The routing number on a check is located on the bottom left corner of the check, states U.S. Bank. It is a nine-digit number that identifies the bank location where the account was opened.
Next to the routing number is the account number assigned to the customer by the bank, notes U.S. Bank. The final number on the bottom of the check refers to the check number, states the Texas Workforce Commission.
Individuals may need to give this information to their employer to set up direct deposit or to companies to make payments, as the Federal Reserve explains. However, criminals can also use this information to withdraw or transfer money out of the account.