Your account number is the second set of digits on the bottom left of your check
The bottom of a check contains three separate numbers printed in magnetic ink. Reading left to right, you see the routing number first (nine digits), then your account number (typically eight to twelve digits), then the check number (three to four digits). Your account number is always in the middle of these three groups.
The account number identifies your specific checking account at your bank. It stays the same across all checks you order from that account, so any check from your checkbook will show the same account number in that middle position.
If you cannot read the numbers clearly because the ink is faded or smudged, call your bank's customer service line or log into your online banking portal — both will display your account number without needing to read a physical check.
Key Takeaways
- Your account number appears as the middle set of digits on the bottom of any check, between the routing number and the check number.
- The account number is typically eight to twelve digits long and identifies only your specific account, not your bank.
- Every check from the same account shows the same account number, so you can use any check in your checkbook to find it.
- If the printed numbers are unreadable, your bank's website or customer service can provide your account number in seconds.
Why the order matters: routing, account, check
Banks print these three numbers in a specific sequence because each serves a different purpose. The routing number tells the banking system which bank holds the account. Your account number tells that bank which account within their system is yours. The check number is simply a reference for you to track which physical check you wrote.
When you give someone your account number alone, they cannot access your account without also knowing your routing number — the two work together. This is why banks ask for both pieces of information when you set up direct deposit or automatic payments.
What to do if your checks don't have printed numbers
Starter checks or temporary checks sometimes arrive without the magnetic ink numbers printed on the bottom. If your checks are blank in that area, do not try to write the numbers in by hand — banks will not accept handwritten account or routing numbers for processing.
Instead, contact your bank directly. They can provide both numbers over the phone or through your online account dashboard. You can also find these numbers on your bank statements, deposit slips, or the welcome materials your bank sent when you opened the account.
Using your account number safely
Your account number alone is not enough for someone to drain your account — they also need your routing number, and even then, most transfers require additional verification. However, you should still treat your account number as sensitive information and not share it with people you do not trust.
When you intentionally provide your account number (for direct deposit, bill payments, or wire transfers), verify you are communicating with your actual bank or a business you initiated contact with. Scammers sometimes call or email claiming to be your bank and asking for account numbers — your real bank already has this information and will not ask for it unsolicited.
Finding your account number on different check styles
Personal checks, business checks, and cashier's checks all display account numbers in the same location on the bottom. The format and position are standardized across all U.S. banks so that check-processing machines can read them automatically.
If you have very old checks (more than five to ten years old), the numbers may be harder to read because the magnetic ink fades over time. Newer checks will have crisp, clear numbers. If you need to reference an old check, your bank can look up the account number from their records using the check number and date.
When you need both numbers together
Most situations that require your account number also require your routing number. Direct deposit, ACH transfers, wire transfers, and setting up automatic bill payments all need both pieces of information. Your check provides both in one place, which is why many forms ask you to provide a voided check or to write down both numbers from your check.
If you are filling out a form that asks for your account number, check whether it also asks for your routing number on a separate line. If it does, make sure you are reading the correct set of digits from your check — putting the routing number in the account number field (or vice versa) will cause the transaction to fail.
Frequently Asked Questions
Can someone use just my account number to take money from my account?
No. They would need both your account number and routing number, plus they would typically need additional verification like your name, address, or a PIN depending on the type of transaction. Your account number alone is not sufficient to access your funds.
What if I cannot find a check to read my account number from?
Log into your online banking portal and look for your account details or account summary page — your account number is always displayed there. You can also call your bank's customer service line and they will provide it over the phone after verifying your identity.
Is the account number the same on every check I have?
Yes, every check from the same checking account will show the same account number. If you have multiple accounts at the same bank, each account has its own unique account number, and checks from each account will show their respective numbers.
Why do banks print the numbers in magnetic ink?
Magnetic ink allows high-speed check-processing machines to read the numbers automatically without needing to scan or photograph the check. This technology has been standard for decades and enables banks to process millions of checks quickly and accurately.