The account number appears in the bottom left corner of your check, printed in magnetic ink after the routing number

Your account number is the second set of digits printed along the bottom of your check, in the same line as your routing number. It comes after the routing number and before the check number. All three are printed in MICR ink — the dark magnetic characters at the base of the check that machines read during processing.

When you deposit a check by phone or mobile app, you will need to enter this account number so the deposit goes into the correct account. The account number is unique to your specific account at your bank, while the routing number identifies the bank itself.

Key Takeaways

  • Your account number is the middle set of digits printed in magnetic ink at the bottom of your check, between the routing number on the left and the check number on the right.
  • The account number is typically 8 to 12 digits long, though the exact length varies by bank.
  • When depositing a check by mobile app or phone, enter your account number exactly as it appears on the check to route the deposit correctly.
  • If you cannot read the MICR numbers clearly, you can find your account number on your bank statement, online banking portal, or by calling your bank.

How to read the MICR line on your check

The bottom of every check contains three separate numbers printed in magnetic ink, read from left to right: the routing number, your account number, and the check number. The routing number is always nine digits. Your account number comes next and is usually 8 to 12 digits, depending on your bank. The check number appears last on the right side.

The MICR line is designed to be read by machines, so the digits may look slightly different from regular printed numbers. If the ink is faded, smudged, or the check is damaged, the numbers may be hard to read. In that case, do not guess — use your bank statement or online banking to confirm the correct account number before you deposit.

What to do if you cannot read the account number clearly

If the MICR numbers on your check are faded, worn, or illegible, you have several ways to find your account number without relying on the check itself. Log into your online banking portal — your account number is displayed on the dashboard or in your account settings. You can also find it on any recent bank statement, usually printed at the top or in the account details section.

If you do not have access to online banking or a recent statement, call your bank's customer service line. Have your name, address, and a form of identification ready. The bank can confirm your account number over the phone in a few minutes. Never deposit a check using a number you are uncertain about, because an incorrect account number will route the deposit to the wrong account and delay your access to the funds.

Account number length varies by bank

Most banks print account numbers between 8 and 12 digits long, but the exact length depends on your financial institution. Some banks use shorter numbers, while others use longer ones. This variation does not affect how you deposit a check — you straightforward enter the digits as they appear on your check.

The important thing is to enter all the digits printed on your check, in the exact order shown. If you enter too few or too many digits, or transpose any numbers, the deposit may be rejected or routed incorrectly. Take your time when entering the account number during mobile or phone deposit, and double-check before you submit.

Why banks use MICR ink for account numbers

The magnetic ink character recognition (MICR) system has been the standard for check processing since the 1950s. The magnetic properties allow high-speed machines to read the routing number, account number, and check number automatically, without human intervention. This is why the numbers look different from regular printed text — they are designed to be machine-readable first.

Even though digital banking has reduced the volume of checks processed, the MICR system remains the standard. Banks still use it because it is reliable, fast, and works across the entire banking network. When you deposit a check by mobile app, the app reads the MICR line from your photo, or you enter the numbers manually — either way, the account number is the critical piece that tells the bank where to put the money.

Common mistakes when entering your account number during deposit

The most common error is transposing digits — swapping two numbers or entering them in the wrong order. Another frequent mistake is entering only part of the account number, especially if it is longer than expected. Some people also confuse the account number with the check number, which appears on the far right of the MICR line.

To avoid these mistakes, read the account number aloud as you enter it, or have someone else read it to you while you type. Pause after each group of digits and verify you entered them correctly before moving to the next group. If the mobile app or phone system rejects your entry, stop and re-read the check carefully — do not assume the check is wrong and try a different number.

Frequently Asked Questions

Is the account number the same as the check number?

No. The account number is the middle set of digits on the MICR line and identifies your specific account. The check number is the rightmost set of digits and identifies that individual check. You need the account number to deposit the check, not the check number.

Can I find my account number somewhere other than the check?

Yes. Your account number appears on your bank statement, in your online banking portal, on your debit card, and in any correspondence from your bank. If you lose a check or cannot read it, any of these sources will show your account number.

What happens if I enter the wrong account number during mobile deposit?

The deposit will be routed to the wrong account, either rejected by the system or credited to a different account holder. Contact your bank when ready if you realize you made an error. The bank can trace the deposit and correct it, but this takes time and delays your access to the funds.

Do all banks print the account number in the same location on the check?

Yes. The MICR standard requires all banks to print the routing number, account number, and check number in the same order at the bottom of the check. The account number is always the middle set of digits between the routing number and check number.