A routing code is a nine-digit number that identifies the specific bank or credit union where your account lives
When you send money from your account to someone else's, that nine-digit code tells the banking system exactly which institution to pull the money from. It works like a postal code for banks — it narrows down the destination from "a bank somewhere in America" to "this specific branch of this specific institution." Without it, the system would not know whether to look in Chase's network or Wells Fargo's or a small regional credit union.
The routing code is also called an ABA number or routing transit number (RTN). All three names refer to the same thing. The American Bankers Association created the system decades ago, which is why you still see "ABA" used today, even though the codes themselves are now managed by Fedwire and the ACH network.
You need a routing code whenever you set up direct deposit, send a wire transfer, or arrange automatic bill payments. It is one of two pieces of information the receiving bank needs — the other is your account number. Together, they tell the system where to send the money and which account to deposit it into.
Key Takeaways
- A routing code is a nine-digit number that identifies your specific bank or credit union within the U.S. banking system.
- You will need your routing code for direct deposit, wire transfers, ACH payments, and setting up automatic bill pay.
- 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.
- Different branches of the same bank may have different routing codes, so always verify you have the correct one for your specific location.
- Routing codes are different from SWIFT codes, which are used for international transfers and are longer than nine digits.
Where to find your routing code
The easiest place to find your routing code is on a check from your account. Look at the bottom left corner — you will see three groups of numbers. The first group, on the far left, is your routing code. It is always nine digits long.
If you do not have checks handy, log into your bank's website or mobile app. Most banks display the routing code in the account details section, sometimes labeled "Bank Information" or "Account Details." You may need to click through to a specific account if you have multiple accounts at the same bank.
You can also call your bank's customer service line and ask for your routing code. Have your account number ready when you call. Some banks also print the routing code on statements or deposit slips, though this is less common now.
How routing codes are structured
The nine digits in 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 final digit is a check digit — a mathematical verification that the first eight digits are correct and were entered without error.
This structure means that two branches of the same bank in different cities will often have different routing codes. A Chase branch in New York and a Chase branch in Los Angeles may use different codes because they process through different Federal Reserve districts or clearing centers. This is why you must use the routing code for the specific branch where your account is held, not just any branch of that bank.
Routing codes versus account numbers
A routing code and an account number work together but do different jobs. The routing code identifies the bank; the account number identifies you within that bank. Think of it this way: the routing code is like the address of a post office, and the account number is like your mailbox number inside that post office.
When you give someone your banking information for a transfer, you need both pieces. The routing code tells the system which bank to contact. The account number tells that bank which of its thousands of accounts to deposit the money into. Without the routing code, the bank would not know where to send the money. Without the account number, the receiving bank would not know whose account to credit.
When you need a routing code
Direct deposit: Your employer or the government agency sending you a refund or payment needs your routing code and account number to deposit money directly into your account instead of sending a check.
Wire transfers: If you are sending money to another bank, you will need the recipient's routing code and account number. Wire transfers are faster than ACH transfers but usually cost a fee.
ACH payments: Automatic bill payments, payroll deductions, and transfers between your own accounts at different banks all use the ACH network, which requires a routing code.
Setting up automatic payments: When you arrange for a company to withdraw money from your account on a regular schedule — like a utility bill or insurance premium — they need your routing code and account number.
Routing codes for different types of accounts
Most people think of routing codes as belonging to checking accounts, but savings accounts, money market accounts, and other deposit accounts also have routing codes. In many cases, the routing code is the same across all account types at the same bank branch, but not always. If you are setting up a transfer to or from a savings account, confirm with your bank that you have the correct routing code for that specific account type.
Credit unions use routing codes the same way banks do. If your account is at a credit union, you will find the routing code on your checks or in your account details online, just as you would at a bank. Some credit unions have multiple routing codes depending on which branch or processing center handles your account.
Routing codes and international transfers
Routing codes only work within the U.S. banking system. If you are sending money to or receiving money from outside the United States, you will need a SWIFT code instead. A SWIFT code is longer than a routing code — usually 8 to 11 characters — and identifies banks internationally.
Some banks have both a routing code and a SWIFT code. The routing code handles domestic transfers; the SWIFT code handles international ones. If someone outside the U.S. is sending you money, ask them to use your SWIFT code, not your routing code. Your bank can provide your SWIFT code if you ask.
What happens if you use the wrong routing code
If you enter an incorrect routing code, the transfer may be rejected outright, or it may be sent to the wrong bank. If it goes to the wrong bank, that bank will eventually reject it and send it back to the originating bank, which then returns it to the sender. This process can take several business days, and your money will be delayed.
In rare cases, a transfer sent to the wrong routing code might be deposited into someone else's account if the account number happens to match an account at that bank. This is why it is important to double-check both the routing code and the account number before confirming any transfer. Most banks allow you to verify account information before a large transfer goes through.
Frequently Asked Questions
Is my routing code the same at every branch of my bank?
Not necessarily. While many branches of the same bank share a routing code, some banks assign different codes to different branches or processing centers. Always use the routing code for the specific branch where your account is held. You can find this on your checks or by contacting your bank directly.
Can I use someone else's routing code to send them money?
Yes. When you send money to someone, you use their routing code and their account number. You do not use your own routing code for outgoing transfers — only for incoming ones. The routing code tells the system which bank to send the money to.
What if I cannot find my routing code?
Call your bank's customer service line or log into your online banking portal. Both can provide your routing code within minutes. You can also visit your bank's website — many banks publish routing codes for each branch in a searchable directory.
Do I need a routing code for transfers between my own accounts?
If both accounts are at the same bank, you usually do not need a routing code — you can transfer money through your online banking portal. If the accounts are at different banks, you will need the routing code of the bank where the receiving account is held.
Is a routing code the same as a bank code?
In the U.S., routing code and bank code are often used interchangeably, though technically a bank code is just one part of the routing code. Outside the U.S., "bank code" may refer to something different. Stick with "routing code" or "ABA number" when dealing with U.S. banks to avoid confusion.