How to read the three number groups at the bottom of a check

The bottom of every check contains three distinct sections of numbers, each serving a different purpose in the payment system. Learning to spot them takes seconds once you know what you are looking for.

The first group — on the far left — is your routing number. It is always nine digits long. The middle group is your account number, which varies in length depending on your bank but is typically between 10 and 12 digits. The third group, on the far right, is the check number, which is usually four digits and also appears in the top right corner of the check.

The magnetic ink used to print these numbers allows sorting machines at processing centers to read them automatically. This is why the numbers look slightly different from the printed text elsewhere on the check — they are designed to be machine-readable, not just human-readable.

What your routing number tells the banking system

Your routing number is a geographic and institutional identifier. The first four digits narrow down the region of the country; the next four digits identify your specific bank or credit union; the final digit is a check digit that validates the entire number. Together, these nine digits tell any bank in the country exactly where to send your money.

If you move to a different state or switch banks, your routing number changes because it is tied to the specific institution that holds your account. However, if you stay with the same bank and straightforward reorder checks, the routing number remains identical. This is why you can use old checks as a reference even after ordering new ones from the same account.

Other places to find your routing number besides a check

You do not need a physical check in front of you to locate your routing number. Your bank makes this information available through multiple channels because you may need it for direct deposit, wire transfers, or setting up automatic payments.

Log into your online banking portal or mobile app — most banks display the routing number in the account details section. Call the customer service number on the back of your debit card and ask; they can read it to you in under a minute. Visit your bank's website and search for "routing number" — most institutions have a dedicated page where you can look it up by branch location. You can also visit your local branch in person and ask a teller to write it down for you.

Why routing numbers are safe to share

The routing number is public information by design. It appears on every check you write, and anyone who receives a check from you can see it. Sharing your routing number with your employer for direct deposit, with a service provider for automatic bill payments, or with anyone else who needs to send you money poses no security risk on its own.

What you must protect is your account number and the check number. Someone with both your routing number and account number could potentially set up unauthorized transfers or payments from your account. Never share your full account number or check number with people you do not trust completely. If you are setting up direct deposit or automatic payments, the company requesting the information should have a find form or encrypted connection — look for "https://" in the web address and a lock icon in your browser.

Routing numbers for different types of accounts

Most people have one routing number for all their accounts at a single bank, but this is not always the case. If you have a checking account and a savings account at the same bank, they typically share the same routing number. However, if you bank at multiple institutions, each one has its own routing number.

Credit unions use routing numbers just like banks do, and the format is identical — nine digits at the bottom left of a check. Online banks that issue checks also print routing numbers on them, though some online banks do not offer checks at all. If your bank is a subsidiary or division of a larger institution, your checks may carry the parent company's routing number rather than a separate one.

What to do if you cannot find the routing number on your check

Occasionally a check may be printed incorrectly or the magnetic ink may be faded or smudged, making the routing number difficult to read. If this happens, do not guess — an incorrect routing number will cause a deposit or transfer to fail or go to the wrong bank.

Contact your bank directly using the phone number on your debit card or the number listed on your bank's official website. Do not use a phone number from a search result or an email link, as these could be fraudulent. Your bank can confirm your routing number in seconds and can also tell you if there is a problem with how your checks were printed. If multiple checks have printing errors, request a replacement batch from your bank.

Frequently Asked Questions

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

Yes. If you know someone's routing number and account number, you can set up a transfer or automatic payment to their account. This is how direct deposit works — your employer uses your routing and account numbers to deposit your paycheck. Always verify the numbers are correct before authorizing a transfer, because sending money to the wrong account is difficult to reverse.

Do all checks from the same bank have the same routing number?

Usually yes, but not always. Most banks use one routing number for all branches nationwide. However, some large banks or banks that have merged may use different routing numbers for different regions or divisions. If you have multiple accounts at the same bank, check the bottom of each checkbook to confirm they match.

What if my check is damaged and I cannot read the routing number?

Call your bank's customer service line using the number on your debit card or statement. They can read your routing number to you over the phone. You can also log into online banking or visit your bank's website to find it. Never attempt to guess or use a routing number from a different check if you are uncertain.

Is the routing number the same for wire transfers and ACH transfers?

The routing number you see on your check works for most transfers, but wire transfers sometimes require a different code called a SWIFT code or wire routing number. Ask your bank which number to use for the specific type of transfer you are making — they are usually different, and using the wrong one will cause the transfer to fail.