A routing number is a nine-digit code that tells the banking system which bank holds your account
Every bank in the United States has a routing number, also called an ABA number or routing transit number. When you send money to someone else's account—whether through direct deposit, a wire transfer, or an automatic payment—the routing number tells the system exactly which bank to send it to. Without it, the money would have nowhere to go.
The routing number is not secret. It's printed on the bottom left of every check you write, and your bank will give it to you on request. It's the same for everyone who banks at that institution, so your coworker and your neighbor have the same routing number if you use the same bank.
Think of it this way: your account number identifies your account. The routing number identifies your bank. Together, they tell the financial system where your money lives and which account to put it in.
Key Takeaways
- A routing number is a nine-digit code unique to each bank branch or institution, printed on the bottom left of checks.
- You need a routing number whenever someone sends you money by direct deposit, wire transfer, or automatic payment.
- Different banks have different routing numbers, and some large banks have multiple routing numbers for different regions or branches.
- You can find your routing number on a check, by calling your bank, or by searching your bank's name on the Federal Reserve's routing number database.
Where to find your routing number
The easiest place to find your routing number is on a check. Look at the bottom left corner—you'll see three groups of numbers. The first group, usually nine digits, is your routing number. The second group is your account number. The third is the check number.
If you don't have a check handy, call your bank's customer service line. They can tell you your routing number in seconds. You can also log into your online banking portal—many banks display it under account information or settings.
If you need to verify a routing number or find one for a bank you don't use, the Federal Reserve maintains a public routing number database. You can search by bank name and state, and it will return the correct nine-digit code.
Why banks have routing numbers and how they work
The routing number system exists because the U.S. has thousands of banks, and money moves between them constantly. Without a standardized way to identify each bank, transfers would be slow and error-prone. The routing number is that standardized identifier.
When you set up direct deposit at a new job, you provide your employer with your routing number and account number. Your employer's payroll system uses the routing number to find your bank, then uses your account number to deposit your paycheck into the right account. The same process happens when you set up automatic bill payments or transfer money to a friend's account.
Large banks sometimes have multiple routing numbers—one for each region or branch, or one for different types of accounts. If you're unsure which one applies to you, your bank's customer service can confirm it.
Routing numbers for different types of transfers
The routing number you use depends on what kind of transfer you're making. For direct deposit and automatic payments, you use your bank's standard routing number. For wire transfers, some banks use a different routing number—ask your bank which one to provide.
International wire transfers use a different system altogether. Instead of a routing number, you'll need a SWIFT code (also called a BIC code), which identifies your bank to the international banking network. Your bank can provide this if you need it.
ACH transfers—the system used for most domestic transfers between accounts—use your standard routing number. This is the system behind direct deposit, bill pay, and most peer-to-peer transfers.
What can happen if you give the wrong routing number
If you provide an incorrect routing number, the money usually doesn't disappear. Instead, it goes to the wrong bank. That bank will eventually realize the mistake and send it back to the sender, or contact you to sort it out. The process can take several days to a few weeks, depending on the banks involved.
If the routing number is close to correct but not quite right, the transfer may be rejected outright. Your bank will notify you, and you can resubmit with the correct number.
This is why it's worth double-checking before you submit a large transfer or set up automatic payments. A few seconds of verification saves you the headache of a delayed or misdirected payment.
Routing numbers and fraud prevention
A routing number alone cannot be used to steal money from your account. Someone would need both your routing number and your account number to access your funds. Even then, most banks have fraud detection systems that flag unusual transfers.
That said, don't post your routing number and account number together on social media or in public forums. While the routing number is not sensitive, pairing it with your account number creates a security risk. Your account number should stay private.
If you're concerned about a transfer you didn't authorize, contact your bank when ready. They can freeze your account and investigate.
Frequently Asked Questions
Is my routing number the same as my bank's routing number?
Usually yes. Most banks have one routing number for all customers. However, some large banks have multiple routing numbers for different regions, branches, or account types. Call your bank or check your check to confirm which one is yours.
Can someone steal money from my account if they have my routing number?
Not with just the routing number. They would also need your account number. Even then, most banks have fraud detection systems. If you notice an unauthorized transfer, contact your bank right away.
What's the difference between a routing number and an account number?
Your routing number identifies your bank. Your account number identifies your specific account within that bank. Together, they tell the banking system where to send money. You need both for most transfers.
Do credit unions have routing numbers?
Yes. Credit unions use the same routing number system as banks. You can find your credit union's routing number on a check, by calling them, or through the Federal Reserve's database.
What if I'm sending money internationally?
International transfers use a SWIFT code instead of a routing number. Ask your bank for the correct SWIFT code for the country you're sending to. Some banks also require an IBAN (International Bank Account Number) for certain countries.