The routing number is in the bottom left corner of your check, printed in a specific nine-digit format
When you look at a physical check, the routing number appears at the very bottom left, before your account number. It is always nine digits long and is printed in a special magnetic ink that machines can read. The routing number identifies which bank or credit union issued the check — it tells the payment system where to send the money.
The bottom of every check has three sets of numbers printed in this magnetic ink. From left to right, you see the routing number first, then your account number, then the check number on the far right. The routing number never changes for your account; it stays the same whether you order new checks or have been banking there for years.
Key Takeaways
- Your routing number is the nine-digit code at the bottom left of your check, printed before your account number.
- The routing number identifies your specific bank or credit union branch and does not change between check orders.
- You can also find your routing number on your bank's website, by calling the customer service number on the back of your debit card, or through your online banking portal.
- The routing number is different from your account number — routing identifies the bank, while the account number identifies you within that bank.
Why the routing number sits where it does on the check
The routing number goes in the bottom left because that is where automated check-reading machines look for it first. When a check moves through the banking system — from your recipient's bank to your bank — machines scan that bottom section to sort checks by institution. The magnetic ink allows machines to read the number even if the check is worn, faded, or has other marks on it.
The order matters: routing number, then account number, then check number. This sequence is standardized across all U.S. banks, so any machine in any bank can read checks the same way. If you write a check and the recipient deposits it, their bank's machine reads the routing number first to know which bank to pull the money from.
How to read the numbers at the bottom of your check
Look at the bottom of any check you have. You will see three separate groups of numbers in that special magnetic ink. The leftmost group is always nine digits — that is your routing number. Write it down exactly as printed, with no dashes or spaces, even though some banks display it with dashes when you see it online.
The middle group is longer, usually ten to twelve digits. That is your account number. The rightmost group, usually four or five digits, is the check number — it matches the number printed in the top right corner of the check. If any of these numbers are hard to read because the check is old or damaged, do not guess. Call your bank or log into your online banking account instead.
Finding your routing number if you do not have a check
You do not need a physical check to find your routing number. Log into your online banking portal or mobile app — most banks display the routing number in the account details section. You can also call the customer service number on the back of your debit card and ask; the representative will give you the nine-digit number over the phone.
Your bank's website usually has a routing number lookup tool as well. Search for "[Your Bank Name] routing number" and you will find a page where you can enter your state or branch location. Some banks list the routing number on statements or in the welcome materials they sent when you opened the account.
The difference between routing number and account number
The routing number identifies your bank or credit union. The account number identifies you within that bank. Think of it this way: the routing number is like the address of the bank building, and the account number is like your apartment number inside that building. When you write a check, both numbers are needed so the payment system knows which bank to contact and which account within that bank to pull the money from.
If you switch banks, your routing number changes but your account number at the new bank is completely different. If you stay at the same bank and open a second account, your routing number stays the same but you get a new account number for the new account.
What happens when someone reads your routing number from a check
Your routing number is not secret information — it is printed on every check you write and is meant to be read by banks and payment systems. Knowing your routing number alone does not let someone take money from your account. They would also need your account number, and even with both numbers, they cannot withdraw funds without authorization from you or the bank.
Your routing number is safe to share when you need to set up direct deposit, arrange wire transfers, or receive payments from employers or government agencies. Banks expect you to provide it in these situations. The account number is more sensitive, but even that is not enough on its own — the bank verifies your identity through other means before moving money.
Routing numbers for different types of accounts
If you have a checking account, a savings account, and a money market account at the same bank, they all share the same routing number. The routing number identifies the bank, not the type of account. Your account number is what distinguishes between your checking and savings accounts at that bank.
If you bank at multiple institutions, each one has its own routing number. A credit union routing number is different from a commercial bank routing number, even if both are in your state. When you need to provide routing information for direct deposit or transfers, make sure you are using the routing number for the specific bank or credit union where that account lives.
Frequently Asked Questions
Can I use the routing number from an old check?
Yes. The routing number does not change as long as you keep the account at the same bank. An old check from five years ago has the same routing number as a new check today. However, if your bank merged with another bank or you switched institutions, the routing number may have changed.
What if the numbers at the bottom of my check are smudged or unclear?
Do not try to guess or fill in numbers. Call your bank's customer service line or log into your online account to find the correct routing number. A wrong routing number will send your payment to the wrong bank, and it may take days to correct.
Is the routing number the same for all branches of my bank?
Usually yes, but not always. Most large banks use one routing number for all branches nationwide. Some regional banks or credit unions have different routing numbers for different branches. Check with your bank if you are unsure, especially if you opened your account at a specific branch location.
Do I need both the routing number and account number to receive a wire transfer?
Yes. The sender needs both your routing number and your account number to send you money by wire. Some banks also ask for your full name and the bank's wire transfer address. Ask your bank what information to give the sender.
Can someone steal money using just my routing number?
No. Your routing number alone is not enough to access your account. A person would need your account number as well, and even then, the bank has security measures to verify that any withdrawal or transfer is authorized by you.