What Is a Routing Number? How to Find Yours and What It’s Used For
Last updated 04/10/2026 by
Ante Mazalin
Edited by
Andrew Latham
Summary:
A routing number (also called an ABA routing number or routing transit number) is a unique 9-digit code assigned to a U.S. financial institution by the American Bankers Association that identifies the bank in electronic financial transactions — including direct deposit, ACH transfers, wire transfers, and paper check processing.
Routing numbers serve several distinct functions depending on where they appear.
- ACH transactions: Routing numbers are required to initiate or receive ACH transfers — including direct deposit of paychecks, automatic bill payments, and bank-to-bank transfers. The ACH routing number is often different from the wire transfer routing number at the same bank.
- Wire transfers: Domestic wire transfers use the bank’s ABA routing number. International wire transfers use a SWIFT/BIC code instead of (or in addition to) the routing number.
- Paper checks: The routing number appears as the first 9 digits in the MICR line at the bottom left of every check, followed by the account number and check number.
- Multiple routing numbers: Large banks with nationwide operations (Chase, Bank of America, Wells Fargo) assign different routing numbers by state or region — the correct number depends on the state where you opened your account.
Most people only need their routing number in specific situations — setting up direct deposit, authorizing an ACH transfer, or providing payment information for a bill or tax refund. Knowing where to find it and which number to use prevents payment failures and delays.
Anatomy of a Check: Where to Find Your Routing Number
The routing number is always the first 9-digit sequence in the MICR line at the bottom of a paper check:
- Bottom left: ⑆[9-digit routing number]⑆ — the ⑆ symbols are MICR delimiters
- Middle: Your account number (length varies by bank)
- Bottom right: The individual check number
For a step-by-step visual guide, see how to find your routing number on a check. If you don’t have checks, routing numbers can also be found in your bank’s mobile app (usually under account details), your online banking portal, or directly from the bank’s website.
Routing Numbers by Major Bank
| Bank | Routing Number Notes | Find Yours |
|---|---|---|
| Bank of America | Multiple routing numbers — varies by state where account was opened | Bank of America routing number |
| Chase (JPMorgan Chase) | Multiple routing numbers by state | Chase routing number |
| U.S. Bank | Single routing number: 091000022 | U.S. Bank routing number |
| KeyBank | Single routing number: 041001039 | KeyBank routing number |
| BECU (Boeing Employees Credit Union) | Single routing number: 325081403 | BECU routing number |
For a comprehensive searchable list, see the complete bank routing numbers guide.
ACH Routing Number vs. Wire Transfer Routing Number
The same bank may have different routing numbers for different transaction types — a common source of payment failures:
| Transaction Type | Routing Number Used | Notes |
|---|---|---|
| Direct deposit / ACH transfer | ACH routing number | This is what employers and bill pay systems use; same number printed on checks for most banks |
| Domestic wire transfer | Wire routing number (ABA) | Often the same as the ACH number, but not always — verify with your bank before initiating |
| International wire transfer | SWIFT/BIC code (not a routing number) | 9-digit routing numbers are U.S.-only; international transfers require an 8–11 character SWIFT code |
| Paper check | MICR routing number | Printed on checks; typically the same as the ACH routing number |
Do Credit Cards Have Routing Numbers?
No — credit cards do not have routing numbers. Routing numbers identify bank deposit accounts (checking and savings) used in the ACH and wire transfer systems. Credit card transactions run through the card network (Visa, Mastercard, Amex) using the card number, not the banking routing system.
See do credit cards have routing numbers for a full explanation.
Pro Tip: When setting up direct deposit with an employer or government agency, always confirm whether they need your ACH routing number or wire routing number — the forms often just say “routing number” without specifying. For direct deposit, always use the ACH routing number (printed on your checks).
Using the wire routing number for direct deposit can cause the deposit to fail or be returned. When in doubt, call your bank and ask specifically: “What is my ACH routing number for direct deposits?”
How Routing Numbers Are Assigned
The American Bankers Association (ABA) has administered routing number assignment since 1910, when the system was created to facilitate check clearing between banks. The 9-digit structure encodes information about the bank:
- Digits 1–4: Federal Reserve routing symbol — identifies the Federal Reserve district and whether the bank uses Fed check processing
- Digits 5–8: ABA institution identifier — the bank’s unique number within its Federal Reserve district
- Digit 9: Check digit — mathematically derived from the first 8 digits to detect transcription errors
The check digit formula allows payment systems to automatically flag invalid routing numbers before processing — preventing payments from being sent to non-existent institutions.
Key takeaways
- A routing number is a 9-digit code identifying your bank in electronic transactions — required for direct deposit, ACH transfers, wire transfers, and paper check processing.
- Find your routing number at the bottom left of any paper check, in your bank’s mobile app under account details, or on your bank’s website.
- Large banks (Chase, Bank of America, Wells Fargo) have multiple routing numbers by state — always use the number for the state where you opened your account.
- ACH routing numbers and wire transfer routing numbers are sometimes different at the same bank — confirm which to use before initiating a transfer.
- International wire transfers use SWIFT/BIC codes, not 9-digit ABA routing numbers. Routing numbers are U.S.-only.
- Credit cards do not have routing numbers — the routing system applies only to deposit accounts (checking and savings).
Frequently Asked Questions
Is it safe to share my routing number?
Your routing number alone cannot be used to access your account — it only identifies the bank, not your account. However, your routing number combined with your account number is sufficient to initiate an ACH debit from your account.
Never share both together unless you’re authorizing a specific payment. Your routing number is printed on every check you write, so it’s not a secret — but your account number deserves more protection.
How do I find my routing number without a check?
Log into your bank’s mobile app or online banking portal and look under “Account Details,” “Account Information,” or “Account Settings.” Most banks display both routing and account numbers there. You can also call the number on the back of your debit card. See the bank routing numbers guide for a searchable list of routing numbers by institution.
What happens if I enter the wrong routing number for direct deposit?
If the routing number you provide doesn’t match a valid bank, the payment will typically be returned within 1–3 business days. If the routing number is valid but belongs to a different bank, the ACH network will usually reject the transaction because the account number won’t match a valid account at that institution. In rare cases, funds may be deposited to the wrong account — recovery then requires working with both banks and can take days to weeks. Always double-check routing and account numbers before submitting.
Table of Contents