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 a routing transit number or ABA number. When you send money to someone else's account, write a check, or set up a direct deposit, that nine-digit code is how the banking system knows which bank to send the money to. Without it, your payment could go nowhere or to the wrong place.
The routing number is not secret. It appears on the bottom left of every check you write, and you can find it on your bank's website or by calling customer service. It is different from your account number, which identifies your specific account at that bank. Together, the routing number and account number tell the system: "Send this money to this specific account at this specific bank."
Key Takeaways
- A routing number is a nine-digit code that identifies your bank, not your individual account.
- You will need your routing number to set up direct deposit, receive wire transfers, or authorize automatic payments.
- The routing number appears on the bottom left of your checks and on your bank's website.
- Different branches of the same bank usually share one routing number, so location does not matter.
- Giving out your routing number is safe—it is public information and cannot be used to withdraw money without your account number.
Where the routing number appears and how to find it
If you have checks, look at the bottom left corner. You will see three groups of numbers. The first group—nine digits—is your routing number. The second group is your account number. The third is the check number.
If you do not have checks or cannot find them, 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.
Some banks have different routing numbers for different types of transactions (wire transfers versus ACH transfers, for example), so if you are setting up a specific payment method, ask your bank which routing number to use.
Why banks use routing numbers instead of just account numbers
The banking system processes millions of transactions every day. A routing number acts like a postal address for your bank—it directs the money to the right institution first, then the account number directs it to the right person within that institution. Without routing numbers, the system would have to look up every account individually, which would be slow and error-prone.
Routing numbers also make it possible for banks to communicate with each other. When you deposit a check from another bank, or when your employer sends your paycheck to your account, the routing number is what allows those different banking systems to find each other and complete the transaction.
What you need to know about sharing your routing number
Your routing number is public information. You can safely give it out to employers, creditors, or anyone who needs to send you money. It cannot be used to withdraw funds from your account or to steal money—a thief would also need your account number, and even then, most banks require additional verification before processing a transfer.
That said, you should never share your full account number with someone you do not trust, and you should never give out your routing number to someone who contacts you unexpectedly claiming to be from your bank. Legitimate banks will never ask you to confirm your routing number over the phone or email.
Routing numbers and different types of payments
Direct deposit uses your routing number and account number to deposit paychecks or government payments directly into your account. Automatic bill payments use the same information to pull money from your account on a schedule. Wire transfers use your routing number to send money to another bank, usually within one business day.
ACH transfers—the system used for most online payments and transfers between banks—also use your routing number. When you send money through your bank's website to another person's account, or when you pay a bill online, the routing number is working behind the scenes to route that money correctly.
What happens if you use the wrong routing number
If you provide the wrong routing number, the money will go to the wrong bank. Depending on the type of transaction, the receiving bank may reject it and send it back to the sender, or it may sit in a suspense account while the bank tries to figure out where it belongs. This can take days or weeks to resolve.
If you realize you used the wrong routing number, contact your bank when ready. They can sometimes stop the transaction if it has not yet been processed. If the money has already left your account, your bank can file a trace to track where it went and work with the other bank to recover it, though this process takes time and is not always successful.
Routing numbers for different types of accounts and institutions
Most checking and savings accounts at the same bank share the same routing number, regardless of which branch you use or what state you live in. Some large banks have multiple routing numbers based on the region or the type of account, but this is less common.
Credit unions and online banks also have routing numbers. If you bank with a credit union, you can find your routing number the same way—on your checks, on the credit union's website, or by calling. Online banks display routing numbers in your account settings or on their website's FAQ page.
Frequently Asked Questions
Can someone steal money from my account if they have my routing number?
No. A routing number alone cannot be used to withdraw money. A thief would also need your account number, and even with both pieces of information, most banks require additional verification—like a PIN or security question—before processing a transfer. Your routing number is safe to share.
Do I need a different routing number for wire transfers versus ACH transfers?
Some banks use different routing numbers for wire transfers and ACH transfers. Before you set up either type of transfer, ask your bank which routing number to use. Using the wrong one will delay or reject the transaction.
What if my bank merged with another bank—does my routing number change?
Usually not when ready. After a merger, your bank may assign you a new routing number, but they typically honor the old one for a period of time to avoid disrupting existing payments. Your bank will notify you if your routing number is changing and when the change takes effect.
Is my routing number the same as my bank's main routing number?
In most cases, yes. Your personal routing number is the same as your bank's main routing number. However, some large banks have multiple routing numbers for different regions or account types, so confirm with your bank if you are unsure.
Where do I find my routing number if I bank online and do not have checks?
Log into your online banking account and look for account details, account information, or settings. Most online banks display the routing number prominently. If you cannot find it, call customer service or check the bank's website—they usually have a page listing routing numbers by state or region.