A checking account has three separate number sequences you need to know
Your checking account uses three different sets of numbers, and they do different jobs. The routing number identifies your bank. The account number identifies your specific account at that bank. The check number identifies each individual check you write. When you set up direct deposit, pay a bill online, or receive a wire transfer, the routing number and account number work together to make sure the money lands in the right place.
You will see all three on the bottom left of a paper check. The routing number comes first (nine digits), then the account number (usually 10 to 12 digits), then the check number (three to four digits). Online banking platforms show your routing and account numbers in the settings or account information section. You do not need to memorize them, but you do need to know where to find them.
Key Takeaways
- Your routing number (nine digits) identifies your specific bank branch and never changes for that institution.
- Your account number (10 to 12 digits) identifies your individual account and is unique to you at that bank.
- Your check number (three to four digits) identifies each check you write and increments with each new check.
- You need both routing and account numbers together for direct deposit, wire transfers, and bill payments.
- The bottom of a paper check displays all three numbers in order: routing, account, then check number.
Where to find your routing number
The routing number is the first nine digits printed on the left side of the bottom of any check. It is also called the ABA routing number or transit number. This number belongs to your bank, not to you — every customer at the same bank branch has the same routing number.
If you do not have checks, you can find your routing number on your bank's website, usually in the account settings or "bank details" section. You can also call your bank's customer service line and ask. Some banks print it on statements or in the welcome materials they send when you open the account. Online banks and credit unions have routing numbers too, even though they do not issue paper checks.
Where to find your account number
Your account number appears on the bottom of checks, right after the routing number. It is usually 10 to 12 digits long, though the length varies by bank. This number is unique to your account — no other customer at your bank has the same account number.
You can find your account number in online banking by logging in and looking at your account information or settings. It also appears on your bank statements, usually at the top or in the account details section. If you lose a statement and cannot access online banking, call your bank and they will read it to you over the phone. Write it down somewhere safe but not in your wallet next to your debit card.
What the check number does
The check number is the smallest sequence on the bottom of a check — usually three or four digits. It identifies that specific check. When you write check number 1001, the next check you write is numbered 1002, and so on. Banks use check numbers to track which checks have cleared and which are still outstanding.
If you order new checks, they will continue the numbering sequence from your previous order. If you lose a check or need to cancel one, you can reference it by its check number when you call your bank. Online banking platforms often show you which checks have cleared and which are pending, organized by check number.
Why you need both routing and account numbers together
The routing number tells the banking system which bank to send money to. The account number tells that bank which account within the bank to deposit it into. Without both numbers, the transfer cannot happen. This is why direct deposit forms, bill payment setups, and wire transfer requests all ask for both numbers.
If you give someone only your account number, they cannot send you money because the system will not know which bank to contact. If you give only the routing number, the bank will not know which account to credit. Banks use the combination of routing and account number as a unique address for your money.
How these numbers appear on different documents
| Document Type | Routing Number | Account Number | Check Number |
|---|---|---|---|
| Paper check | Bottom left, first 9 digits | Bottom left, after routing number | Bottom left, after account number |
| Bank statement | Usually in account details section | Usually at top or in details | Not typically shown |
| Online banking | Account settings or bank details | Account settings or overview | Not typically shown |
| Welcome letter | Sometimes included | Sometimes included | Not typically shown |
What to do if you cannot find your numbers
If you do not have checks and cannot access online banking, call your bank's customer service number. Have your Social Security number, date of birth, and a form of ID ready. The bank will verify your identity and read both your routing and account numbers to you over the phone. This takes about five minutes.
If you are setting up direct deposit at work or paying a bill online and need these numbers right now, the fastest route is usually your bank's website. Log in, go to account settings, and look for a section labeled "account information," "bank details," or "routing number." If your bank's website is down or you cannot remember your login, the phone call is your backup.
Frequently Asked Questions
Do I need to memorize my routing and account numbers?
No. Write them down and keep the paper in a safe place at home, or take a photo of a check and store it securely. You only need to look them up when you are setting up direct deposit, making a wire transfer, or paying a bill. Most people look them up a few times a year at most.
Can my account number change?
Rarely. Your account number stays the same for as long as you have the account, even if you move, change jobs, or the bank merges with another bank. If your account number does change, the bank will notify you in writing and provide the new number.
Is it safe to give out my routing and account numbers?
Yes, for legitimate purposes. Your routing number is public — it is printed on every check. Your account number is semi-private. Give both only to your employer for direct deposit, to your bank for bill payments, or to trusted organizations like your mortgage lender. Never give them to someone who calls you unsolicited or emails you asking to "verify" your account.
What if I write a check with the wrong account number?
The check will bounce or be rejected because the routing and account number combination will not match any real account. The person who receives the check will not be able to deposit it. Call your bank immediately if you realize you wrote a check with incorrect numbers, and ask them to help you cancel it and issue a replacement.
Do online banks have routing numbers?
Yes. Even though online banks do not have physical branches, they still have routing numbers for direct deposits and wire transfers. You can find your online bank's routing number on their website or by calling their customer service line. It works the same way as a traditional bank's routing number.