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

The bottom left of any check shows three separate numbers in magnetic ink. Reading left to right, you see the routing number first (nine digits), then your account number (typically 10 to 12 digits), and finally the check number on the far right (usually four to five digits). Your account number identifies which specific account at your bank the check draws from.

The account number stays the same across all checks from that account. If you write 50 checks from the same checking account, every one will have the identical account number printed on it. This is different from the check number, which increments with each new check in your book.

You need both the routing number and account number together when you set up direct deposit, arrange automatic payments, or receive wire transfers. Banks and payment processors use the routing number to find your bank, then the account number to find your specific account within that bank.

Key Takeaways

  • The account number is the middle set of digits on the bottom of your check, between the routing number on the left and the check number on the right.
  • Account numbers are typically 10 to 12 digits long, though the exact length varies by bank.
  • The same account number appears on every check from that account, while the check number changes with each new check you write.
  • You will need your account number for direct deposit setup, bill payments, and wire transfers.

How to read the MICR line on your check

The three numbers at the bottom of your check are printed in MICR format — Magnetic Ink Character Recognition. This special ink and font allow bank machines to read the numbers automatically when checks are processed. The numbers appear in this order: routing number, account number, check number.

If you have trouble reading the printed numbers because of ink fading or poor quality, you can find your account number in other places. Your bank statement lists it. Your debit card may show it. Your online banking login will display it. You can also call your bank's customer service line and they will read it to you over the phone.

Account number length varies by bank

Most account numbers run 10 to 12 digits, but some banks use shorter or longer numbers. Wells Fargo account numbers are typically 10 digits. Chase uses 10 digits. Bank of America uses 10 digits. Credit unions often use 9 or 10 digits. Some regional banks use 12 or more.

The length does not matter for your purposes — what matters is that you copy the entire number exactly as it appears on your check. If you miss a digit or transpose two numbers, the routing and account number combination will not match your actual account, and the transaction will fail or go to the wrong place.

Why banks print the account number on checks

Checks are designed to be processed both by people and by machines. The MICR line at the bottom allows sorting machines to read the routing and account numbers at high speed, directing each check to the correct bank and account. Without this standardized format, check processing would require manual data entry for every single check.

The account number is also printed in regular digits above the MICR line on most checks, making it readable to humans. This redundancy ensures that if the magnetic ink line is damaged or unreadable, the check can still be processed manually.

When you need to provide your account number

You will give out your routing number and account number together when you set up direct deposit for paychecks or government payments. Your employer or the payment source needs both numbers to deposit money into the correct account at the correct bank.

You also need both numbers when you arrange automatic bill payments through your bank or through a biller's website. If you want to receive a wire transfer, you will provide these numbers to the person or organization sending the money. Some online payment services ask for them as well.

You do not need to provide your account number for everyday debit card purchases or ATM withdrawals — your debit card and PIN handle those transactions. You also do not need it to write checks; the number is already printed on them.

Protecting your account number

Your account number is not as sensitive as your PIN or online banking password, but you should still treat it with reasonable care. Never post it on social media or in public forums. Do not email it to someone unless you initiated the contact and you are certain they are legitimate.

When you provide your account number over the phone, make sure you called the bank or organization directly using a number from their official website or your statement — not a number from an email or text message. Scammers sometimes send fake emails or texts asking you to "verify" your account number by calling a fraudulent number.

If you suspect someone has your account number and you did not authorize them to have it, contact your bank immediately. They can monitor the account for unauthorized activity and issue you a new account number if needed, though this also means getting new checks printed.

Finding your account number if you do not have a check

If you do not have a check in front of you, your bank statement shows your account number at the top or in the account summary section. Log into your online banking and look for account details or account information — the number will be displayed there. Your debit card may also print your account number on the front or back, depending on your bank.

You can also call your bank's customer service number, which is on the back of your debit card or on your statement. Provide your name and other identifying information, and they will read your account number to you. This is a secure way to get the number if you need it urgently.

Frequently Asked Questions

Is the account number the same as the check number?

No. The account number is the middle set of digits and stays the same on all your checks. The check number is on the far right and increments with each new check you write. You need the account number for electronic transfers; the check number just identifies which individual check you are writing.

Can someone access my account with just the account number?

Not without your routing number as well, and even then they cannot withdraw money without additional authorization. Your account number and routing number together identify your account, but they do not give someone permission to move money. They would also need your PIN, online banking password, or other verification to actually transfer funds.

What if I give the wrong account number for direct deposit?

The deposit will go to the wrong account or be rejected. If it goes to another real account at the same bank, that bank will eventually catch the error and return the money to the sender. If the number does not match any account, the payment will bounce back. Contact your employer or the payment source immediately to provide the correct number.

Do I need to memorize my account number?

No. Write it down and keep it in a safe place, or store it in your phone's notes app with a password. You can also look it up on your statement or in your online banking whenever you need it. Most people do not memorize it because they rarely need to provide it.

Will my account number change if I move to a different branch?

No. Your account number stays the same even if you move, switch branches, or change your address. The routing number might change if you move to a different state and switch to a local bank, but if you stay with the same bank, your account number does not change.