Your ABA routing number is a nine-digit code that tells the banking system which bank holds your account
Think of it this way: when money moves between banks — whether a paycheck lands in your account or you send money to someone at a different bank — the banking system needs to know exactly where that money is going. Your ABA routing number is the address. It identifies your specific bank or credit union to every other financial institution in the country.
ABA stands for American Bankers Association, the organization that originally created and assigned these numbers. Every bank and credit union in the United States has at least one routing number. Some large banks have several, depending on where the account was opened or which branch handles it.
You will see your routing number on the bottom left of your checks, but you do not need a checkbook to find it — your bank can tell you over the phone, through their website, or in your account statements.
Key Takeaways
- Your ABA routing number is a nine-digit code that identifies which bank or credit union holds your account.
- The routing number appears on the bottom left of your checks, right before your account number.
- You need your routing number whenever money moves between different banks — for direct deposit, wire transfers, or automatic bill payments.
- You can find your routing number on your checks, your bank's website, by calling customer service, or in your account statements.
- The routing number is public information and safe to share; it only works with your account number to move money.
Where to find your routing number
The easiest place to look is the bottom left corner of any check you have. You will see three groups of numbers: the routing number (nine digits), then your account number, then the check number on the right.
If you do not have checks, log into your bank's website or mobile app and look for account details or account information. Most banks display the routing number there. You can also call your bank's customer service line — they can read it to you in under a minute. Some banks print it on statements as well, though not all do.
If you are not sure which routing number to use because your bank has more than one, ask your bank directly. They will tell you which one applies to your specific account.
Why you need it for direct deposit and transfers
When your employer sets up direct deposit to pay you, they ask for your routing number and account number. The routing number tells their bank where to send the money — to your bank. Your account number tells your bank which account within that bank receives it. Without the routing number, the money would not know which bank to go to.
The same thing happens when you set up automatic bill payments, transfer money to someone at another bank, or receive a wire transfer. The routing number is the routing address for your money.
Some payments stay within the same bank — if you transfer money between two accounts you both own at the same bank, for example — and those do not always require a routing number. But any time money crosses from one bank to another, the routing number is part of what makes it work.
The difference between routing number and account number
Your routing number identifies your bank. Your account number identifies your specific account within that bank. Think of the routing number as the bank's address and the account number as your mailbox number at that address.
Both numbers are needed together to move money to you. If someone has only your routing number, they cannot access your account — they know which bank you use, but not which account is yours. If someone has only your account number, the money cannot find its way to your bank at all.
This is why it is safe to share your routing number. It is public information. The account number is what you guard more carefully, though in practice most people share both when they need to receive money.
Routing numbers for wire transfers and ACH payments
Wire transfers and ACH payments (Automated Clearing House payments) both use routing numbers, but they sometimes use different ones. ACH is the system that handles direct deposit, automatic bill payments, and most online transfers between banks. Wire transfers are faster but more expensive and are usually used for larger amounts or time-sensitive payments.
Most banks use the same routing number for both, but some do not. If you are setting up a wire transfer or an ACH payment and your bank asks for a routing number, ask them which one to use — do not guess. Using the wrong routing number will delay the payment or send it to the wrong place.
What happens if you use the wrong routing number
If you give the wrong routing number, the money will go to the wrong bank. That bank will eventually figure out the mistake and send it back, but this takes time — usually several business days. During that time, your money is stuck in transit.
If the account number is also wrong, the receiving bank may hold the money longer while they try to figure out where it belongs. Always double-check both numbers before you confirm a transfer, especially for large amounts or time-sensitive payments.
If money goes to the wrong place, contact your bank right away. They can sometimes stop the transfer if it has not cleared yet, or they can help you trace it and ask the other bank to return it.
Routing numbers for credit unions and online banks
Credit unions have routing numbers just like traditional banks do. If you have an account at a credit union, you can find your routing number the same way — on checks, through their website, or by calling them.
Online banks and online-only accounts also have routing numbers. Even though you cannot walk into a physical branch, the money still has to move through the banking system the same way, so the routing number works the same way too.
Frequently Asked Questions
Is it safe to give someone my routing number?
Yes. Your routing number is public information — it identifies your bank, not your account. Someone with only your routing number cannot access your money. They need both your routing number and your account number to move money to or from your account, and even then, they can only do what you authorize.
Do I need a different routing number for each account I have?
Usually not. Most people have one routing number for their bank, even if they have multiple accounts there — checking, savings, money market, and so on. Your account number is what distinguishes between them. However, some banks assign different routing numbers based on when or where the account was opened, so if you are unsure, ask your bank.
What if my bank merged with another bank?
Your routing number may change after a merger. Your bank will notify you and update your account information. If you have direct deposit or automatic payments set up, contact your employer or the companies you pay to give them the new routing number. Your old routing number may still work temporarily, but using the new one prevents delays.
Can I use my routing number to look up which bank someone uses?
Yes, in a general way. The Federal Reserve maintains a database of routing numbers, and you can search it online to see which bank a routing number belongs to. This is public information and is sometimes useful if you receive a transfer and want to confirm which bank it came from.
Do international banks have ABA routing numbers?
No. ABA routing numbers are only for banks in the United States. International transfers use a different system called SWIFT codes. If you are sending money to or receiving money from outside the US, you will need a SWIFT code instead of a routing number.