The account number is the second set of digits on the bottom left of your check
Your bank account number appears on the bottom of every check you write. It sits between two other numbers: the routing number on the far left, and the check number on the far right. The account number is typically 10 to 12 digits long, though the exact length varies by bank.
The three numbers are printed in a special magnetic ink called MICR (Magnetic Ink Character Recognition). This format lets banks read checks electronically during processing. You can read these numbers with your eyes just as easily as a machine can.
If you cannot find the account number on a physical check, you can also find it on your bank statement, in your online banking portal, or by calling your bank's customer service line. Your bank will confirm the number in seconds.
Key Takeaways
- The account number is the middle set of digits on the bottom of your check, between the routing number and the check number.
- Account numbers are typically 10 to 12 digits long, but the exact length depends on your bank.
- The three numbers at the bottom of a check are printed in special magnetic ink so banks can process checks electronically.
- If you do not have a check in front of you, your bank statement or online banking account will show your account number.
How to read the three numbers at the bottom of a check
The bottom left corner of every check contains three separate numbers in this order: routing number, account number, check number. They are always in the same position on every check from your bank, printed in the same magnetic ink.
The routing number (leftmost) identifies your specific bank or credit union. It is always nine digits. The account number (middle) identifies your account within that bank. The check number (rightmost) identifies that specific check. Your bank assigns a new check number to each check in your book, starting at 1001 or similar.
The account number is the only one of the three that changes if you open a new account at the same bank. Your routing number stays the same as long as you bank there. The check number increments by one with each check you write.
Where else to find your account number if you do not have a check
If you have not ordered checks yet or your checks are packed away, your bank keeps your account number in multiple places you can reach in minutes.
Your bank statement (paper or digital) displays your account number at the top or in the account information section. Your online banking portal shows it in your account settings or dashboard — usually under "Account Details" or "Account Information." Your debit card does not show the account number, but your bank's mobile app often does. You can also call your bank's customer service number on the back of your debit card and ask them to read it to you.
If you bank at a large national bank, you can usually find your account number by logging into your online account within seconds. Credit unions and smaller regional banks may require a phone call, but the wait is typically short.
Why banks print the account number on checks
The account number on your check tells the receiving bank where to deposit the money. When you write a check to someone, they deposit it at their bank. That bank reads the routing number to find your bank, then reads the account number to find your specific account within your bank, then deducts the amount from your balance.
The magnetic ink allows banks to sort and process thousands of checks per hour without human intervention. A machine scans the numbers, verifies the amount matches what is written in words, and routes the check to the correct account. This is why the numbers must be printed in a specific format and position — any deviation can slow processing.
The check number helps you track which check you wrote and when. When you record a check in your register or banking app, you note the check number so you can match it to the transaction later. Banks also use the check number to identify the check if there is ever a dispute about whether it cleared.
What to do if you cannot read the numbers on your check
Faded or smudged numbers on an old check can make the account number hard to read. If the magnetic ink is damaged, banks may have trouble processing the check electronically and may reject it or process it slowly.
If you need to reference your account number and your check is illegible, do not guess or try to reconstruct it. Call your bank or log into your online account instead. Providing an incorrect account number to someone — whether on a form, a payment instruction, or a check — can send money to the wrong place and create a mess to untangle.
If you are writing a check and the numbers are too faded to read clearly, order a new book of checks from your bank. Checks are inexpensive and arrive within one to two weeks. Using a check with illegible numbers risks the payment not reaching the intended recipient.
The difference between account number and routing number
People often confuse these two numbers because they appear together on every check. They serve different purposes and are not interchangeable.
Your routing number is the same for every account you hold at your bank. It identifies the bank itself — your bank's location and the Federal Reserve district it belongs to. A large national bank may have multiple routing numbers if it operates branches in different regions, but most customers have only one.
Your account number is unique to each account you own. If you have a checking account and a savings account at the same bank, each one has its own account number. The routing number stays the same for both accounts. This is why the account number is the critical piece of information when you are setting up a direct deposit, a wire transfer, or an automatic payment — it tells the bank which of your accounts to use.
Frequently Asked Questions
Is it safe to share my account number from a check?
Sharing your account number alone is generally safe — your bank needs it to process legitimate payments like direct deposits and bill payments. However, do not share your account number with someone you do not trust or on an unsecured website. Scammers can use an account number to attempt unauthorized withdrawals, though banks have fraud protections in place. Never share your account number along with your routing number and PIN to anyone.
Can someone withdraw money if they have my account number?
An account number alone is not enough to withdraw money. A person would also need your routing number, and even then most banks require additional verification like a PIN, password, or signature. If you suspect someone has misused your account number, contact your bank immediately. Banks can freeze accounts and reverse unauthorized transactions.
What if the account number on my check does not match my bank statement?
This should not happen — your bank prints the same account number on every check in your book. If you see a mismatch, contact your bank right away. It could indicate a printing error, a compromised check, or a problem with your account. Your bank can reissue checks or investigate the discrepancy.
Do I need my account number to deposit a check into my own account?
No. When you deposit a check at an ATM or through your bank's mobile app, you only need to photograph or scan the front and back of the check. The bank reads the routing and account numbers from the check itself. You do not need to type them in.
Can I use the account number from an old check after I close the account?
No. Once you close an account, that account number is deactivated and cannot receive deposits or payments. If you write a check from a closed account, it will bounce. If someone tries to deposit money using that account number, it will be rejected. Always use checks from your current, active account.