A routing number tells the banking system which bank to send your money to
A routing number is a nine-digit code that identifies your specific bank or credit union within the U.S. banking system. When you send money to someone else's account—whether by wire transfer, direct deposit, or ACH payment—the routing number tells the payment system which institution holds that account. Without it, the money has no address.
Think of it like a postal code for banks. Your account number identifies which account within that bank, but the routing number identifies the bank itself. The two work together: routing number + account number = a complete destination for funds.
Every bank and credit union has its own routing number, and some large institutions have multiple routing numbers for different regions or divisions. The number is assigned by the American Bankers Association and registered with the Federal Reserve.
Key Takeaways
- A routing number is a nine-digit code specific to your bank or credit union, used to direct payments to the correct institution.
- You need your routing number whenever you set up direct deposit, make a wire transfer, or authorize an ACH payment from your account.
- Your routing number appears on the bottom left of your checks, and you can also find it through your bank's website or by calling customer service.
- The routing number stays the same for your bank; your account number is what changes if you open a new account.
Where to find your routing number
The easiest place to find your routing number is the bottom left corner of any check you have. The first nine digits printed there are your routing number; the next set of digits is your account number.
If you do not have checks, log into your bank's website or mobile app. Most banks display the routing number in the account details section, often labeled "Routing Number," "ABA Number," or "Transit Number." You can also call your bank's customer service line and ask for your routing number—they will give it to you when ready.
Credit unions use routing numbers the same way banks do. If you are unsure whether your institution is a bank or credit union, the routing number works the same either way.
Why banks use routing numbers instead of just account numbers
The U.S. banking system processes hundreds of millions of transactions daily. Routing numbers create a standardized way to sort payments by institution before they reach individual banks. Without them, every payment would have to be manually matched to the correct bank, which would slow everything down and create more errors.
When you send money, it typically moves through at least two banks: yours (the sending bank) and the recipient's (the receiving bank). The routing number tells the payment network which receiving bank to contact. The receiving bank then uses your account number to deposit the money into the right account within that bank.
Routing numbers for wire transfers, direct deposits, and ACH payments
You will need your routing number for three common payment types. For wire transfers, you provide your routing number along with your account number so the sending bank knows exactly where to send the funds. Wire transfers are typically faster and more expensive than other methods.
For direct deposit (like paychecks or tax refunds), your employer or the government agency needs your routing number and account number to deposit money directly into your account instead of sending a check. This is the most common use of routing numbers for most people.
ACH payments are electronic transfers between accounts that take one to three business days. If you set up automatic bill payments or send money to a friend through your bank's transfer service, you are using ACH, and you will need to provide the recipient's routing number and account number.
What happens if you give the wrong routing number
If you provide an incorrect routing number, the payment may be rejected before it leaves your bank, or it may be sent to the wrong institution. If it reaches the wrong bank, that bank will typically reject it and send it back to your bank, which then returns it to you. This process usually takes three to five business days.
If the wrong routing number happens to belong to a real bank but the account number does not exist at that bank, the receiving bank will reject the transaction and it will bounce back. You will not lose the money—it will return to your account—but the delay means the payment arrives late.
Always double-check the routing number before you submit a payment, especially for wire transfers, which are harder to reverse once sent.
Routing numbers are public information
Your routing number is not secret. It appears on every check you write, and banks publish routing numbers publicly so people can send you money. Sharing your routing number alone does not put your account at risk—someone would also need your account number to access your funds, and even then, they cannot withdraw money without authorization from your bank.
Your account number is more sensitive than your routing number. If someone has both your routing number and account number, they could potentially set up unauthorized ACH payments from your account. If this happens, contact your bank when ready to report the fraud and dispute the transaction.
Routing numbers for different types of institutions
Banks, credit unions, and some online-only institutions all have routing numbers. Credit unions often use the term "routing number" and "transit number" interchangeably. Online banks have routing numbers just like traditional banks, even though they do not have physical branches.
If you have accounts at multiple banks or credit unions, each institution has its own routing number. You cannot use one bank's routing number for another bank's account. If you move your account to a different bank, your new account will have a different routing number.
Frequently Asked Questions
Can I use the same routing number for all my accounts at the same bank?
Yes. If you have multiple accounts at the same bank—a checking account and a savings account, for example—they share the same routing number. The account number is what distinguishes between them.
Do I need a routing number to receive money?
Yes. Anyone sending you money needs your routing number and account number. If they are sending a wire transfer or setting up direct deposit, they will ask for both numbers.
What is the difference between a routing number and a SWIFT code?
A routing number works within the U.S. banking system. A SWIFT code is used for international wire transfers and identifies banks outside the United States. If you are sending money to another country, you will need the recipient's SWIFT code instead of a routing number.
Does my routing number change if I move to a different state?
Not usually. Your routing number is tied to your bank or credit union, not your location. If you move but keep your account at the same bank, your routing number stays the same. If you close your account and open a new one at a different bank, you will have a new routing number.
Can I find someone's routing number if I only know their name?
No. Routing numbers are tied to banks, not to individual people. You would need to know which bank the person uses, and then you could find that bank's routing number. The person themselves would need to tell you their account number.