The routing number is the nine-digit code at the bottom left of your check, printed between two colons
When you look at the bottom of a check, you will see three groups of numbers separated by colons or special symbols. The first group — always nine digits — is your bank's routing number, also called the routing transit number or ABA number. It identifies which bank or credit union issued the check. The second group is your account number. The third is the check number itself.
The routing number tells the Federal Reserve and other banks where to send the money when someone deposits or cashes your check. Every bank and credit union has its own routing number, even if they are part of the same larger institution. A bank with branches in multiple states may have different routing numbers for different regions or different types of accounts.
You need this number when you set up direct deposit, arrange automatic bill payments, or receive a wire transfer. It is also what you provide when someone asks for your "bank routing number" — not your account number, not your bank's phone number, just those nine digits.
Key Takeaways
- The routing number is the first nine-digit code at the bottom left of your check, printed between colons or special symbols.
- This number identifies your specific bank or credit union and tells other financial institutions where to send money.
- Different branches or account types at the same bank may have different routing numbers, so always check your own checks rather than assuming.
- You will need this number for direct deposit, wire transfers, and automatic payments, but it is not secret — it appears on every check you write.
How the routing number appears on different check formats
Most checks follow the same layout: three groups of numbers at the bottom in what is called MICR format (Magnetic Ink Character Recognition). The routing number comes first on the left, followed by your account number, then the check number on the right. The numbers are printed in a special magnetic ink that machines can read automatically.
Some checks use colons to separate the groups (like 121000248:987654321:1001), while others use special symbols that look like brackets or boxes. The format varies slightly between banks, but the position is always the same: routing number first, on the far left, nine digits long.
If your check is damaged or the numbers are faded, you can still find your routing number by contacting your bank directly or visiting your bank's website. Most banks list their routing number on their website under account information or customer service. You can also call the number on the back of your debit card.
Why banks use routing numbers instead of just the bank name
A routing number is faster and more reliable than a bank name because it is a standardized code that every financial institution recognizes. When you write a check, the routing number tells the processing system exactly which bank holds your account — not just "Bank of America" but the specific Bank of America branch or processing center that handles your account.
The routing number system dates back to the American Bankers Association in 1910, long before computers existed. Banks needed a way to sort checks by hand, so they assigned each bank a unique number. That system is still in use today because it works: machines can read the numbers faster and more accurately than they can read bank names, and the number never changes even if the bank is bought, renamed, or reorganized.
What happens if you use the wrong routing number
If you provide the wrong routing number, the money will go to the wrong bank. The sending bank will eventually catch the error and try to return the funds, but this can take several days or even weeks. During that time, the money is stuck in limbo and you cannot access it.
For example, if you set up direct deposit with your employer but give them a routing number for a different bank, your paycheck will be deposited into an account you do not own or monitor. The receiving bank will eventually reject it, but your employer may not reissue the check when ready — they may wait until the next pay period or until you contact them to fix the problem.
For one-time payments like wire transfers, a wrong routing number is caught almost when ready because the receiving bank verifies the account before accepting the transfer. For recurring payments like direct deposit or automatic bill pay, the error might not show up until the first payment is processed.
Routing numbers for different account types at the same bank
A single bank may have multiple routing numbers depending on the type of account or the region where the account was opened. For example, a bank might have one routing number for checking accounts opened in New York and a different one for checking accounts opened in California. A savings account at the same bank might use yet another routing number.
This happens because banks often acquire other banks and keep their separate routing numbers for years, or because they organize their processing centers by region. The safest approach is to always check the routing number on your own check rather than asking someone else or looking it up online — the number printed on your check is the correct one for your specific account.
If you have multiple accounts at the same bank, each account may have its own routing number. Check the bottom of the checks for each account to confirm.
How to verify your routing number is correct
The easiest way to verify your routing number is to look at a check you have already written. The nine-digit code on the left is correct for your account. You can also log into your online banking and look for account details or settings — most banks display the routing number there.
If you do not have a check or online access, call your bank's customer service number (on the back of your debit card or on your bank statement) and ask for your routing number. Have your account number ready. You can also visit your bank's website and search for "routing number" — most banks have a page that lists routing numbers by branch or account type.
When you find the number, write it down and keep it somewhere safe. You will use it repeatedly for direct deposit, bill payments, and transfers.
Frequently Asked Questions
Is the routing number the same as the SWIFT code?
No. A routing number is used for domestic transfers within the United States. A SWIFT code (also called a BIC code) is used for international wire transfers. Your bank has both, but they are different codes. If you are sending money to another country, ask your bank for the SWIFT code, not the routing number.
Can someone use my routing number to steal money from my account?
Not with just the routing number alone. They would also need your account number, and even then they cannot withdraw money directly — they can only set up transfers or payments that you would see on your statement. Your routing number is printed on every check you write, so it is not secret. The account number is what you need to protect.
Do I need a routing number to receive a check payment?
No. The person writing the check needs to know their own routing number (which is on their check), not yours. You only need to provide your routing number and account number when you are receiving money via direct deposit, wire transfer, or automatic payment — not when you are receiving a paper check.
What if my bank merged with another bank?
Your routing number may or may not change depending on how the merger was structured. Check a recent check or log into online banking to see your current routing number. If you are unsure, call your bank and confirm. Do not assume your old routing number is still correct.
Can I find someone else's routing number from their check?
Yes, but it is not useful for most purposes. You would need both their routing number and account number to send them money, and even then you should confirm the account details directly with them rather than relying on a check. If someone gives you a check to deposit, the routing number on that check is already being used to process it.