A routing code is a nine-digit number that identifies which bank or credit union holds your account
When you send money from your bank account—whether by wire transfer, ACH payment, or direct deposit—the routing code tells the financial system exactly where to send it. Without it, the money has no address. The code is specific to your bank and the branch or processing center that handles your account, not to you personally. Every bank, credit union, and some online financial institutions have their own routing code.
The routing code is also called a routing transit number (RTN) or ABA number. You will see these terms used interchangeably, though ABA number is the older name—it comes from the American Bankers Association, which created the system in 1910. The code has stayed largely the same for decades because it is the backbone of how money moves between institutions.
Key Takeaways
- A routing code is a nine-digit number unique to your bank or credit union that identifies where your account lives in the financial system.
- You need your routing code whenever you set up direct deposit, make a wire transfer, or authorize an ACH payment from your account.
- Your routing code is printed on the bottom left of your checks, and you can also find it on your bank's website or by calling customer service.
- The routing code is not secret—it is printed on every check you write—but you should never share your full account number along with it to strangers.
Where to find your routing code
The easiest place to find your routing code is the bottom left corner of any check you have written. The first nine digits printed there are your routing code. If you do not have checks, log into your bank's website or mobile app and look for account details or settings—most banks display the routing code there. You can also call your bank's customer service line and ask; they will give it to you immediately.
If you bank online with an institution that does not have physical branches, the routing code is still there. Online banks like Ally, Charles Schwab, and others all have routing codes. Check your account statements or the bank's website under account information. Some banks have more than one routing code if they process transactions through different centers, so make sure you are using the code for the specific type of transaction you are making—your bank's website will tell you which one to use.
Why banks ask for your routing code
Banks ask for your routing code because it is the only way to move money into or out of your account electronically. When your employer sets up direct deposit, they need your routing code and account number to send your paycheck to the right place. When you pay a bill online through your bank's bill pay service, the bank uses your routing code to debit your account. When someone sends you money via ACH transfer, their bank uses your routing code to find your bank and then your account number to find you.
Wire transfers, which move money faster than ACH but cost more, also require your routing code. If you are receiving a wire from another country, you may also need a SWIFT code (an international version of the routing code), but for domestic wires within the United States, the routing code is what matters.
Routing code versus account number
Your routing code and your account number are two different things, and both are needed to move money. The routing code identifies your bank; the account number identifies you within that bank. Think of it like an address: the routing code is the city and state, and the account number is your street address and house number. Together, they tell the financial system exactly where to send money.
Your account number is usually 8 to 12 digits long and appears on your checks, statements, and in your online banking portal. Unlike your routing code, your account number should be kept private. If someone has both your routing code and account number, they can set up unauthorized ACH transfers from your account. Your routing code alone—which is printed on every check you write—is not enough to drain your account, but it is the first piece of information a fraudster would need.
What happens if you use the wrong routing code
If you provide the wrong routing code, the money will go to the wrong bank. The sending bank will eventually catch the error and return the funds to the sender, but this can take several days or even weeks. During that time, you will not have the money, and the sender will not know what happened until the return shows up in their account.
If you accidentally use a routing code for a different branch of your own bank, the money may still reach you, but it could be delayed. Some banks route all transactions through a central processing center regardless of which branch you use, so the money arrives on time. Others process through the specific branch, which can add a day or two. If you are unsure, use the routing code your bank gives you on their website or in your account details—that is the one designed for electronic transactions.
Routing codes for different types of accounts
Most banks use the same routing code for checking and savings accounts, but some use different codes depending on the transaction type. A bank might have one routing code for ACH transfers and a different one for wire transfers. Your bank's website will list which code to use for which purpose, or you can call and ask. When you are setting up a specific transaction—like direct deposit or a bill payment—the form or website will usually tell you which routing code to enter.
Credit unions also have routing codes, and they work the same way as bank routing codes. If you are a credit union member, you can find your routing code on your checks or by logging into your credit union's online banking system. Some credit unions share a routing code with other credit unions in a network, so double-check that you have the right one for your specific institution.
How routing codes are structured
The nine digits of a routing code are not random. The first four digits identify the Federal Reserve district and the bank itself. The next four digits identify the specific branch or processing center. The last digit is a check digit—a mathematical verification that the first eight digits are correct. This structure has been in place since the ABA created the system and allows the Federal Reserve to sort and process millions of transactions every day.
You do not need to understand how the digits break down to use your routing code, but knowing that the last digit is a check digit explains why entering even one wrong digit will cause a transaction to fail. The system catches the error immediately and rejects the transaction rather than sending money to the wrong place.
Frequently Asked Questions
Is my routing code the same as my SWIFT code?
No. Your routing code is used for domestic transfers within the United States. A SWIFT code is used for international wire transfers. If you are sending or receiving money from outside the U.S., you will need a SWIFT code instead. Your bank can provide both if you ask.
Can someone steal money from my account if they only have my routing code?
Not with just the routing code alone. They also need your account number. Your routing code is printed on every check you write, so it is not secret. However, never give out your full account number to anyone you do not trust, especially not along with your routing code.
Do I need a different routing code for each bank account I have?
No. If you have multiple accounts at the same bank—like a checking and a savings account—they usually share the same routing code. The account number is what distinguishes one account from another. However, if you bank at multiple institutions, each one will have its own routing code.
What if my bank merged with another bank?
Your routing code may change after a merger. Your bank will notify you and update your account information. If you have set up direct deposit or automatic payments, contact your employer or the companies you pay to give them your new routing code. Your old routing code may still work temporarily, but using the new one ensures there are no delays.
Can I look up someone else's routing code?
Yes. Routing codes are public information. You can search for any bank's routing code online using free tools, or you can call the bank directly. Knowing a bank's routing code does not give you access to anyone's account—you would still need their specific account number to move their money.