Your checking account has two main numbers: the routing number and the account number
A checking account uses two separate numbers to identify where your money is and which account it belongs to. The routing number identifies your bank or credit union — it's the same for every customer at that institution. The account number is unique to you and distinguishes your account from every other account at that same bank.
Together, these two numbers tell the banking system exactly where to send money when someone pays you, where to pull money from when you write a check, and where to direct automatic payments or transfers. You'll need both numbers for direct deposit, wire transfers, setting up bill pay, and giving payment instructions to employers or other organizations.
Some banks also print a check number on each physical check you write, but that's a separate identifier used to track individual checks — not part of your core account identification.
Key Takeaways
- Your routing number (nine digits) identifies your specific bank or credit union and is the same for all customers there.
- Your account number (typically 8 to 17 digits, depending on your bank) is unique to your account and no one else has it.
- You need both numbers together for direct deposit, wire transfers, and automatic bill payments to work correctly.
- Your routing number appears on the bottom left of checks, and your account number appears in the middle, followed by the check number on the right.
- If you switch banks, your routing number changes but your account number stays the same at your new bank.
Where to find your routing number
The routing number is printed on the bottom left corner of every check you receive from your bank. It's always nine digits long. If you don't have checks handy, you can find it on your bank's website — most banks list it in the FAQ section or under account information. You can also call your bank's customer service line and ask; they'll give it to you immediately.
The Federal Reserve maintains a complete database of routing numbers by bank. If you know your bank's name but not the routing number, you can search for it at fedachdirectory.frb.org or ask your bank directly. Some banks have multiple routing numbers for different regions or account types, so make sure you're using the one that matches your specific branch or account.
Where to find your account number
Your account number appears on the bottom middle section of every check, right after the routing number. It's typically 8 to 17 digits long depending on your bank — there's no standard length across all banks. You can also find it on your bank statements, in your online banking portal, or by calling customer service.
Your account number is confidential information, similar to a password. Don't share it with people you don't trust, and be cautious about typing it into websites unless you're certain they're legitimate. If you suspect someone has your account number, contact your bank immediately.
How banks use these numbers in practice
When your employer sets up direct deposit, they ask for both your routing number and account number. The routing number tells the payroll system which bank to send the money to; the account number tells that bank which of its thousands of accounts should receive the deposit. Without both numbers, the payment either goes to the wrong bank or gets rejected.
The same logic applies to bill pay, wire transfers, and ACH transfers (the system most banks use for electronic money movement). If you give someone only your account number without the routing number, they won't be able to send you money. If you give them the wrong routing number, your money might end up at a different bank entirely, which creates delays while the banks sort it out.
Check numbers, by contrast, are used only for tracking purposes. When you write a check, the check number helps you and your bank identify which specific check you're referring to if there's a question about whether it cleared. The check number doesn't affect where the money goes — the routing and account numbers on the check do that.
What happens if you give out the wrong number
If you accidentally give someone your routing number instead of your account number, they won't be able to complete a transfer to you. The system will reject it because the routing number alone doesn't point to a specific account. They'll need to ask you for the account number and try again.
If you give the wrong account number but the correct routing number, the money might go to someone else's account at your bank, or the transfer might fail if the account number doesn't exist. Either way, the sending bank will eventually catch the error and return the money to the sender, but this can take several days. Always double-check both numbers before confirming a transfer.
International transfers and SWIFT codes
If someone outside the United States is sending you money, they may ask for a SWIFT code instead of a routing number. A SWIFT code is an international identifier for banks, similar to a routing number but used for cross-border transfers. Your bank can provide your SWIFT code if you ask — it's usually different from your routing number.
For international transfers, you typically need your SWIFT code, your account number, and sometimes your full name and address. The process is slower than domestic transfers and may involve fees from both your bank and the sending bank. Ask your bank what information the sender will need before you provide it.
Frequently Asked Questions
Can someone withdraw money from my account if they only have my account number?
They would need both your routing number and account number to set up a transfer or automatic payment. However, if they have both numbers, they could potentially set up an ACH debit without your permission. This is why you should treat your account number like sensitive financial information and only share it with people and organizations you trust.
Do I need to memorize my routing and account numbers?
No. You can look them up anytime on your checks, bank statements, or online banking portal. Most people keep a record of both numbers in a safe place rather than memorizing them. You only need them when setting up direct deposit, bill pay, or transfers.
What if my bank merges with another bank?
Your account number usually stays the same, but your routing number may change because you now have a different bank. Your bank will notify you of any routing number changes and update your account information. If you have automatic payments set up, you may need to update them with the new routing number, though many banks handle this automatically.
Are routing numbers the same for online banks?
Yes. Online banks and credit unions have routing numbers just like traditional banks. You can find an online bank's routing number the same way — on their website, in your account information, or by calling customer service. The routing number works the same way regardless of whether the bank has physical branches.
What's the difference between a routing number and a transit number?
A transit number is the Canadian equivalent of a routing number. If you're sending money to Canada, you'll need the recipient's transit number instead of a routing number. U.S. banks use routing numbers; Canadian banks use transit numbers. They serve the same purpose but are specific to their country's banking system.