Your account number is the second set of digits printed on the bottom of a check, between the routing number and the check number.
When you look at the bottom left of a check, you'll see three groups of numbers separated by vertical lines. The first group is your bank's routing number (nine digits). The second group is your account number (typically 10 to 12 digits, though this varies by bank). The third group, on the far right, is the check number (usually four digits).
The account number identifies your specific checking account at that bank. It's the number you'll need when setting up direct deposit, arranging wire transfers, or giving payment instructions to someone who needs to deposit funds into your account. Unlike your routing number, which is the same for everyone at your bank, your account number is unique to you.
Key Takeaways
- The account number is always the middle set of digits on the bottom of a check, printed between the routing number and the check number.
- Account numbers are typically 10 to 12 digits long, though the exact length depends on your bank.
- You need your account number whenever someone wants to deposit money directly into your account or when you're setting up automatic payments.
- Your account number is private information—treat it the same way you would your debit card number when sharing it with others.
How the three numbers work together
The routing number tells the banking system which bank to send the money to. The account number tells that bank which account within the bank should receive the funds. The check number is straightforward a reference for you and your bank to track which specific check was used for a transaction.
When you write a check or provide your banking information for a deposit, both the routing number and account number are required. Without the account number, the bank knows where to send the money but not where it should land. This is why both numbers appear on every check your bank issues to you.
Why account numbers vary in length
Different banks use different account numbering systems. Some banks assign 10-digit account numbers, others use 11 or 12 digits. A few regional banks may use different lengths. The length doesn't affect how the account works—it's straightforward how that particular bank's system is structured.
If you're unsure whether you've copied your account number correctly, count the digits and compare them to what your bank shows in online banking or on your account statements. Your bank's website or mobile app will always display your account number accurately if you log in.
Where else to find your account number
Your checks are not the only place your account number appears. You'll also find it on bank statements (usually at the top or bottom of the page), in your online banking portal, on your debit card (sometimes), and in any paperwork your bank sent you when you opened the account.
If you've run out of checks or don't have one handy, logging into your bank's website or calling the customer service number on the back of your debit card will get you your account number in seconds. You don't need a physical check to access this information.
Protecting your account number
Your account number is sensitive information. While it's not as critical as your PIN or password, you should still be cautious about who you share it with. Give your account number only to people or organizations you trust—your employer for direct deposit, your landlord for rent payments, or your utility company for bill payments.
Never share your account number via email or text unless you initiated the contact and you're certain you're communicating with a legitimate organization. Scammers sometimes pose as banks or service providers to collect account numbers. If someone calls or emails asking for your account number unsolicited, hang up or delete the message and contact your bank directly using the number on your debit card or statement.
What to do if you can't read your account number
If the numbers on your check are faded, smudged, or otherwise hard to read, don't guess. Contact your bank directly—call the number on your debit card, visit a branch, or log into online banking. Reading the wrong number could send money to the wrong account or cause a payment to fail.
If you've written checks with illegible account numbers, order a new set of checks from your bank. Banks can reprint checks at no cost or for a small fee, depending on your account type and how quickly you need them.
Frequently Asked Questions
Is the account number the same as the check number?
No. The check number is the third set of digits on the far right of the bottom line. It's a unique identifier for that specific check. Your account number is the middle set of digits and stays the same across all your checks.
Can someone access my account with just my account number?
Your account number alone is not enough to withdraw money or make unauthorized transfers. A thief would also need your routing number, PIN, password, or other verification. That said, keep your account number private because it's one piece of information someone might combine with other data to commit fraud.
Do I need my account number to deposit a check?
No. When you deposit a check at an ATM or through mobile deposit, the bank reads the routing and account numbers printed on the check itself. You don't need to enter them manually. If you're depositing someone else's check into your account, the bank uses the information on that check to route the funds correctly.
What if my checks show a different account number than my online banking?
Contact your bank when ready. This is unusual and could indicate an error in how your checks were printed or a problem with your account. Your bank can verify which number is correct and reissue checks if needed.
Can I use my account number instead of a debit card?
You can use your account number and routing number to make payments or set up direct deposits, but you cannot use it to withdraw cash or make purchases the way you would with a debit card. Your account number is for transfers and deposits, not for everyday spending.