The routing number on a check is the first set of numbers on the bottom left, and it is always a 9‑digit code that identifies your bank.

Where the routing number is

  • Look at the very bottom of your check.
  • You will see three groups of numbers printed in special “machine-readable” font.
  • The routing number is:
    • The leftmost group.
    • Exactly 9 digits long.
    • Often surrounded by small symbols that are not part of the number.

A typical layout (left to right) is:

  1. Routing number (9 digits, bottom left).
  1. Account number (middle group, usually longer and unique to you).
  1. Check number (rightmost group, matching the printed check number at the top).

Quick way to double‑check

  • Count the digits: if it’s not 9 digits, it’s not the routing number.
  • Compare with your bank’s website or app; they usually list your routing number and it should match the one on the bottom left of your check.

TL;DR: On a standard U.S. check, the routing number is the 9‑digit number on the bottom left; the account number is in the middle, and the check number is on the right.

Information gathered from public forums or data available on the internet and portrayed here.