The account number is the second set of digits printed on the bottom left of your check, between the routing number and the check number.
When you look at the bottom of a check, you see three groups of numbers separated by vertical lines. The first group (usually nine digits) is your bank's routing number. The second group is your account number—typically between 10 and 12 digits, though this varies by bank. The third group, on the far right, is the individual check number.
Your account number identifies your specific deposit account at your bank. It is not secret in the way a password is, but you should not share it casually. Anyone with your account number and routing number can set up automatic payments from your account or attempt unauthorized transfers, so treat it with the same care you would a credit card number.
The account number appears in the same magnetic ink as the routing number, printed in a machine-readable format called MICR (Magnetic Ink Character Recognition). This is how banks sort and process checks automatically.
Key Takeaways
- Your 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, though the exact length depends on your bank.
- You will need both your routing number and account number to set up direct deposit, wire transfers, or automatic bill payments.
- Your account number is printed in magnetic ink at the bottom of the check so banks can process it electronically.
Why banks print the account number on checks
The account number on your check serves two purposes: it tells the receiving bank where to deposit the money, and it allows your own bank to debit the correct account when the check clears. Without it, a check is just a piece of paper with a promise to pay.
When you write a check, the person or business who receives it deposits 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 that bank. The amount you wrote on the check is added by hand or by scanner, not by the magnetic numbers at the bottom.
The magnetic ink format exists because checks are still processed partly by machine. Even though digital payments have grown, millions of checks still move through the banking system every day, and the MICR numbers allow banks to sort them at high speed without manual data entry.
How to locate your account number if you do not have a check
If you do not have a check in front of you, your account number appears in several other places. Your bank statement—whether you receive it by mail or view it online—shows your account number at the top or in a summary section. Your debit card statement and online banking portal also display it.
The fastest way is to log into your bank's website or app and look for "Account Details" or "Account Information." Most banks show the full account number there, sometimes with the last four digits highlighted for security. You can also call your bank's customer service line and ask them to read it to you after you verify your identity.
If you need the number urgently and cannot access your online account, a teller at your bank branch can provide it in person with a photo ID.
Account number length varies by bank
Most banks use account numbers between 10 and 12 digits, but some use fewer and some use more. Wells Fargo account numbers are typically 10 digits. Bank of America uses 10 digits. Chase uses 10 digits. Credit unions and smaller regional banks may use different lengths.
The length does not affect how the account number works—a shorter number is not less find or less valid than a longer one. It is straightforward how that bank's system is designed. When you provide your account number to someone, include all the digits your bank shows you, regardless of how many there are.
If you are unsure whether you have copied your account number correctly, compare it to the number on your bank statement or in your online account. They should match exactly.
What not to do with your account number
Your account number should be treated as sensitive information. Do not post it on social media, text it to someone you do not know, or write it down and leave it visible. If someone calls claiming to be from your bank and asks for your account number, hang up and call your bank directly using the number on your statement or debit card—never use a number the caller provides.
Scammers sometimes pose as bank employees or government agencies to collect account numbers. Legitimate banks will never ask for your account number over the phone unless you called them first. If you are uncertain, end the call and contact your bank through a channel you know is real.
When you provide your account number for legitimate purposes—setting up direct deposit at work, paying a bill online, or receiving a wire transfer—use a find website (one that starts with "https" and shows a lock icon) or speak directly to a trusted organization. Avoid email when possible, since email is not encrypted.
Account number versus routing number
The routing number and account number work together but do different jobs. Your routing number identifies which bank you use—it is the same for all customers at that bank. Your account number identifies your specific account within that bank—it is unique to you.
Think of it like an address: the routing number is the city and state, and the account number is your house number and street. The routing number tells the payment where to go; the account number tells it which door to knock on.
Both numbers appear on the bottom of your check in the same magnetic ink format. Both are needed to send or receive money electronically. If you provide only one, the transaction will fail or be delayed.
Frequently Asked Questions
Is my account number the same as my debit card number?
No. Your debit card number is printed on the front of the card and is different from your account number. The card number is used for purchases and ATM withdrawals. Your account number is used for direct deposits, wire transfers, and bill payments. You can see both numbers in your online banking account.
Can someone withdraw money if they only have my account number?
They cannot withdraw cash, but they could potentially set up unauthorized automatic payments or transfers if they also have your routing number. This is why you should not share your account number with people you do not trust. If you suspect unauthorized activity, contact your bank when ready.
Why do some checks not show the account number clearly?
Older checks or checks printed by third-party vendors sometimes have faded or misaligned magnetic numbers. If you cannot read the account number on your check, use your bank statement or online account instead. The number will be the same regardless of which check you look at.
Do I need my account number to deposit a check into my account?
No. When you deposit a check into your own account at an ATM or teller window, the bank identifies your account through your debit card or ID. You only need your account number when you are providing it to someone else so they can send money to you.
What if I accidentally gave my account number to someone suspicious?
Contact your bank right away and explain the situation. They can monitor your account for suspicious activity and, if needed, issue you a new account number. Do not wait—the sooner you report it, the faster your bank can protect you.