Your account number is printed at the bottom left of your check, after the routing number and before the check number

The bottom of a check contains three sets of numbers in a specific order from left to right: the routing number (nine digits), your account number (typically 10 to 12 digits), and the check number (usually three to four digits). Your account number identifies which specific account at your bank the check is drawn from. It appears in two places on most checks — once in the magnetic ink character recognition (MICR) line at the bottom, and once printed in regular ink in the upper right corner.

The MICR line uses a special font designed to be read by both machines and humans. The numbers are printed in dark ink, usually black or dark blue, and are slightly larger than regular printed text. This is the official version that banks use when processing checks, so if you need to provide your account number for any reason, the MICR line is the authoritative source.

Key Takeaways

  • Your account number sits between the routing number and check number on the MICR line at the bottom of your check.
  • The account number typically contains 10 to 12 digits and identifies your specific bank account.
  • Most checks print the account number twice — once in the MICR line at the bottom and once in the upper right corner in regular text.
  • The MICR line version is what banks use for processing, so use that number when you need to provide it to another party.

How to read the MICR line correctly

The MICR line at the bottom of your check always follows the same pattern: routing number, account number, check number. Start from the left side. The first nine digits are your bank's routing number. Immediately after those nine digits, the next set of numbers (usually 10 to 12 digits) is your account number. At the far right of the MICR line, you'll see a shorter number — typically three or four digits — which is your individual check number.

Some checks include a colon or space between these number groups to make them easier to read, but not all do. If your check doesn't have clear separators, count carefully: nine digits for routing, then your account number begins. The account number will be noticeably longer than the check number that follows it.

Why account numbers vary in length

Different banks use different account number lengths. Some banks use 10-digit account numbers, others use 11 or 12 digits. This variation depends on how the bank's internal systems are structured and how many accounts they need to manage. A 10-digit account number can theoretically support up to 10 billion unique accounts, so most banks don't need longer numbers.

The length of your account number doesn't affect how it works or how banks process checks. Whether your account number is 10 digits or 12 digits, the routing number and account number together uniquely identify your account in the banking system. If you're unsure how many digits your account number should be, check your bank's website or call their customer service line — they can confirm the correct length for your specific account.

The account number in the upper right corner

Most checks print your account number a second time in the upper right area of the check, usually in regular printed text rather than MICR font. This is for human reference — it makes it easier for you to read your account number without having to decode the MICR line. However, this printed version is not used by banks during check processing. Banks rely entirely on the MICR line at the bottom.

If the two versions of your account number don't match, the MICR line version is the correct one. This situation is rare but can happen if a check was misprinted. If you notice a discrepancy, contact your bank before using those checks.

What to do if you can't find your account number on a check

If your checks are very old or damaged, the MICR line may be difficult to read. You can also find your account number on your bank statement, on your bank's website after you log in, or by calling your bank's customer service number. Your debit card may also display your account number, though some banks print only the last four digits on the card for security reasons.

If you've ordered new checks and they haven't arrived yet, log into your online banking account — most banks display your full account number in the account details section. This is the fastest way to get the information without waiting for physical checks to arrive.

Security considerations when sharing your account number

Your account number is not secret information in the way your PIN or password is. It's printed on every check you write, which means anyone who receives a check from you will see your account number. However, you should still be cautious about sharing it unnecessarily.

Never provide your account number to someone who calls you unsolicited, even if they claim to be from your bank. Legitimate banks will never ask you to confirm your account number over the phone — they already have it in their system. If you need to provide your account number to set up a direct deposit or automatic payment, do so only through official channels: your employer's payroll system, your bank's website, or a company's official website that you initiated contact with.

Frequently Asked Questions

Is the account number on my check the same as my routing number?

No. Your routing number identifies your bank (nine digits), while your account number identifies your specific account at that bank (usually 10 to 12 digits). Both appear on your check, but they serve different purposes. Together, they tell the banking system exactly where to send or pull money.

Can I use the account number from my check for direct deposit?

Yes. When you set up direct deposit with your employer or another organization, you'll need both your routing number and your account number from your check. These two pieces of information are all that's needed to route money directly into your account.

What if my check doesn't have a MICR line?

All legitimate checks have a MICR line at the bottom. If a check doesn't have one, it may be a photocopy, a damaged original, or a non-standard check. Contact your bank if you're unsure whether a check is valid.

Does my account number change if I get new checks?

No. Your account number stays the same for the life of your account, even if you order new checks multiple times. The account number printed on new checks will be identical to the one on your old checks.

Can someone withdraw money from my account if they have my account number?

Not without additional information. Your account number alone is not enough to withdraw money. A person would also need your routing number, and even then, most banks require additional verification before processing transfers. Your PIN, password, and debit card are what actually protect access to your account.