The account number is the second set of digits on the bottom left of your check
Your 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 typically 10 to 12 digits long, though the exact length depends on your bank.
The three numbers appear in this order from left to right: routing number, account number, check number. They are printed in magnetic ink at the bottom of the check in a format called MICR (Magnetic Ink Character Recognition). This layout is the same across nearly all U.S. banks, so once you know where to look on one check, you can find it on any other check from the same account.
You do not need to write down the account number yourself—it is already printed there. If you are setting up a direct deposit, paying a bill by check, or providing banking details to someone else, you can simply read it directly from any check in your checkbook.
Key Takeaways
- Your account number is the middle set of digits printed at the bottom of your check, between the routing number and the check number.
- Account numbers are typically 10 to 12 digits long and printed in magnetic ink that machines can read.
- The account number is the same on every check from your account, so you only need to look at one check to find it.
- If you cannot locate a check, you can find your account number on your bank statement, online banking portal, or by calling your bank.
- Never share your account number with anyone you do not trust, as it can be used to set up unauthorized payments from your account.
Why banks print the account number on checks
The account number on your check serves two purposes. First, it tells the banking system which account to pull money from when the check is deposited or cashed. Without it, a bank would have no way to know whose account to debit. Second, it allows you to keep a record of which account a particular check came from if you have multiple accounts at the same bank.
The magnetic ink used to print these numbers allows sorting machines at banks to read the numbers automatically, which speeds up check processing. This system has been in place since the 1950s and remains the standard across the banking industry, even though digital payments have become more common.
What the other numbers on the bottom of your check mean
The bottom of your check contains three separate pieces of information, each serving a different purpose. Understanding what each one does can help you provide the correct number when someone asks for your banking details.
| Number | Position | What it does |
|---|---|---|
| Routing number | Far left (9 digits) | Identifies your specific bank or credit union |
| Account number | Middle (10–12 digits) | Identifies your specific account within that bank |
| Check number | Far right (4–5 digits) | Identifies this particular check for your records |
When you set up direct deposit or authorize an automatic payment, you will usually need both the routing number and the account number. The check number is for your own record-keeping and is not needed for banking transactions.
Where to find your account number if you do not have a check
If you do not have a check available, your account number appears in several other places. Your bank statement—whether printed or online—shows your account number at the top or in the account details section. If you use online banking, log in to your account and look for an account summary or account details page; the number is usually displayed prominently there.
You can also call your bank's customer service line and provide your name and identification to confirm your account number over the phone. Many banks also print your account number on your debit card, though not always in an obvious place—check the back or the fine print on the front.
If you are trying to find the account number for a business account or a joint account, the same methods apply: check a statement, log into online banking, or call the bank directly.
How to protect your account number
Your account number is not secret in the same way a password is—it is printed on every check you write and visible to anyone who receives a check from you. However, you should still avoid sharing it unnecessarily. Someone with your account number and routing number can set up unauthorized automatic payments or transfers from your account.
When you provide your account number to someone, make sure it is for a legitimate purpose: setting up direct deposit with your employer, paying a bill to a known company, or transferring money to someone you trust. Do not provide it in response to unsolicited phone calls, emails, or text messages, even if the person claims to be from your bank. Real banks will never ask you to confirm your account number by email or text.
If you suspect someone has used your account number without permission, contact your bank immediately. Most banks can reverse unauthorized transactions if you report them within a certain timeframe, usually 30 to 60 days.
Account numbers on different types of checks
Personal checks, business checks, and cashier's checks all display the account number in the same location at the bottom. The format and position are standardized across all U.S. banks. If you are looking at a check from a different country, the layout may be different—other countries use different banking systems and check formats.
Starter checks (the temporary checks a bank gives you when you open an account) also have the account number printed in the standard location. Some banks print the account number in a slightly different font or position on starter checks, but it is still in the bottom-left area of the check, between the routing number and check number.
Frequently Asked Questions
Is the account number the same on every check I write?
Yes. Every check from the same account has the same account number printed on it. The only number that changes is the check number, which increments by one for each check you write. This allows you to track which checks you have written and in what order.
Can someone use my account number to steal money from my account?
Someone with your account number and routing number can attempt to set up unauthorized automatic payments or transfers. However, most banks have fraud protections in place. If you notice unauthorized activity, report it to your bank right away—you are usually protected from liability if you report it within 30 to 60 days.
What if the numbers at the bottom of my check are smudged or hard to read?
If the magnetic ink is damaged or unclear, you can still find your account number on your bank statement or online banking portal. You can also call your bank and ask them to confirm it. Do not use a check with illegible numbers for important transactions, as it may not process correctly.
Do I need my account number to deposit a check?
No. When you deposit a check into your own account, the teller or mobile app already knows which account you are depositing into. You only need to provide your account number when you are setting up a payment from your account or authorizing someone else to withdraw from it.
Is my account number visible to the person I write a check to?
Yes. Anyone who receives a check from you can see your account number, routing number, and check number printed on the bottom. This is why you should only write checks to people and organizations you trust. Avoid writing checks to strangers or in response to unsolicited requests.