Your account number is the second set of numbers printed at the bottom of your check, between the routing number and the check number.

When you look at the bottom of a check, you'll see three separate groups of numbers printed in magnetic ink. Reading from left to right, the first group is your bank's routing number — it identifies which bank issued the check. The middle group is your account number — it identifies your specific account at that bank. The third group, usually on the far right, is the check number — it's just a reference for that particular check.

Your account number is typically 10 to 12 digits long, though the exact length varies by bank. It's the same number whether you're looking at your first check or your last one from that account. You'll need this number if you're depositing a check through your phone or if you're setting up automatic payments.

Key Takeaways

  • The account number is the middle set of numbers at the bottom of your check, positioned between the routing number on the left and the check number on the right.
  • Account numbers are typically 10 to 12 digits long and remain the same for every check from that account.
  • When depositing a check by phone or online, you may need to enter your account number along with the routing number to verify the deposit.
  • If you cannot find the numbers on your check, your bank's customer service line or your online banking portal can provide both your routing and account numbers.

Why banks print numbers in a specific order

Banks arrange these three numbers in a standard order because the system was designed decades ago for machines to read them, not people. The magnetic ink and the specific placement allow bank processing equipment to sort checks quickly and route them to the correct account. Even though most checks are now processed electronically rather than physically, the layout has stayed the same.

Understanding which number is which matters because they do different jobs. The routing number tells the banking system which bank to send the money to. The account number tells that bank which account within the bank should receive the money. The check number is just for your own record-keeping — it helps you track which check you wrote and when.

What the numbers look like in practice

Here's an example of what you'd see at the bottom of a check:

⊢ 121000248 ⊣ ⊢ 1234567890 ⊣ ⊢ 1001 ⊣

In this example, 121000248 is the routing number, 1234567890 is the account number, and 1001 is the check number. Your actual numbers will be different, but they'll follow this same pattern. The account number is always in the middle position.

Some checks also print your account number in the upper right corner of the check itself, in regular-sized digits rather than magnetic ink. This is for human reference and makes it easier to spot if you're looking at your check in a hurry.

Finding your account number if your check is damaged or unclear

If the numbers at the bottom of your check are smudged, faded, or hard to read, you have other ways to find your account number. The easiest is to log into your online banking portal — your account number is usually displayed on your account overview page or in your account settings. You can also call your bank's customer service line; they can read your account number to you over the phone.

Your bank statement also lists your account number, usually near the top of the page. If you have a debit card from the same account, your account number may be printed on the card as well, though some banks omit it for security reasons.

Using your account number for mobile check deposits

When you deposit a check through your bank's mobile app, the system typically asks you to enter both the routing number and the account number from the check. This is how the app verifies that you're depositing the check into the correct account. You'll type in the numbers exactly as they appear at the bottom of the check.

Some apps use optical character recognition — meaning they can read the numbers automatically when you photograph the check — so you may not have to type them in manually. If the app can't read the numbers clearly, it will ask you to enter them by hand. Either way, double-check that the numbers match what's printed on the check before you confirm the deposit.

Why you might need this information beyond deposits

Your account number appears on checks because it's the standard way to identify your account in the banking system. You'll also need it if you're setting up direct deposit for a paycheck, arranging automatic bill payments, or sending money to someone else's account. Any time you're moving money into or out of your account, you may be asked for your account number to confirm where the money should go.

Keep in mind that your account number is not the same as your routing number, and you'll often need both. The routing number identifies your bank; the account number identifies your account within that bank. Mixing them up is a common mistake, but most banks will catch it and ask you to correct it before processing the transaction.

Frequently Asked Questions

Is my account number the same on all my checks?

Yes. Every check from the same account will have the same account number printed at the bottom. If you have multiple accounts at the same bank, each account will have its own account number, and checks from each account will show that account's specific number.

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

Your account number alone is not enough to transfer money out of your account — a thief would also need your routing number and usually some form of authorization or verification. That said, it's still a good idea not to share your account number with people you don't trust. If you're concerned about fraud, contact your bank when ready.

What if the numbers at the bottom of my check don't match what my bank told me?

Contact your bank right away. Mismatched numbers could indicate a printing error, a problem with your account, or in rare cases, fraud. Your bank can verify which numbers are correct and reorder checks if needed.

Do I need the check number for mobile deposits?

No. The check number (the third set of digits on the right) is not needed for mobile deposits. You only need the routing number and account number, which are the first two sets of numbers at the bottom of the check.