Your account number is the second set of digits on the bottom left of the check
The bottom of a check contains three separate number sequences, printed in magnetic ink. Reading from left to right, you see the routing number first (nine digits), then your account number (typically eight to twelve digits), and finally the check number (three to four digits) on the far right. Your account number is always the middle group.
The account number identifies your specific checking account at your bank. It stays the same across all checks from that account, so every check you write will have the identical account number printed on it. If you have multiple accounts at the same bank, each one has its own account number.
You need this number when you set up direct deposit, arrange wire transfers, or give payment instructions to someone who will deposit a check on your behalf. It is also the number to provide if a payment fails and you need to troubleshoot with your bank or the organization trying to pay you.
Key Takeaways
- Your account number is the middle sequence of three number groups printed on the bottom of your check, typically eight to twelve digits long.
- The routing number comes first (nine digits), the account number comes second, and the check number appears on the far right.
- All checks from the same account share the same account number, even though each individual check has a unique check number.
- You will need your account number to set up direct deposit, authorize electronic payments, or provide banking details to employers or payment services.
How the three numbers work together
The routing number tells the banking system which bank holds your account. The account number tells that bank which specific account within their system is yours. The check number is simply a sequential identifier for that individual check—it helps you and your bank track which check is which when you are reconciling your account.
When someone deposits a check you wrote, the bank reads all three numbers. The routing number directs the check to your bank, the account number directs it to your account, and the check number creates a record of the transaction. If any of these three numbers is wrong or illegible, the deposit may fail or be delayed.
What to do if you cannot read the numbers clearly
If the numbers on your check are faded, smudged, or difficult to read, do not guess. Contact your bank directly—by phone, through their website, or in person at a branch—and ask them to confirm your account number. They will verify your identity and provide the correct number.
You can also log into your online banking account, where your account number is usually displayed on the account summary or account details page. Many banks also print your account number on statements, deposit slips, and other account documents.
If you have lost all your checks and need your account number urgently, your bank can provide it immediately over the phone or through their app. You do not need to wait for new checks to arrive.
Account numbers and online payments
When you pay a bill online or set up automatic payments, you will often be asked for your account number and routing number. This is the same account number from your check. Some payment systems ask you to enter it manually; others let you photograph or upload a check image and extract the numbers automatically.
If you are entering the number by hand, take care to type it correctly. A single digit wrong will cause the payment to fail or go to the wrong account. If you are unsure, verify the number against your check or your bank's records before confirming the payment.
Account numbers on different check types
Personal checks, business checks, and cashier's checks all have account numbers printed on them in the same location—the bottom left, as the middle sequence of three number groups. The format is identical regardless of check type.
However, if you order new checks from a third-party printer rather than your bank, make sure the printer has your correct account number. Errors in printing are rare but do happen. When your new checks arrive, verify that the account number matches the number on your old checks or your bank records before you use them.
Protecting your account number
Your account number is not a secret in the same way your PIN or password is. It appears on every check you write, and anyone who receives a check from you will see it. However, you should still avoid sharing it unnecessarily or posting images of checks online.
If you are mailing a check, the account number is visible to anyone handling the mail. If you are concerned about security, you can request that your bank issue checks with a partial account number printed on them—some banks offer this option. Ask your bank what security features are available on their checks.
Frequently Asked Questions
Is the account number the same on every check I write?
Yes. Every check from the same account has the same account number printed on it. The only number that changes from check to check is the check number itself, which appears on the far right of the bottom line.
Can I use the account number from an old check?
Yes, as long as the account is still open. Your account number does not change when you order new checks. If you closed that account and opened a new one, you will have a different account number.
What if I give someone the wrong account number by mistake?
Contact the person or organization immediately and provide the correct number. If they have already attempted a payment or transfer, call your bank to see if it can be stopped or reversed. The sooner you catch the error, the easier it is to fix.
Do I need both the routing number and account number to receive a direct deposit?
Yes. An employer or payment service needs both numbers to deposit money into your account. The routing number tells the system which bank, and the account number tells the bank which account within that bank is yours.
Can someone access my account with just the account number?
Not without additional information. Your account number alone is not enough to withdraw money or make unauthorized transfers. Banks require additional verification—such as your PIN, password, or other identifying information—before processing transactions.