The account number is the second set of digits printed on the bottom left of your check
Your bank account number appears on the bottom of every check you write. It sits between two other numbers: the routing number on the far left and the check number on the far right. The account number is usually 10 to 12 digits long, though the exact length varies by bank.
The three numbers work together. The routing number tells the banking system which bank holds your account. The account number identifies which specific account at that bank the money should come from or go to. The check number is just a reference for you to track which check you wrote.
All three numbers are printed in a special magnetic ink at the bottom of the check in what's called the MICR line — that stands for Magnetic Ink Character Recognition. This format lets banks process checks electronically without having to read the handwritten parts.
Key Takeaways
- Your account number is the middle set of digits on the MICR line at the bottom of your check, between the routing number and check number.
- Account numbers are typically 10 to 12 digits, but the length depends on your specific bank.
- You can also find your account number on your bank statement, in your online banking portal, or by calling your bank.
- Never share your full account number with someone you don't trust, even though it appears on every check you write.
How the three numbers are arranged on the check
The MICR line runs along the very bottom of the check. Reading from left to right, you see the routing number first (nine digits), then your account number (usually 10 to 12 digits), then your check number (usually four to six digits). Some checks print the check number twice — once in the MICR line and once in the upper right corner in regular ink.
The numbers are printed in a specific font that machines can read quickly. If you look closely, the digits have an unusual shape compared to regular printed numbers. This design lets banks sort and process thousands of checks per hour without manual handling.
The account number itself does not tell you anything about your account type or balance — it's just an identifier. Two people at the same bank will have completely different account numbers even if they have the same type of account.
Other places to find your account number
You don't need a check to find your account number. Your bank statement lists it at the top or in a summary section. If you use online banking, your account number appears in your account settings or dashboard — usually under "Account Details" or "Account Information."
You can also call your bank's customer service line and ask. Have your identification ready, because the bank will verify who you are before giving out account information. Many banks also print your account number on your debit card, though not always in a place that's easy to spot.
If you've lost all your checks and can't access online banking, a phone call to your bank is the fastest way to get the number. Most banks can tell you over the phone within a minute or two.
Why your account number is on every check you write
Checks are designed to be processed by machines, and machines need consistent, readable information. Printing your account number on every check means the bank doesn't have to look it up separately — the number is already there in the right format. This speeds up processing and reduces errors.
The downside is that your account number is visible to anyone who sees your check. This is why you should never leave blank checks lying around and why you should shred old checks before throwing them away. If someone has your account number and routing number, they can attempt to withdraw money from your account, though most banks have fraud protections in place.
That said, the fact that your account number appears on checks you've already written is not a security flaw — it's by design. Banks assume that anyone who receives a check from you already has your account number, so they focus fraud prevention efforts elsewhere.
What to do if you can't read the account number on your check
If the MICR line is smudged, faded, or damaged, you can still read the other numbers on the check. The routing number and check number are usually printed in regular ink in other places on the check, so you can cross-reference them. But the account number typically only appears in the MICR line.
If the MICR line is completely illegible, contact your bank directly. They can look up your account number using your name and routing number. You can also order new checks from your bank, which will have a fresh, readable MICR line.
Never try to guess or estimate your account number. If you're filling out a form that requires it, get the correct number from your bank or statement rather than trying to reconstruct it from a damaged check.
Account numbers and direct deposit or automatic payments
When you set up direct deposit for your paycheck or automatic bill payments, you'll need to provide both your routing number and account number. These are the same numbers that appear on your check. Some employers or billers ask you to write them down; others ask you to provide a voided check instead, which contains all the information they need.
A voided check is a check you've marked "VOID" across the front in large letters. This tells the bank not to process it if it's ever deposited, but it still contains all the routing and account information needed to set up automatic transfers. Many people find this safer than writing down the numbers separately, because the voided check is a single document you can hand over and then forget about.
Frequently Asked Questions
Is it safe to give someone my account number from my check?
It depends on who you're giving it to. Banks, employers, and established billers need your account number to set up direct deposit or automatic payments, and that's normal. Never give your account number to someone you don't know or trust, especially if they contact you unexpectedly. Legitimate companies will never ask for your account number via email or unsolicited phone call.
Can someone steal money from my account if they have my account number and routing number?
They can attempt to, but most banks have fraud protections that catch unauthorized withdrawals. If you notice suspicious activity, contact your bank immediately. Federal law limits your liability for unauthorized transfers if you report them quickly, though the exact rules depend on your bank and the type of account.
Why is my account number different from my check number?
Your account number identifies which account the money comes from. Your check number is just a reference for you to track individual checks you've written. You might write 50 checks from the same account, and each one has a different check number, but they all have the same account number.
What if I write down my account number wrong?
If you're setting up direct deposit or a bill payment and you write the account number incorrectly, the transfer will fail or go to the wrong account. The receiving bank will reject it if the account number doesn't match their records. Always double-check the number before submitting it, and compare it to your statement or online banking to make sure it's correct.