Your Routing Number is a nine-digit code that's based on the U.S. Bank location where your account was opened. It's the first set of numbers printed on the bottom of your checks, on the left side.
See here for more info: https://www.usbank.com/bank-accounts/checking-accounts/aba-routing-number.aspx
If you still have questions, please call your bank and ask them what the routing number for your account is. Please mention that you need it for ACH payments.