A checking account has three separate number sequences you need to know
Your checking account actually uses three different sets of numbers, and each one does a different job. The routing number identifies your bank. The account number identifies your specific account at that bank. The check number identifies each individual check you write. When you set up direct deposit, write a check, or send a wire transfer, you'll use different combinations of these three.
The routing number is always nine digits. The account number is typically between 8 and 12 digits, though it varies by bank. Check numbers are usually four digits printed in the bottom right corner of each check. You don't need to memorize any of them — they're printed on your checks and available in your online banking portal — but knowing what each one is for keeps you from mixing them up when someone asks for a specific number.
Key Takeaways
- Your routing number (nine digits) tells the banking system which bank holds your account, and it's the same for all customers at that bank.
- Your account number (usually 8 to 12 digits) identifies your specific account and is unique to you; never share it with someone you don't trust.
- Check numbers (usually four digits) are printed on each check and help you track which checks you've written, but they're not required for electronic transfers.
- You can find all three numbers on a paper check, and your routing and account numbers are also available through your bank's website or mobile app.
Where to find your routing number
The routing number is printed on the bottom left of every check you receive from your bank. It's a nine-digit code that never changes for your bank, even if you open a new account or move to a different branch. If you don't have a check handy, you can find it on your bank's website — most banks list it under "banking information" or "account details" — or by calling the customer service number on the back of your debit card.
The routing number is public information. You can safely give it to your employer, your landlord, or anyone else who needs to send you money through direct deposit or an electronic transfer. The routing number alone cannot be used to withdraw money from your account; someone would also need your account number to do that.
Where to find your account number
Your account number is printed on the bottom center of every check, right after the routing number. It's usually 8 to 12 digits long, though the exact length depends on your bank. This number is unique to your account and should be treated like sensitive information — don't share it with people you don't know or trust, and don't post it on social media or in public forums.
You can also find your account number in your online banking portal or mobile app, usually under "account details" or "account information." If you've lost a check and need the number, log into your bank's website or call customer service. Never give your account number to someone who calls you claiming to be from your bank; legitimate banks will never ask for it over the phone.
What check numbers are for and why they matter
The check number is printed in the bottom right corner of each check and is usually four digits. It's a sequential number that increases with each check in your checkbook — your first check might be 1001, the next 1002, and so on. The check number helps you keep track of which checks you've written and when, which is useful for balancing your account or finding a specific payment you made weeks ago.
Check numbers are not required for electronic payments or direct deposits. You only need them when you're writing a physical check. If you write a check and want to remember what it was for, you can note the check number in your records along with the date, payee, and amount. Some banks also let you see images of checks you've written in your online portal, which makes tracking easier.
The difference between routing numbers and account numbers
The routing number is shared by every customer at your bank — all Chase customers in your region have the same routing number, for example. The account number is unique to you. Think of it this way: the routing number is like the address of the bank building, and the account number is like the apartment number inside that building. Together, they tell the banking system exactly where your money is.
When you set up direct deposit, you'll give your employer both numbers. When you receive a wire transfer, the sender needs both. If you're paying a bill by check, the check itself contains all three numbers (routing, account, and check number), so the recipient has everything they need to process it. If you're paying electronically, you typically only need the routing and account numbers.
What happens if you give out the wrong number
If you accidentally give someone your account number instead of your routing number, or vice versa, the transaction usually just fails. The banking system won't process a direct deposit or transfer if the numbers don't match up correctly. The sender will get an error message and will need to ask you for the correct information and try again.
If you've given your account number to someone you don't trust, contact your bank right away. You can request a new account number, though this is a bigger change than it sounds — your direct deposits, automatic bill payments, and other recurring transfers will all need to be updated with the new number. Your bank can walk you through the process, but it's easier to just be careful about who you share the number with in the first place.
How banks use these numbers in different situations
| Type of Transaction | Routing Number Needed | Account Number Needed | Check Number Needed |
|---|---|---|---|
| Direct deposit (paycheck) | Yes | Yes | No |
| Wire transfer | Yes | Yes | No |
| ACH transfer (online payment) | Yes | Yes | No |
| Writing a check | Yes | Yes | Yes |
| Setting up automatic bill pay | Yes | Yes | No |
Frequently Asked Questions
Can someone steal money from my account if they only have my routing number?
No. The routing number alone is not enough to access or withdraw from your account. Someone would need both your routing number and your account number to initiate a transfer or set up a payment. The routing number is public information — it's printed on every check — so it's safe to share with employers, landlords, and anyone else who needs to send you money.
Why does my bank's routing number appear on checks if it's public information?
Because checks are designed to work within the banking system, and the routing number is essential for the system to function. When you write a check, the routing number tells the receiving bank which institution to contact to collect the funds. It's printed on every check because it needs to be there for the check to clear.
Do I need to memorize my account number?
No. You can always find it on a check, in your online banking portal, or by calling your bank. Most people don't memorize it. Just keep your account number private and only share it with people and organizations you trust, like your employer or your bank itself.
What if I write a check and the check number is wrong or missing?
The check will still work. The check number is for your record-keeping, not for the banking system. The routing number and account number are what matter for processing the payment. However, it's a good idea to use the check numbers in order so you can track which checks you've written.
Can I change my account number if I'm worried about security?
Yes, but it's a significant change. You'll need to update your account number with your employer, any service providers who have automatic payments set up, and anyone else who regularly sends you money. Contact your bank to discuss whether a new account number is necessary or whether other security measures would solve your concern.