Your checking account number is printed on the bottom left of every check you write, right after the routing number
The bottom of a check contains three separate numbers, printed in magnetic ink. From left to right, you see the routing number (nine digits), then your account number (usually 10 to 12 digits), then the check number (three to four digits). Your account number is the middle set of digits. It identifies which specific account at your bank the check is drawn from.
The account number stays the same across all your checks from that account. If you write 50 checks this year, all 50 will have the same account number printed on them. When someone deposits a check you wrote, the bank uses your routing number and account number together to pull the money from your account.
You do not need to memorize it. You can look it up on any check in your checkbook, or find it online through your bank's website or mobile app. Most banks also print it on your monthly statement and on your debit card.
Key Takeaways
- Your account number is the middle set of digits on the bottom of a check, between the routing number on the left and the check number on the right.
- The account number is typically 10 to 12 digits long and remains the same on every check from that account.
- You can also find your account number on your bank statement, through your online banking portal, or by calling your bank.
- Banks use your routing number and account number together to process payments and deposits, so both numbers must be correct for a transaction to reach the right account.
How the three numbers work together
The routing number tells the banking system which bank holds the account. The account number tells that bank which specific account to use. The check number is just for your own record-keeping—it helps you track which check you wrote and when.
When you write a check to pay a bill, the person or business receiving it deposits it at their bank. Their bank reads the routing number first to find your bank, then reads the account number to find your specific account within that bank. Without both numbers correct, the deposit cannot be processed.
This is why it matters if you accidentally write down your account number wrong when setting up a bill payment or direct deposit. The transaction will fail or go to the wrong account. If you are ever unsure whether you have copied the number correctly, check a physical check or log into your bank account online to verify.
Finding your account number without a check
If you do not have a checkbook handy, your bank provides your account number in several other places. Log into your online banking portal—most banks display your account number prominently on the dashboard or in an account details section. Your mobile banking app usually shows it as well.
Your monthly bank statement lists your account number at the top or in the account information section. If you have a debit card linked to the account, the account number may be printed on the card itself, though some banks omit it for security reasons.
You can also call your bank's customer service line and provide your name and Social Security number to verify your account number over the phone. Have a pen ready to write it down.
Why banks print account numbers on checks
Printing the account number on every check makes the payment system faster and more reliable. When checks were the primary way people paid bills, postal workers and bank employees had to read thousands of checks by hand each day. The magnetic ink and standardized placement let machines read the numbers automatically, which sped up processing dramatically.
Today, most checks are scanned and processed electronically within 24 hours. The printed numbers are still there because the system works and because some people and businesses still write checks regularly. Removing them would require rebuilding the entire check-processing infrastructure.
Protecting your account number
Your account number is not a secret in the same way a password is. It appears on every check you write, and anyone who receives a check from you can see it. However, you should still be cautious about sharing it unnecessarily.
Do not give your account number to someone unless you trust them and know why they need it. Legitimate businesses—your employer, your utility company, your insurance provider—will ask for it when they need to set up direct deposit or automatic payments. Scammers sometimes call or email claiming to be from your bank and ask for your account number; your actual bank already has this information and will never ask for it unsolicited.
If you lose a checkbook or suspect someone has written unauthorized checks from your account, contact your bank immediately. They can cancel the remaining checks and issue you a new checkbook with a new account number if necessary.
What happens if you give someone the wrong account number
If you accidentally provide an incorrect account number when setting up a payment or deposit, the transaction will usually fail. The receiving bank will try to match the account number to an account at your bank and will not find a match. The payment bounces back, and you receive a notification that the transaction could not be completed.
In rare cases, the account number might match a different account at your bank—perhaps an old account you closed, or someone else's account if you transposed a digit. The bank's error-checking systems are designed to catch these mistakes, but if one slips through, the receiving bank will eventually notice the discrepancy and return the funds. Contact your bank and the recipient to correct the account number and resubmit the payment.
Frequently Asked Questions
Is my account number the same as my routing number?
No. Your routing number identifies your bank; your account number identifies your specific account within that bank. Both appear on the bottom of your check. The routing number comes first (nine digits), and the account number comes second (usually 10 to 12 digits).
Can someone use my account number to steal money from my account?
Your account number alone is not enough to withdraw money. A thief would also need your PIN, online banking password, or physical access to your debit card. However, do not share your account number with people you do not trust. If you suspect fraud, contact your bank immediately.
Do all checks from the same bank have the same routing number?
Not always. Large banks may have multiple routing numbers depending on which branch holds your account or which processing center handles your region. Check the bottom of your check to see your specific routing number rather than assuming all checks from your bank are the same.
What if I cannot find the numbers on my check because the ink is faded?
Log into your online banking account or call your bank. They can provide both your routing number and account number. You can also order a new checkbook, which will have clearly printed numbers.
Do I need my account number to set up direct deposit at a new job?
Yes. Your employer will ask for your routing number and account number to deposit your paycheck directly into your account. You can find both on a check or through your bank's website.