A routing number is a nine-digit code that tells the banking system which bank holds your account
Think of a routing number as your bank's address in the financial system. When money moves from one bank to another — whether you're setting up direct deposit, paying a bill online, or sending a wire transfer — the routing number tells the sending bank exactly where to send that money. Without it, the system wouldn't know which of thousands of banks across the country should receive the funds.
Every bank in the United States has its own routing number. Some large banks have multiple routing numbers, one for each region or type of transaction. The number itself is assigned by the American Bankers Association, a trade group that manages this system. You'll also hear routing numbers called "ABA numbers" or "transit numbers" — they're the same thing.
Your routing number is not secret. Banks print it on checks, display it on their websites, and you can call and ask for it. It's safe to share because it only tells someone which bank you use — it doesn't give them access to your money the way an account number or PIN would.
Key Takeaways
- A routing number is a nine-digit code specific to your bank that directs money to the correct financial institution.
- You need your routing number whenever you set up direct deposit, make an online bill payment, or arrange a wire transfer.
- Your routing number appears on the bottom left of your checks and on your bank's website.
- It is safe to share your routing number because it only identifies your bank, not your account or funds.
Where to find your routing number
The easiest place to look is the bottom left corner of any check you have. The first set of nine digits printed there is your routing number. The next set of digits is your account number.
If you don't 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 — they'll give you the number over the phone in under a minute.
If you're not sure which number is which, remember: routing number comes first (nine digits), account number comes second (usually ten to twelve digits). Your bank's website or a quick call will confirm if you're uncertain.
When you'll need to provide your routing number
Direct deposit is the most common reason. When you start a new job or sign up for government benefits, you'll be asked for your routing number and account number so your employer or the government agency can deposit money directly into your account.
Online bill payments also require it. If you pay a utility bill, rent, or loan through your bank's website or app, the system uses your routing number to route the payment to the correct bank. Some billers ask for it directly when you set up automatic payments.
Wire transfers need both numbers. If someone is sending you money through a wire transfer — a faster but less common method than direct deposit — they'll need your routing number and account number to complete it. Incoming wire transfers sometimes require additional information like your bank's wire transfer address, which differs from the mailing address.
ACH transfers, which are slower and cheaper than wires, also use your routing number. ACH is the system behind most direct deposits and online bill payments.
Routing numbers vary by bank and sometimes by location
Each bank has at least one routing number. Large national banks like Chase, Bank of America, and Wells Fargo may have different routing numbers for different regions or different types of transactions. If you move to a different state or switch branches, your routing number might stay the same — but it's worth checking.
Credit unions also have routing numbers. If you bank at a credit union, the process is identical: find the nine-digit number on your checks or on the credit union's website, and use it the same way you would for a traditional bank.
Online banks have routing numbers too, even though they don't have physical branches. They're assigned the same way and work identically in the financial system.
What happens if you use the wrong routing number
If you provide an incorrect routing number, the money usually doesn't reach your account. Instead, it goes to the wrong bank. Most of the time, that bank will reject the transfer and send it back to the sender, which can take several days or weeks.
In rare cases, money sent to the wrong routing number might end up in someone else's account at that bank. This is why it's worth double-checking before you submit. Copy the number directly from your checks or your bank's website rather than typing it from memory.
If you've already sent money with the wrong routing number, contact your bank when ready. They can sometimes trace where the money went and help retrieve it, but the faster you report it, the better your chances.
The difference between routing number and account number
Your routing number identifies your bank. Your account number identifies your specific account within that bank. You need both for most transactions.
Think of it this way: the routing number is like the address of a post office, and your account number is like your mailbox number inside that post office. The routing number gets the money to the right bank; the account number gets it to the right account once it arrives.
On a check, the routing number appears first (nine digits on the left), followed by your account number (usually ten to twelve digits in the middle). Some transactions ask for them separately; others ask for both together.
Frequently Asked Questions
Is it safe to give someone my routing number?
Yes. Your routing number only identifies which bank you use — it doesn't give anyone access to your money. Never share your account number, PIN, or online banking password, but your routing number is safe to provide to employers, billers, and people sending you money.
Do I need a different routing number for each account I have?
No. If you have a checking account and a savings account at the same bank, they share the same routing number. The account number is what distinguishes between them. You only need one routing number per bank.
What if my bank merged with another bank?
Your routing number may change after a merger. Contact your bank to confirm whether your routing number is still the same. If it changed, update any automatic payments or direct deposits you have set up with the new number.
Can I find someone's bank from their routing number?
Yes, but only the bank name — not the person or their account details. If you have a routing number and want to know which bank it belongs to, you can search the Federal Reserve's routing number database online. This is public information.
Do international wire transfers use routing numbers?
No. International transfers use a different system called SWIFT codes or IBAN numbers, depending on the country. Routing numbers only work within the United States banking system.