In the United States, yes — a transit number is the same as a routing number. Both names refer to the nine-digit ABA Routing Transit Number (RTN) that identifies your bank on checks, direct deposits, and electronic transfers.1American Bankers Association. ABA Routing Number The confusion comes from two places: “routing number” and “transit number” are each shortened versions of the full name, and Canadian banks use “transit number” to mean something else entirely.
The Different Names for the Same U.S. Number
The American Bankers Association created this identifier system so every U.S. bank and credit union would have a unique nine-digit code. LexisNexis Risk Solutions serves as the official registrar and maintains a database of roughly 22,000 active routing numbers.1American Bankers Association. ABA Routing Number The number was originally designed for check processing but now also directs payments through the ACH network, Fedwire, and other electronic systems.2Nacha. ACH Operations Bulletin 4-2024 – Importance of Maintaining Up-to-Date Routing Transit Numbers
Whatever a form calls it, these labels all point to the same nine-digit code:
- Routing number
- Transit number
- Routing transit number (RTN)
- ABA number
- ABA routing number
You don’t need to look up different numbers for different labels. If a U.S. form asks for a “transit number,” give it your routing number.
Where to Find Your Routing Number
On a paper check, the routing number is the first group of digits printed along the bottom in magnetic ink. This line is called the MICR (Magnetic Ink Character Recognition) line, and banks’ automated sorting equipment reads it to process checks at high speed. The MICR line generally shows three pieces of information in order: the routing transit number (framed by distinctive symbols that look like vertical bars with dots), the account number, and the check serial number.3Federal Reserve Board. Frequently Asked Questions About Check 21
If you don’t have a check on hand, you can find your routing number by logging into online banking, checking your bank’s mobile app, calling customer service, or looking on your bank’s website. Routing numbers are effectively public — banks publish them openly.
ACH vs. Wire Routing Numbers at the Same Bank
Even after you know that “transit number” and “routing number” mean the same thing, there’s a second wrinkle to be aware of. Some banks use one routing number for every transaction type, while others assign separate numbers for ACH transfers and wire transfers. The number printed on your checks is usually the one associated with check processing, and your bank may direct you to a different number for electronic ACH payments or Fedwire transfers. Using the wrong type can delay or fail the transaction.
ACH transactions are processed in batches through the Automated Clearing House network and handle things like direct deposits, bill payments, and recurring transfers. Wire transfers move through Fedwire individually, settle faster, and often carry fees. When you set up a payment, check whether the form specifies “ACH routing number” or “wire routing number,” and confirm the right one with your bank.
The originating bank is responsible for verifying the routing number it submits with each ACH transaction.2Nacha. ACH Operations Bulletin 4-2024 – Importance of Maintaining Up-to-Date Routing Transit Numbers If you aren’t sure which number applies, call your bank rather than guess. A wrong number can send your payment to the wrong place or bounce it back after several business days.
Canadian Transit Numbers Are Different
In Canada, “transit number” is not another name for the routing number. A Canadian transit number is a five-digit code that identifies a specific bank branch, and it’s paired with a separate three-digit institution number that identifies the bank itself.4CIBC. Transit Number, Institution Number and Account Number CIBC’s institution number, for example, is 010, while the transit number changes depending on the branch.
For electronic transfers within Canada, those two codes are combined with a leading zero to form a nine-digit routing number: zero first, then the three-digit institution number, then the five-digit transit number. A Canadian check showing 12345-678 corresponds to the electronic routing number 067812345.
This matters for anyone dealing with both countries. A Canadian five-digit transit number won’t work in a U.S. system expecting a nine-digit routing number, and a U.S. routing number won’t work in a Canadian system that wants a branch transit and institution number. If a form is Canadian and asks for a transit number, it wants the five-digit branch code, not your U.S. routing number.
International Transfers Use a Different System Entirely
A U.S. nine-digit routing number only works for domestic transfers. When money crosses borders, banks use a different identifier: a SWIFT/BIC code (Business Identifier Code), an eight-character alphanumeric code assigned under the international standard ISO 9362. An optional three-character branch code can extend it to eleven characters.5SWIFT. Business Identifier Code (BIC)
Sending money abroad usually requires the recipient’s SWIFT/BIC code, their account number or IBAN (International Bank Account Number), and the bank’s name and address. Substituting a routing number for a SWIFT code on an international transfer will cause the payment to fail.
Quick Answer by Context
Here’s how to interpret the question depending on where the form is coming from:
- U.S. form asking for a transit number, routing number, RTN, or ABA number: give the nine-digit routing number from the bottom of your check.
- U.S. form asking specifically for an ACH or wire routing number: confirm the correct number with your bank, since it may differ from the one on your check.
- Canadian form asking for a transit number: give the five-digit branch code, not a U.S. routing number.
- International transfer: use a SWIFT/BIC code and IBAN or account number, not a routing number.