Your account number is the second set of numbers on the bottom left of your check, between the routing number and the check number

The bottom of a check contains three separate number sequences, and they appear in a specific order from 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 digits). All three are printed in MICR font — the distinctive characters designed to be read by both machines and humans.

The account number identifies which specific account at your bank the check is drawn from. If you have multiple accounts at the same bank, each one has its own account number. This is why two checks from the same person might have different account numbers — one might be from their checking account and another from their savings account.

You can also find your account number on your bank statement, your debit card, online banking, or by calling your bank. But the check itself is the fastest place to look if you have one in front of you right now.

Key Takeaways

  • Your account number sits between the routing number and check number on the bottom of your check, printed in MICR font.
  • Account numbers are typically 10 to 12 digits long, but the exact length depends on your bank.
  • The same bank can issue different account numbers for different accounts you hold, so verify you are using the correct one for the account you intend.
  • If you cannot locate your account number on a check, your bank statement or online banking portal will display it.

How the three numbers are arranged on the check

The MICR line at the bottom of a check always follows the same left-to-right order. The routing number appears first, when ready after a colon symbol. It is always nine digits. Next comes your account number, which your bank assigns. Then comes the check number, which is the number printed in the upper right corner of the check as well.

Some checks also print the account number in plain text elsewhere on the check — often in the upper right corner near the check number — but the MICR line is the official location. If you are filling out a form that asks for your account number, use the one from the MICR line to be certain.

The spacing between these three numbers is consistent across all checks, which is why machines can read them reliably. A human reader scanning from left to right will see: routing number, then account number, then check number.

Why account number length varies between banks

Different banks use different account numbering systems. Some banks assign 10-digit account numbers, others use 11 or 12 digits. A few use fewer. The length does not indicate anything about the account type or the bank's size — it is straightforward how that particular bank structures its internal numbering.

This matters because if you are copying your account number from a check, you need to copy all of the digits, not assume a standard length. Omitting a digit will cause the payment to fail or be routed to the wrong account. When in doubt, count the digits on your check and write them all down.

Your bank's website or customer service line can confirm the correct length for your account number if you are unsure whether you have copied it correctly.

Distinguishing your account number from the check number

The check number and account number are straightforward to confuse because both appear on the check in multiple places. The check number is typically a four-digit sequence and appears in the upper right corner of the check in large print. It also appears in the MICR line at the bottom, after your account number.

Your account number is much longer — usually 10 to 12 digits — and appears only in the MICR line and sometimes in smaller print elsewhere on the check. If you are unsure which is which, count the digits. Four digits is the check number. Ten or more digits is your account number.

The check number is used to track individual checks you write. The account number identifies the account itself. When you set up automatic payments or provide banking information to a third party, you are providing your account number, not your check number.

What to do if your check does not have a readable MICR line

Older checks, checks that have been damaged, or checks with faded printing may have an illegible MICR line. If you cannot read the numbers clearly, do not guess — an incorrect account number will cause serious problems with any payment or transfer.

Instead, contact your bank directly. You can call the customer service number on the back of your debit card, log into your online banking account, or visit a branch in person. Your bank can confirm your account number in seconds and can also issue you a new checkbook if your current checks are too worn to read.

Some banks also print your account number on your monthly statement, so if you have a recent statement available, you can verify the number there before contacting the bank.

Using your account number safely

Your account number, combined with your routing number, is enough information for someone to set up automatic payments from your account or initiate transfers. This is why you should treat it as sensitive information — similar to how you would protect a password.

It is safe to provide your account number and routing number to your employer for direct deposit, to your bank for setting up bill pay, or to a business you are paying intentionally. It is not safe to share these numbers via email, text, or with someone who contacts you unexpectedly claiming to be from your bank. Legitimate banks do not ask for account numbers via unsecured channels.

If you write a check to someone, they will see your account number on the check itself. This is unavoidable and is considered normal. However, do not photograph or email a check image to someone unless you intend for them to have your account and routing numbers.

Finding your account number if you do not have a check

If you do not have a check available, your account number appears in several other places. Log into your online banking account — most banks display your account number prominently on the dashboard or in an account details section. Your monthly bank statement also lists your account number, usually near the top or in a summary section.

You can also call your bank's customer service line and provide your name and identification. They will confirm your account number over the phone. If you have a debit card issued by the bank, some banks print the account number on the card itself, though not all do.

The fastest option is usually online banking if you have access. The most reliable option if you are unsure of your login information is to call your bank directly.

Frequently Asked Questions

Is the account number the same on every check from my account?

Yes. Every check from the same account will have the same account number printed in the MICR line. The only number that changes from check to check is the check number itself. If you have multiple accounts at the same bank, each account has its own account number, and checks from different accounts will show different account numbers.

Can I use the account number from an old check?

Yes, as long as the account is still open. The account number does not change unless you close the account and open a new one. An old check from an active account will have the correct current account number. However, if the MICR line is faded or illegible, use a current statement or online banking instead to avoid transcription errors.

What if I see two different numbers that could be my account number?

The number in the MICR line at the bottom of the check is the official account number. If your account number is also printed elsewhere on the check in plain text, it should match the MICR line. If the two numbers differ, contact your bank — this is unusual and suggests either a printing error or a check from a different account than you thought.

Do I need both the routing number and account number to make a payment?

Yes. The routing number tells the payment system which bank to send the money to. The account number tells that bank which specific account within the bank should receive the money. Without both, the payment cannot be processed correctly. Both numbers appear together in the MICR line on your check.

Is it safe to write my account number on a check?

Your account number is already printed on every check you write, so anyone who receives a check from you will see it. This is considered normal and necessary for the check to be processed. However, do not write your account number on documents or in places where it is not needed, and do not share check images electronically unless you intend for the recipient to have your banking information.