A standard U.S. bank routing number is 9 digits long.

Quick Scoop: What Is a Routing Number?

A routing number is the 9‑digit code that identifies your bank or credit union so money can be sent to the right place for things like direct deposit, bill pay, and wire transfers.

  • It’s used in the U.S. banking system (ACH transfers, wires, checks).
  • It appears at the bottom of paper checks, usually on the left.
  • It tells payment systems which financial institution should receive or send the funds.

Think of the routing number as the city and state , and your account number as the street address and house number : you typically need both to get money to the right “destination.”

How Many Numbers Is a Routing Number?

  • In the United States, a routing number is always exactly 9 digits.
  • This 9‑digit format is defined by the American Bankers Association and used across banks and credit unions.

So if you’re counting the digits on your check or in your banking app and it’s a U.S. routing number, you should see 9 numbers total.

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