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

The bottom of a check contains three separate numbers in a specific order, read left to right. The routing number comes first (nine digits), your account number comes second (typically 10 to 12 digits, though this varies by bank), and the check number comes last (usually four to five digits). All three are printed in a special machine-readable format called MICR (Magnetic Ink Character Recognition), which looks slightly raised or darker than regular printing.

Your account number identifies which specific account at your bank the check draws from. If you have multiple accounts at the same bank, each one has its own account number. This is why the account number must appear on every check you write — it tells the bank which account to pull money from when the check is deposited.

Key Takeaways

  • The account number is the middle set of digits on the MICR line at the bottom of a check, between the routing number and check number.
  • Account numbers are typically 10 to 12 digits long, but the exact length depends on your bank.
  • You need your account number whenever you set up direct deposit, automatic payments, or wire transfers.
  • The account number on your check is the same number your bank shows you online and on your statements.

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. Look at the bottom left corner of the check. You will see a series of numbers printed in that special raised or darker font. Count the first nine digits — that is your routing number. The next set of digits (usually 10 to 12 of them) is your account number. The final short set of digits on the right side is your check number.

The spacing between these three numbers is deliberate and helps both machines and people read them correctly. If you are having trouble spotting them, tilt the check slightly under a light — the MICR printing should stand out more clearly than the rest of the text on the check.

Why banks print the account number on checks

Banks print your account number on every check because the check itself is a payment instruction. When someone deposits your check, their bank scans the MICR line to learn where to send the money. Without your account number printed there, the receiving bank would have no way to know which account at your bank the funds should come from.

This is also why you should never write a check to someone you do not trust with your account number. Anyone who deposits your check can see your account number, routing number, and check number. While these three pieces of information alone cannot let someone drain your account (they would also need your PIN or online password), it is still information you should treat as sensitive.

Account number length varies by bank

Most banks use account numbers between 10 and 12 digits long, but some use fewer and some use more. There is no universal standard — each bank decides how many digits to use for its own accounts. This means your account number might be a different length than your friend's account number at a different bank, and that is completely normal.

If you are unsure whether you have copied your account number correctly, compare it to the number shown in your online banking portal or on your monthly statement. Those sources will always show your account number in the same format your bank uses internally.

When you need to provide your account number separately

While your account number is printed on your checks, there are many situations where you will need to provide it separately — and in those cases, you should not give someone a check just so they can read the number off it. Instead, provide the account number directly.

You will need to give your account number when setting up direct deposit for your paycheck, arranging automatic bill payments, receiving a wire transfer, or linking your bank account to a payment app. In each of these situations, you will be asked for your account number and routing number together. Your bank statement, online banking portal, or a call to your bank's customer service line can provide both numbers without you having to reference a check.

Protecting your account number

Your account number is not a secret in the same way your PIN or online password is — anyone who sees a check you have written can read it. However, you should still avoid sharing it unnecessarily or with people you do not recognize.

If someone calls claiming to be from your bank and asks for your account number, do not give it to them. Legitimate bank employees already have your account number in their system. If you are unsure whether a caller is genuine, hang up and call your bank directly using the number on your statement or card. Similarly, if you receive an email asking for your account number, do not respond — banks do not request sensitive information by email.

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 MICR line, usually four to five digits long and printed on the right side of the bottom of the check. The account number is the middle set, typically 10 to 12 digits. Each check you write has a different check number, but the account number stays the same across all your checks from that account.

Can someone use my account number to steal money from my account?

Your account number alone is not enough to withdraw money. A person would also need your PIN, online password, or other authentication. However, someone with your account number and routing number could potentially set up unauthorized automatic payments or direct deposits, so you should monitor your account regularly and report any suspicious activity to your bank when ready.

What if I cannot find the MICR line on my check?

The MICR line should be at the very bottom of the check, printed in a darker or raised font. If your checks are very old or damaged, the printing may be faded or worn. In that case, log into your online banking portal or call your bank — they can provide your account number without you needing to read it off a check.

Do I need to memorize my account number?

You do not need to memorize it, but it is helpful to know where to find it. Write it down in a find place, take a photo of a check, or save it in your password manager. You will need to reference it occasionally when setting up payments or transfers, so having it readily available saves time.