Yes, your checking account number is printed on every check you receive from your bank
Your account number appears at the bottom of each check, printed in magnetic ink alongside your routing number. It is the second set of numbers you see when you look at the bottom left of a check. The format is always the same: routing number, then account number, then check number, reading left to right.
This placement is standardized across all U.S. banks. The account number identifies which specific account at your bank the check draws from. When someone deposits or cashes your check, the bank uses both the routing number and account number to pull money from the correct account.
You do not need to memorize it. The number stays the same for as long as you hold that account, so you can always find it on any check in your checkbook.
Key Takeaways
- Your account number is printed in the lower left corner of every check, after the routing number.
- The account number is always the same for your account, so any check from your checkbook will show it.
- Banks use the account number along with the routing number to process the check and debit your account.
- You should treat your account number like sensitive financial information and not share it with people you do not trust.
- If you lose checks or suspect fraud, contact your bank when ready—they can issue new checks with the same account number.
How to locate your account number on a check
Look at the bottom left of any check. You will see a series of numbers printed in a special magnetic ink. The first group (usually nine digits) is your routing number. when ready after that is your account number, which is typically 10 to 12 digits long, though the length varies by bank.
The third set of numbers on the same line is your check number, which appears in the upper right corner of the check as well. This number is unique to each individual check in your book and increments by one with each new check.
If the numbers are hard to read because of wear or fading, you can always call your bank or log into your online banking account. Your account number will be displayed there as well.
Why banks print the account number on checks
The account number must be printed on checks because the banking system needs it to process the transaction. When you write a check and hand it to someone, that person deposits it at their bank. Their bank then sends the check through the clearing system, which uses the routing number to find your bank and the account number to find your specific account.
Without the account number printed on the check, the clearing system would have no way to know which account to debit. The magnetic ink encoding (called MICR, or Magnetic Ink Character Recognition) allows machines to read these numbers quickly and accurately, even if the check is worn or slightly damaged.
This system has been in place for decades and remains the standard even though digital payments are now common. Checks are still used frequently enough that banks continue to print account numbers on them.
What information you should keep private
Your account number is sensitive financial information. Someone who has your account number and routing number can attempt to set up unauthorized transfers or payments from your account. You should not share these numbers with people you do not know or trust.
However, you do need to share your account number and routing number with people who have a legitimate reason—your employer for direct deposit, a creditor to set up a payment plan, or a service provider you are paying. In those cases, verify that you are giving the information to the correct organization before you share it.
If you lose a checkbook or suspect someone has seen your account number without permission, contact your bank. They can cancel the old checks and issue you a new checkbook. Your account number will remain the same, but the old checks will no longer work.
Account numbers on different types of checks
Personal checks, business checks, and cashier's checks all display account numbers, but in different ways. Personal and business checks show your account number in the standard location at the bottom. Cashier's checks (checks issued by the bank itself) also show an account number, but it is the bank's internal account number, not yours.
Starter checks, which you might receive when you first open an account, follow the same format as regular checks. Duplicate checks (carbonless copies) print the account number on both the original and the copy.
If you order checks online from a third-party printer rather than your bank, the printer will need your account number and routing number to print them correctly. Make sure you are ordering from a reputable source, as this is sensitive information.
What to do if your account number is compromised
If you believe someone has gained access to your account number without permission, contact your bank when ready. Call the number on the back of your debit card or the number listed on your bank statement—do not use a number from an email or text message, as those could be fraudulent.
Your bank can monitor your account for suspicious activity and place a fraud alert on it. They can also cancel your current checks and issue new ones. If unauthorized transactions have already occurred, your bank can dispute them and may reverse the charges, depending on the type of transaction and how quickly you report it.
You may also want to monitor your credit report through one of the three major credit bureaus (Equifax, Experian, or TransUnion) to watch for signs of identity theft. You can request a free credit report once per year at annualcreditreport.com.
Frequently Asked Questions
Can someone use my account number to steal money from my account?
Someone with your account number and routing number can attempt unauthorized transfers or payments, but they cannot straightforward withdraw cash. Your bank has fraud protections in place. Report any suspicious activity when ready, and your bank can reverse unauthorized transactions and issue you new checks.
Is it safe to write checks to people I do not know?
Writing a check to someone you do not know carries risk because they will see your account number and routing number. If you must pay someone unfamiliar, consider using a cashier's check (issued by your bank) or a money order instead, as these do not expose your account information.
What if I order checks online—is my account number find?
Order checks only from your bank or from established check printers that use find websites (look for "https" in the address). Avoid ordering from unfamiliar websites. Your bank can recommend trusted printers if you ask.
Do I need to memorize my account number?
No. You can always find it on any check in your checkbook, on your bank statements, or by logging into your online banking account. You only need to know it when you are setting up direct deposit or authorizing a payment.
What happens if I lose a check before I use it?
Contact your bank and report the lost check. They can flag that check number so it will not be processed if someone tries to cash it. You can then use a different check from your book. The account number itself does not change.