The account number is the second set of digits on the bottom left of your check
On the bottom of any check, you will see three groups of numbers separated by vertical lines. The first group is the routing number. The second group — usually 10 to 12 digits long — is your account number. The third group is the check number.
The account number identifies your specific checking account at your bank. When someone deposits a check you wrote, the bank uses the routing number to find your bank and the account number to find your account within that bank. If you need to give someone your account number for direct deposit, bill payments, or wire transfers, this is the number to provide.
The account number appears in the same location on every check from your account, though the exact number of digits can vary by bank. Some banks print it with leading zeros; others do not. Both versions refer to the same account.
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, but the exact length varies by bank.
- You need your account number for direct deposit setup, automatic bill payments, and wire transfers.
- The account number is the same on every check in your checkbook, so you only need to look at one.
How to read the three number groups at the bottom of a check
The bottom left corner of a check contains a series of numbers in a special machine-readable format called MICR (Magnetic Ink Character Recognition). These numbers are printed in a specific order for a reason: they tell the banking system where to send the money.
Reading left to right, you see: routing number (9 digits), then account number (typically 10 to 12 digits), then check number (usually 4 to 6 digits). Some checks also print these numbers in regular type above or to the side of the MICR line for easier reading by humans. If your check has both formats, they show the same numbers — use whichever is clearer to you.
The account number is always in the middle position. If you are unsure which group is which, count the digits: the routing number is always exactly 9 digits.
When you need to provide your account number
You will need your account number in several common situations. If your employer offers direct deposit, you will provide both your routing number and account number so your paycheck goes straight into your account. If you set up automatic bill payments through your bank or through a company's website, you will enter these same two numbers.
Wire transfers also require your account number. If someone is sending you money via wire, they will ask for your routing number and account number. Some banks also ask for your account number when you call customer service, though they may verify it against other information first.
You do not need to provide your account number for basic check deposits or when you are simply writing a check to someone. The person receiving the check can see all three numbers on the bottom, but they typically only use the routing and account numbers if they are depositing the check electronically rather than at a physical branch.
Why the account number is different from the routing number
The routing number identifies your bank — it is the same for all customers of that bank. The account number identifies your specific account within that bank. Think of it this way: the routing number is like the address of a post office, and the account number is like your mailbox number inside that post office.
This separation matters because it allows the banking system to work efficiently. When a check arrives at a processing center, the routing number tells the system which bank to send it to. Once it reaches your bank, the account number tells the bank which account to deposit it into. Without both numbers, the bank would not know where the money should go.
What to do if you cannot find your account number on a check
If your checks are very old or damaged, the numbers at the bottom may be faded or illegible. In that case, you have several options. The fastest is to log into your online banking account — your account number is usually displayed on the dashboard or in the account details section. You can also call your bank's customer service line; they will verify your identity and provide your account number over the phone.
If you have a debit card from the same account, your account number may be printed on the card as well, though not all banks do this. Your bank statement also lists your account number, usually near the top of the page. Any of these sources will give you the correct number.
Account numbers and check security
Your account number is visible to anyone who sees a check you have written, so it is not a secret in the way a password is. However, someone who has only your account number cannot access your account without also having your routing number, and even with both numbers, they can only deposit checks into your account or set up transfers out of it — they cannot withdraw cash or change your account settings.
If you are concerned about security, the main risk is not the account number itself but rather someone using your account number and routing number to set up unauthorized automatic payments or ACH transfers. If this happens, contact your bank immediately. Most banks have fraud protection that can reverse unauthorized transfers within a certain window.
Frequently Asked Questions
Is my account number the same on every check I have?
Yes. Every check from the same account has the same account number printed on it. You only need to look at one check to find your account number — it will not change unless you close the account and open a new one.
Can I use my account number instead of my full routing number and account number?
No. You need both the routing number and the account number for direct deposit, wire transfers, and automatic payments. The routing number tells the system which bank, and the account number tells the system which account within that bank. One without the other is incomplete.
What if the numbers at the bottom of my check are printed in a different order?
The MICR line at the bottom always follows the same order: routing number, account number, check number. If you see numbers printed elsewhere on the check — such as in the top right corner or along the top — those are usually just a duplicate for human readability and will be in the same order.
Do I need to memorize my account number?
No. You can look it up on a check, your bank statement, or your online banking account whenever you need it. Most people keep a note of it in a safe place rather than memorizing it, since you do not use it frequently enough to remember it by heart.