The account number is printed at the bottom left of your check, after the routing number and before the check number
Your account number appears in the MICR line — the row of numbers printed in magnetic ink at the bottom of the check. It comes after a nine-digit routing number and before a four or five-digit check number. The account number is typically 10 to 12 digits long, though the exact length varies by bank.
The MICR line reads from left to right as: routing number, then account number, then check number. If you hold a check up to the light or look closely at the bottom, you'll see these three groups of numbers separated by the special symbols that look like colons with extra marks (called MICR symbols).
Not every number on your check is your account number. Your bank's name and address appear at the top. Your personal information (name, address) is printed in the upper left corner. The large number in the bottom right is the check number. Only the numbers in the MICR line at the very bottom contain your routing and account information.
Key Takeaways
- Your account number sits in the MICR line at the bottom of the check, between the routing number on the left and the check number on the right.
- The account number is typically 10 to 12 digits long and is the middle set of numbers in that bottom row.
- The MICR line uses special magnetic ink symbols to separate the routing number, account number, and check number.
- You can also find your account number on your bank statement, online banking portal, or by calling your bank if you need it for a transaction.
Why the order matters for payments and transfers
Banks and payment processors read the MICR line in a specific order because each number serves a different purpose. The routing number tells the payment system which bank to send the money to. Your account number tells that bank which of its thousands of accounts should receive (or send) the funds. The check number is for your own record-keeping and helps you track which check was used for which payment.
When you give someone a check or when a check is deposited, the recipient's bank scans the MICR line automatically. If the numbers are in the wrong order or if you misread them, the payment can be sent to the wrong account or rejected entirely. This is why banks print them in a standardized format on every check.
How to read the MICR line correctly
The MICR symbols look unusual because they're designed to be read by machines, not people. Each group of numbers is separated by a symbol that resembles a colon with extra marks on top and bottom. Start from the left: the first nine digits are your routing number. The next set of digits (usually 10 to 12) is your account number. The final group on the right is your check number.
If you're having trouble seeing the numbers clearly, try holding the check under bright light or using a magnifying glass. The magnetic ink is darker and slightly raised compared to regular printed text, which can make it easier to distinguish from other numbers on the check.
When you need to provide your account number
You'll need your account number when setting up direct deposit, arranging automatic bill payments, or receiving a wire transfer. You may also need it if you're transferring money between your own accounts at different banks or if someone is sending you a payment electronically.
For most of these transactions, you can provide just the account number and routing number — you don't need to hand over a physical check. If you're uncomfortable sharing a check image online, you can read these two numbers from the MICR line and type them in instead. Never share your full check image with anyone you don't trust completely, since it contains both numbers plus your signature.
Account number versus check number — the difference
The check number and account number are not the same thing, and mixing them up can cause problems. Your check number is unique to that single check — each check in your book has a different number printed in the bottom right corner and in the MICR line. Your account number is the same on every check you write from that account.
If someone asks for your "check number," they usually mean the number in the bottom right corner (the one you'd write on a receipt). If they ask for your "account number," they mean the middle set of digits in the MICR line. The distinction matters because the check number identifies one transaction, while the account number identifies your entire account.
What to do if the MICR line is damaged or unclear
If your check is torn, stained, or faded in a way that makes the MICR line hard to read, don't guess. Call your bank's customer service line and provide your name and the check number (the one in the bottom right corner). They can look up your account number in their system and confirm it for you.
If you're trying to deposit a damaged check, the bank may refuse it or ask you to contact the person who wrote it for a replacement. Banks rely on the MICR line to process checks automatically, and if the line is unreadable, the check has to be handled manually, which slows everything down.
Finding your account number if you don't have a check
You don't need a physical check to find your account number. Log into your online banking portal — it's usually displayed on your account dashboard or in your account settings. You can also find it on your monthly bank statement, usually near the top. If you prefer to call, your bank's customer service team can read it to you over the phone after they verify your identity.
Some banks also print your account number on your debit card, though not all do. Check the back of your card or the materials that came with it when you opened the account.
Frequently Asked Questions
Can someone use my account number if they see it on a check?
Your account number alone is not enough to drain your account or make unauthorized withdrawals. A thief would also need your routing number and would typically need additional verification depending on the type of transaction. However, you should still avoid sharing check images unnecessarily. If someone has both your routing and account numbers, they could potentially set up unauthorized automatic payments, so report any suspicious activity to your bank immediately.
Is the account number the same on every check I write?
Yes. Your account number stays the same for every check in your checkbook and every check you'll ever write from that account. The only number that changes is the check number in the bottom right corner. If you close the account and open a new one, you'll get a new account number.
What if I can't read the numbers in the MICR line?
Contact your bank directly — don't guess or try to read it from another check. Your bank can confirm your account number by looking up your account in their system. If the MICR line on your checks is consistently hard to read, ask your bank to reorder checks with better print quality.
Do I need to memorize my account number?
No. You should know where to find it, but you don't need to memorize it. Keep it in a safe place — your bank statement, online portal, or a secure password manager. Never write it down on a sticky note or store it in an unsecured location.
Why is the account number printed in special magnetic ink?
The magnetic ink allows banks to process checks automatically using machines that read the MICR line at high speed. This is why the numbers look darker and slightly raised compared to the rest of the text on the check. The standardized format and special ink make it possible to sort and deposit thousands of checks quickly without manual data entry.