The routing number is the nine-digit code at the bottom left of your check

When you look at the bottom of a check, you will see three groups of numbers separated by vertical lines. The first group on the left — always nine digits — is your routing number. It identifies which bank or credit union issued the check.

The routing number stays the same for every check you write from the same account. It does not change if you order new checks, move to a different branch, or update your address. It belongs to your bank, not to you or your account.

The second group of numbers is your account number, which is unique to your specific account at that bank. The third group is the check number — the sequential number printed in the top right corner as well.

Key Takeaways

  • The routing number is always the first set of nine digits at the bottom left of a check, before the account number.
  • Your routing number identifies your specific bank or credit union and remains the same across all your checks.
  • You need the routing number when setting up direct deposit, arranging automatic payments, or receiving wire transfers.
  • If you cannot find a check, you can call your bank's customer service line and ask for your routing number by phone.

Why banks print the routing number on checks

The routing number tells the banking system where to send money. When you write a check, the person who deposits it needs to know which bank holds your account so the funds can be pulled from the right place. Without it, the check cannot be processed.

Banks also use routing numbers to sort checks during the clearing process — the system that moves money between banks. Machines read the routing number automatically, which is why it is printed in a special format at the bottom of the check.

What the nine digits mean

The routing number is divided into three parts, each with a specific purpose. The first four digits identify the Federal Reserve district and the bank's location. The next four digits identify the specific bank or credit union. The final digit is a check digit — a mathematical verification that the routing number is valid.

You do not need to memorize or understand these divisions to use your routing number. You only need to know where to find it and when to use it. However, understanding that each digit serves a purpose can help you catch mistakes if you write the number down incorrectly.

When you need to provide your routing number

You will need your routing number in several common situations. If your employer offers direct deposit, you will provide both your routing number and account number so paychecks go straight to your bank. If you set up automatic bill payments through your bank's website, you may need the routing number to authorize the transfer.

You also need it when receiving a wire transfer from another person or organization, or when setting up a transfer between your account at one bank and an account at a different bank. Some employers and government agencies ask for it when sending refunds or payments.

Finding your routing number without a check

If you do not have a check available, you can find your routing number by calling your bank's customer service line. The number is usually on the back of your debit card or on your bank statement. When you call, have your account number ready — the representative will verify your identity before sharing the routing number.

You can also log into your online banking account. Many banks display the routing number in the account details or transfer settings section. Some banks print it on statements as well, though not all do.

Routing numbers are different from SWIFT codes

If you are sending or receiving money internationally, you may hear about a SWIFT code instead of a routing number. A SWIFT code serves a similar purpose but is used for transfers between countries. It is longer than a routing number and includes letters as well as numbers.

For transfers within the United States, you always use the routing number. SWIFT codes are only needed for international wire transfers. If you are unsure which one you need, ask the person or organization requesting the information.

Protecting your routing number

Your routing number is not secret information — it appears on every check you write, and anyone who sees a check can see it. However, you should not share it casually or type it into unfamiliar websites.

Scammers sometimes use routing numbers to set up unauthorized automatic payments from your account. If someone asks for your routing number, verify that they are actually from your bank or a trusted organization before providing it. Your bank will never ask for your routing number by email or unsolicited phone call — they already have it.

Frequently Asked Questions

Can I use the routing number from an old check?

Yes. The routing number does not change when you order new checks or close an old checkbook. As long as the checks are from the same bank and account, the routing number remains the same. However, if you switched banks, you need the routing number from your new bank.

What if I write down the routing number wrong?

If you provide an incorrect routing number, the transaction will usually be rejected or delayed. The banking system will catch the error because the check digit at the end will not match. Contact your bank or the organization you sent the information to and provide the correct number.

Is the routing number the same at every branch of my bank?

Yes. All branches of the same bank share the same routing number. The routing number identifies the bank itself, not the individual branch. Your account number is what distinguishes your specific account from others at that bank.

Do credit unions have routing numbers?

Yes. Credit unions use routing numbers just like banks do. You will find the routing number in the same location on credit union checks — the first nine digits at the bottom left. Credit unions also participate in the same clearing system as banks.

Can someone steal money using just my routing number?

A routing number alone is not enough to steal money. Someone would also need your account number and typically your name and signature. However, do not share your routing number and account number together with people you do not trust, as that combination could be used to set up unauthorized payments.