Your account number is the second set of digits on the bottom left of the check

The bottom of a check contains three separate numbers printed in magnetic ink, read left to right. The first number is your bank's routing number. The second number — usually 10 to 12 digits long — is your account number. The third is the check number itself. Your account number identifies which specific account at your bank the check is drawn from.

The account number appears in the same magnetic ink as the routing number because both are machine-readable. When you deposit a check or pay a bill by check, the bank's processing equipment reads these numbers to route the payment to the correct account. You can also find your account number printed in regular type at the top right corner of the check, though this version is for human reference only.

If you cannot read the numbers clearly — they are faint, smudged, or the check is old — your bank statement or online banking portal will show your full account number. You can also call your bank's customer service line and provide your name and routing number; they will confirm your account number without requiring you to read it from the check.

Key Takeaways

  • Your account number is the middle set of digits printed in magnetic ink at the bottom of the check, between the routing number and the check number.
  • Account numbers are typically 10 to 12 digits long and identify your specific account within the bank.
  • The same account number also appears in regular print at the top right of the check for your reference.
  • If the printed numbers are unclear, your bank statement or online banking portal shows your account number without guessing.

How the three bottom numbers work together

The magnetic ink line at the bottom of a check is called the MICR line (Magnetic Ink Character Recognition). Reading left to right, it contains the routing number, account number, and check number in that order. Each serves a different purpose in the payment process.

The routing number tells the Federal Reserve and the receiving bank which bank issued the check. The account number tells that bank which account within its system should be debited. The check number is a sequential identifier for that individual check, used for record-keeping and to prevent duplicate processing. Together, these three numbers may support the payment reaches the correct account and is recorded correctly on both sides of the transaction.

Why you need to know which number is which

If you are setting up direct deposit, paying a bill by check, or sending money via bank transfer, you will often be asked for your account number separately from your routing number. Providing the wrong number — for example, giving your check number instead of your account number — will cause the transaction to fail or route to the wrong place.

Some online bill-pay systems ask for both numbers; others ask for only the account number if you have already entered your bank's name. When in doubt, provide both the routing number and the account number. The routing number identifies the bank; the account number identifies you within that bank.

Account number length varies by bank

Most account numbers are 10 to 12 digits, but the exact length depends on your bank. Some banks use 9 digits; others use 13 or 14. The length does not affect how the number works — it is straightforward how that particular bank structures its account identification system.

If a form asks for your account number and specifies a certain number of digits, count the digits on your check before entering them. If your account number is shorter than the form expects, do not pad it with zeros. Contact your bank or the organization requesting the number and ask whether they need a different format or identifier.

Where else your account number appears

Your account number is printed on every check in your checkbook, always in the same position. It also appears on your monthly bank statement, usually near the top or in a summary section. If you use online banking, your account number is visible in your account settings or profile page, often labeled as "Account Number" or "DDA Number" (Demand Deposit Account).

You can also find your account number on deposit slips, wire transfer forms, and any official correspondence from your bank about your account. If you have multiple accounts at the same bank — a checking account and a savings account, for example — each has its own account number, and each will have its own checks or deposit slips.

What to do if you cannot locate the number

If you do not have a check handy or your checks are too old to read clearly, log into your online banking portal. Your account number is almost always visible on the dashboard or in an account details section. If you do not use online banking, call your bank's main customer service number, provide your name and date of birth, and ask them to read your account number to you.

Do not share your account number with anyone unless you initiated the contact and trust the recipient. Scammers sometimes call or email claiming to be from your bank and ask for account numbers as part of a fake verification process. Your bank already knows your account number; they will never ask you to confirm it unsolicited.

Frequently Asked Questions

Is the account number the same as the check number?

No. The check number is the third set of digits on the bottom line, usually a smaller number like 1001 or 2847. Your account number is the middle set and is much longer, typically 10 to 12 digits. The check number identifies that individual check; the account number identifies your account.

Can I use the account number from an old check?

Yes. Your account number does not change unless you close the account and open a new one. An old check from years ago will have the same account number as a new check from the same account. If the numbers are hard to read, use a newer check or contact your bank.

What if the magnetic ink numbers are missing or damaged?

Contact your bank and request a replacement checkbook. Checks with missing or unreadable MICR numbers cannot be processed by automated equipment and will cause delays or rejection. Your bank can reissue checks at no cost if the printing is defective.

Do I need both the routing number and account number for every transaction?

Not always. For direct deposit, you need both. For bill pay through your bank's website, you usually need only the account number because the bank already knows its own routing number. For wire transfers, you typically need both. When in doubt, provide both numbers.