The account number is the second set of digits on the bottom left of your check, printed between the routing number and the check number.

On a standard check, three numbers appear in a row along the bottom left edge, printed in magnetic ink. From left to right, they are: the routing number (nine digits), your account number (typically 10 to 12 digits), and the check number (usually four to five digits). Your account number identifies which specific account at your bank the check draws from. It is unique to that account only — your savings account at the same bank will have a different account number.

The account number is not the same as your card number, your PIN, or your online banking username. It is printed on every check you order from that account, and it stays the same for as long as you hold the account. If you close the account and open a new one, you get a new account number.

Key Takeaways

  • Your account number appears as 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 and are unique to that specific account at your bank.
  • The same account number appears on every check from that account, and you can use it to set up direct deposit or automatic payments without writing a check.
  • You should not share your account number with anyone you do not trust, as it can be used to initiate transfers or payments from your account.

How to read the numbers on the bottom of a check

The bottom of a check contains three distinct groups of numbers, each separated by a vertical line or symbol. These numbers are printed in a special magnetic ink that machines can read automatically, which is why they look slightly different from the printed text elsewhere on the check.

The first group on the left is always nine digits — that is your routing number. The second group, in the middle, is your account number. The third group on the right is the check number, which also appears in the top right corner of the check in regular print. If you are looking at a check and unsure which number is which, start from the left and count: nine digits, then account number, then check number.

Why banks print the account number on checks

The account number on your check serves two purposes. First, it tells the bank's sorting machines which account to debit when the check is deposited. Second, it gives you a reference number you can use when you need to identify your account without writing a check — for instance, when you set up direct deposit at a new job or arrange automatic bill payments.

Banks print the account number in magnetic ink so that check-processing equipment can read it at high speed. When you deposit a check or it clears through the banking system, machines scan these numbers to route the money to the correct account. This is why the numbers must be printed in a specific format and why you should not alter them.

When you need your account number without a check

You do not need a check in front of you to find your account number. You can see it in several other places: your bank statement (usually at the top), your online banking portal (in your account settings or dashboard), your debit card (sometimes printed on the back), or by calling your bank's customer service line. Many banks also display it in their mobile app under account details.

If you have lost all your checks and cannot access online banking, call your bank's main number and ask for your account number. You will need to verify your identity with your Social Security number, date of birth, or other security questions. The bank can provide the number over the phone, and you can write it down for future reference.

What not to do with your account number

Your account number is not a secret like a password, but it is not public information either. You should share it only with people and organizations you trust — your employer (for direct deposit), your utility company (for automatic bill pay), or your bank itself. Do not post it on social media, include it in an email to someone you do not know, or give it to a caller who contacted you first.

If someone has your account number and routing number, they can attempt to initiate an ACH transfer (an electronic transfer between bank accounts) or set up a recurring payment without your permission. This is why you should treat your account number with the same care as your debit card number. If you believe your account number has been compromised, contact your bank when ready and ask them to monitor the account for unauthorized activity.

Account numbers across different banks

Account numbers vary in length depending on your bank. Most are 10 to 12 digits, but some banks use shorter or longer numbers. A bank in one state may use a different format than a bank in another state. The important thing is that your bank's system recognizes your account number and uses it to identify your account.

If you have accounts at multiple banks, each account will have its own unique account number. You cannot use your account number from one bank at another bank — the routing number and account number work together as a pair, and they are specific to that bank and that account. If you switch banks, your new account will have a new account number, and you will need to update any automatic payments or direct deposits that were tied to your old account number.

Frequently Asked Questions

Is my account number the same as my routing number?

No. Your routing number identifies which bank you use (nine digits), while your account number identifies which specific account at that bank (typically 10 to 12 digits). Both appear on your check, but they serve different purposes. You need both numbers to set up direct deposit or automatic payments.

Can someone withdraw money if they have my account number?

They cannot withdraw cash directly, but they can attempt to initiate an electronic transfer or recurring payment. If you believe your account number has been misused, contact your bank right away. Banks have fraud protections and can reverse unauthorized transfers in many cases, especially if you report them quickly.

What if I cannot find the account number on my check?

Check the bottom left corner of the check where the magnetic numbers are printed. If the numbers are faded or unclear, log into your online banking account or call your bank. Your account number also appears on your monthly statement and in your bank's mobile app.

Do I need to memorize my account number?

You do not need to memorize it, but it is useful to write it down and keep it in a safe place. You will need it when you set up direct deposit, arrange bill payments, or contact your bank about your account. Keeping a record separate from your checkbook is safer than relying on checks alone.