A bank account number is a string of 8 to 12 digits unique to your account
Your bank account number is the identifier your bank uses to distinguish your account from every other account at that institution. It appears on checks, statements, and online banking portals. The number itself is always digits only — no letters, no hyphens, no spaces in the actual number, though banks may display it with spaces or dashes for readability.
Account numbers vary in length by bank. Most are between 8 and 12 digits long, but some banks use fewer and some use more. The number is not standardized across the banking system the way a routing number is, so your account number at Chase looks nothing like your account number at Bank of America, and both are different lengths.
You need your account number when you set up direct deposit, arrange wire transfers, authorize automatic bill payments, or provide banking details to an employer or government agency. It is not secret in the way a PIN or password is — you routinely give it to payroll departments and utility companies — but it should not be shared casually with people you do not know.
Key Takeaways
- A bank account number is 8 to 12 digits (sometimes longer) and appears on the bottom left of your checks, on your monthly statement, and in your online banking portal.
- The number is unique to your account at that specific bank, so the same account number cannot exist at two different banks.
- Account numbers contain only digits and no letters or special characters, though banks may display them with spaces for readability.
- You will need your account number to set up direct deposit, authorize bill payments, and receive wire transfers or refunds.
Where to find your account number on a check
If you have checks, the account number is printed on the bottom of every check in the second group of numbers from the left. The bottom of a check shows three separate number sequences: the routing number on the far left (nine digits), your account number in the middle (usually 8 to 12 digits), and the check number on the right.
The account number on a check is printed in the same magnetic ink as the routing number, which is why both are easy to read even on old or worn checks. If your checks are several years old, the account number printed on them is still valid — banks do not change account numbers unless you close and reopen the account.
Where to find your account number on your bank statement
Your monthly bank statement lists your account number near the top, usually in the header section alongside your name and the statement date. On paper statements, it appears in the upper right or upper left corner. On online statements, it is typically displayed in the account summary section or in a box labeled "Account Information."
If you receive a statement by email, the account number is usually visible in the PDF or in the email itself. Some banks hide part of the account number for security when displaying it on-screen (showing only the last four digits as ••••5678), but the full number is always available if you click to view details or download the full statement.
Where to find your account number in online banking
Log into your bank's website or mobile app and look for an "Account Summary," "Account Details," or "My Accounts" section. Your account number is displayed there alongside your account type (checking, savings, money market) and your current balance. Most banks show the full account number in this view, though some mask it by default and require you to click "Show" or "Reveal" to see all digits.
If you cannot find it in the summary view, look for a "Statements" or "Documents" section and download your most recent statement — the account number is always printed there. You can also call your bank's customer service line and provide your name and Social Security number; they will read your account number to you over the phone.
How account numbers differ from routing numbers
Your routing number identifies the bank or credit union itself — all customers at the same branch or institution share the same routing number. Your account number identifies only your account within that bank. Together, they form a complete address: the routing number says "this is Chase," and the account number says "this is John's checking account at Chase."
When you set up direct deposit or a wire transfer, you provide both numbers. The routing number tells the sending bank where to send the money, and the account number tells that bank which account to deposit it into. If you give the correct routing number but the wrong account number, the money goes to the wrong person's account at the correct bank.
What account numbers look like across different banks
Chase account numbers are typically 10 digits. Bank of America uses 10 digits. Wells Fargo uses 10 digits. Citibank uses 10 digits. However, some smaller banks and credit unions use 8 digits, and some use 12 or more. There is no universal standard — each bank decides its own length.
The account number itself contains no pattern that reveals information about you. It is not based on your Social Security number, your birth date, or your branch location. It is simply a unique identifier assigned to your account when you open it. Two people at the same bank with accounts opened on the same day will have completely different account numbers.
What to do if you cannot find your account number
Call your bank's customer service number (on the back of your debit card or on your statement) and provide your name and Social Security number. A representative will read your account number to you. This takes less than a minute and requires no appointment.
If you are setting up direct deposit for an employer and do not have a check or statement handy, ask your bank for a "direct deposit authorization form" or "voided check." Many banks will email or print a form that includes your routing and account numbers in the correct format for payroll departments. Some banks also allow you to screenshot your account number from the online banking app and send it to your employer.
Frequently Asked Questions
Is my account number the same as my debit card number?
No. Your debit card number is a 16-digit number printed on the front of your card. Your account number is a separate number (usually 8 to 12 digits) that your bank uses internally. They are linked to the same account, but they are different numbers. You need the account number for direct deposit and wire transfers, not the debit card number.
Can someone steal money from my account if they know my account number?
Not without your routing number as well. A thief with only your account number cannot access your account or move money. However, with both your account number and routing number, someone could potentially set up an unauthorized automatic payment or wire transfer. This is why you should not share both numbers together with people you do not trust, though you routinely give them to employers and government agencies.
Does my account number change if I move to a different branch?
No. Your account number stays the same even if you transfer to a different branch of the same bank, move to a different state, or change your account type. The only time your account number changes is if you close the account and open a new one.
What if I see different account numbers on my checks and my statement?
This is unusual and suggests either an error or that you have multiple accounts at the same bank. Compare the routing numbers on both — if they match, you are looking at the same account and the numbers should be identical. If they differ, you have two separate accounts. Call your bank to confirm which account is which.
Do I need my account number to check my balance?
No. You can check your balance by logging into online banking with your username and password, calling your bank's automated phone line, or visiting an ATM with your debit card. You only need your account number when you are providing it to someone else — an employer, a government agency, or another bank.