Your account number is the second set of numbers on the bottom of a check, printed between the routing number and the check number
When you look at the bottom left of a check, you'll see three separate groups of numbers printed in a special magnetic ink. The first group is your routing number (nine digits). The second group is your account number (usually 10 to 12 digits, though this varies by bank). The third group, on the far right, is the check number.
The account number identifies which specific account at your bank the check is drawn from. If you have multiple accounts — a checking account and a savings account, for example — each one has its own account number. The routing number tells the receiving bank which bank to send the money to; the account number tells that bank which account within your bank to pull the money from.
You need both numbers together to make a payment work. One without the other is incomplete. If someone asks for your account number, they almost always need your routing number too.
Key Takeaways
- Your account number appears as the second set of digits on the bottom of your check, between the routing number and the check number.
- Account numbers are typically 10 to 12 digits long, though the exact length depends on your bank.
- You should never share your account number with anyone unless you have initiated the transaction and trust the recipient.
- If you can't find your account number on a check, you can call your bank or log into your online banking to locate it.
Why the order matters on a check
The three numbers on the bottom of a check are always printed in the same order from left to right: routing number, account number, check number. This order is standardized across all U.S. banks, so once you know where to look, you can find your account number on any check you write.
The reason for this specific order comes from how checks are processed. Sorting machines read the routing number first to direct the check to the correct bank. Then the account number tells that bank's system which account to debit. The check number is last because it's mainly for your own record-keeping — it helps you track which check you wrote and when.
What your account number looks like
Account numbers are not all the same length. Some banks use 10 digits, others use 11 or 12. You might see your account number written as a continuous string of digits with no spaces or dashes, or your bank might print it with spaces between groups of digits for readability.
The account number itself contains no letters — only digits. If you're copying it down or reading it over the phone, you only need to say numbers. If you see letters mixed in with the numbers on your check, you're looking at the wrong section.
Finding your account number if you don't have a check
If you've run out of checks or haven't received them yet, your account number is still straightforward to find. Log into your online banking portal — most banks display your account number prominently on the dashboard or in an account details section. You can also call your bank's customer service line and ask them to read it to you after they verify your identity.
Some banks print your account number on your debit card, usually on the back or in fine print on the front. Your monthly bank statement also lists your account number, typically at the top of the first page.
When you need to share your account number
You'll need to provide your account number when you set up direct deposit for paychecks, arrange automatic bill payments, or receive a wire transfer from someone. You may also need it if you're setting up a payment to a government agency or a large organization.
Only share your account number with people or organizations you trust and who have a legitimate reason to request it. If someone calls you unexpectedly asking for your account number, do not give it to them — legitimate businesses will never call you asking for this information. If you initiated the contact (for example, you called your utility company to set up a payment), then it's safe to provide.
The difference between account number and routing number
These two numbers work together but do different jobs. Your routing number identifies your bank — it's the same for everyone who banks there. Your account number identifies your specific account within that bank — it's unique to you.
Think of it like an address. The routing number is like the city and state (the same for many people). The account number is like your house number on a specific street (unique to your home). You need both pieces of information for money to reach the right place.
Frequently Asked Questions
Is it safe to write my account number on a check?
Yes. When you write a check, you're intentionally sharing your account number with the person or business receiving it. They need it to deposit or cash the check. The risk comes only if you share your account number with someone you don't trust or who hasn't asked for it.
What if I give someone my account number by mistake?
Contact your bank right away and let them know. They can monitor your account for suspicious activity and may issue you a new account number if needed. Most banks have fraud protection, but the sooner you report it, the better.
Can someone withdraw money if they only have my account number?
They would need your routing number as well, and even then, most banks require additional verification before processing a withdrawal. If you're concerned, call your bank and ask what protections are in place for your account.
Why is my account number different from my debit card number?
Your debit card number and your account number are two separate identifiers. The debit card number is for card transactions. Your account number is for bank transfers and direct deposits. They're linked to the same account but serve different purposes.
How do I know which number is which on my check?
Look at the bottom left of the check. Count the groups of numbers from left to right: the first group (9 digits) is routing, the second group (usually 10-12 digits) is account, and the third group (4-5 digits) on the far right is the check number. If you're still unsure, call your bank and they can walk you through it.