When it comes to managing your money, understanding the numbers printed on your checks or shown in your online banking dashboard is essential. These numbers—routing numbers, account numbers, and sort codes—are the backbone of local and international money transfers. Whether you’re setting up direct deposit, transferring funds, or simply identifying your bank account details, knowing what these numbers are and where to find them is key.
In this guide, we’ll walk you through everything you need to know about routing numbers and account numbers in the U.S. and sort codes in the U.K., and help answer common questions like “how do I find my account number?” and “which number on a check is the account number?”
What Is a Routing Number?
A routing number, also known as an ABA routing number or routing transit number (RTN), is a 9-digit code used in the United States to identify financial institutions.
This number ensures that your money is sent to the right place when you’re transferring funds between banks, setting up direct deposits, or paying bills electronically.
Where can you find your routing number?
- On paper checks: it’s the first group of numbers on the bottom-left corner.
- In online banking: look under “Account Details” or “Direct Deposit Information.”
- On bank statements: usually listed alongside your account number.
When do you need a routing number?
- Setting up direct deposit with an employer
- Making ACH transfers (such as paying rent or bills)
- Transferring money between banks
- Receiving tax refunds
- Sending domestic wire transfers
Each U.S. bank may have multiple routing numbers depending on your account type or location, so it’s important to confirm you’re using the correct one.
What Is an Account Number?
Your account number is the unique identifier for your specific bank account. It tells the bank where to deposit or withdraw your money.
Where is the account number on a check?
- It’s the second group of numbers on the bottom of your check, immediately following the routing number.
- Most U.S. account numbers are between 8 and 12 digits long.
If you’re asking:
- “On a check, which number is the account number?”
- “Which one is the account number?”
- “How do I find my checking account number?”
→ Look at the middle set of digits on the bottom of your check.
Other ways to find it:
- Log in to your online banking account
- Check your bank statement
- Visit or call your bank branch
What’s the Difference Between Routing and Account Numbers?
| Feature | Routing Number | Account Number |
|---|---|---|
| Purpose | Identifies your bank | Identifies your specific account |
| Digits | 9 digits | 8–12 digits |
| Location on Check | Far left | Middle |
| Used for | Transfers, wires, direct deposits | Withdrawing, depositing, account-specific transactions |
You need both to send or receive money from your account. If one number is incorrect, the transaction could fail—or worse, go to the wrong person.
How to Find Routing and Account Numbers Without a Check
No checkbook? No problem.
You can find both numbers by:
- Logging into your online banking account and going to the “Account Info” or “Details” section
- Using your mobile banking app
- Calling your bank’s customer service line
- Looking at your monthly bank statement
- Visiting your local bank branch
Be sure to use the correct routing number for the type of transaction (ACH vs. wire transfers)—some banks use different routing numbers for each.
What About Sort Codes and Account Numbers in the U.K.?
In the United Kingdom, instead of routing numbers, banks use a combination of:
- Sort code: Identifies the bank and branch
- Account number: Identifies the individual account
What is a Sort Code?
A sort code is a 6-digit number in the format 12-34-56. It’s used for all domestic bank transactions within the U.K.
Sort codes identify:
- The bank
- The bank’s specific branch
- Where your account is held
You’ll need your sort code when:
- Receiving or sending payments within the U.K.
- Setting up direct debits or standing orders
- Providing your bank details to employers or clients
Where to find it:
- On your debit card (some banks print it there)
- In your mobile or online banking app
- On your bank statement
- On your checkbook, if issued
What is the Account Number in the U.K.?
U.K. account numbers are always 8 digits long and are unique to your personal or business bank account.
When someone asks for your U.K. bank details, they are typically requesting:
- Your sort code (6 digits)
- Your account number (8 digits)
Common Questions About Bank Numbers
Which one is the account number on a check?
The account number is the middle group of numbers at the bottom of your check, directly after the 9-digit routing number.
How many digits is a routing number?
In the U.S., all routing numbers are exactly 9 digits.
How many digits is an account number?
- U.S. account numbers: Usually 8–12 digits
- U.K. account numbers: Always 8 digits
Is it safe to give out my routing and account number?
Generally, yes. Sharing your routing and account number is safe when used for intended financial purposes, such as setting up direct deposit, receiving payments, or paying bills. However, never share these details with unknown or untrusted parties to avoid fraud or unauthorized withdrawals.
U.S. vs. U.K. Bank Numbers: Quick Comparison
| Feature | U.S. Banking | U.K. Banking |
|---|---|---|
| Bank Identifier | Routing Number (9 digits) | Sort Code (6 digits) |
| Account Number Length | 8–12 digits | 8 digits |
| International Transfer Code | SWIFT / BIC | SWIFT / BIC + IBAN |
| Domestic Transfers | Routing + Account Number | Sort Code + Account Number |
IBAN, SWIFT, and International Transfers
If you’re sending or receiving money internationally, you’ll often need additional information:
- IBAN (International Bank Account Number): Common in Europe, includes your country code, sort code, and account number.
- SWIFT/BIC Code: Identifies your bank internationally.
The U.S. does not use IBANs, but you will need:
- SWIFT code
- ABA routing number (for some transfers)
- Account number
Always double-check what format is needed for the specific country and transaction type.
What Happens If You Enter the Wrong Routing or Account Number?
Entering an incorrect routing or account number can result in:
- Failed payments
- Delays in transfers
- Money going to the wrong person or bank
- Possible fees from your bank
If you make a mistake:
- Contact your bank immediately
- Confirm if the funds can be recalled
- Verify all future transfers carefully
Practical Use Cases: Why These Numbers Matter
Setting Up Direct Deposit
To get your salary or government benefits deposited directly, you’ll need to provide:
- Routing number (U.S.) or sort code (U.K.)
- Account number
- Bank name
Paying Bills
ACH transfers, online bill pay, and automatic payments all require these identifiers to pull money from your account securely.
Transferring Between Accounts
Want to move money between a checking and savings account? Routing and account numbers allow internal and external transfers.
International Wire Transfers
When sending money abroad, be prepared to provide:
- Your bank’s SWIFT/BIC code
- Your account number
- Sort code or routing number
- IBAN (if outside the U.S.)
How to Update Your Routing or Account Numbers
If you switch banks or close an account:
- Inform your employer, utility companies, or clients immediately
- Update all direct deposit and auto-payment instructions
- Double-check all saved information in apps or payment platforms
Failure to do this could result in missed payments or delays.
Final Thoughts
Understanding how routing numbers, account numbers, and sort codes work is essential for safe and smooth banking—especially in a world where digital payments, direct deposits, and online transfers are standard practice.
Whether you’re trying to figure out the account number on a check or differentiate between a U.K. sort code and a U.S. routing number, this knowledge empowers you to manage your finances with confidence.
Always double-check the details before you send or receive money—and when in doubt, contact your bank for confirmation.
