Your APR can be found in a few places.

Smart Assistant Just ask "What's my APR?"
See also: How do I use the U.S. Bank Smart Assistant™?

Statements In the "Interest Charge Calculation" section, usually found towards the end.
See also: How do I download and print my statements?

Cardmember Agreement Sent with the card at the time the account was opened. 
See also: How do I request my Cardmember Agreement for my credit card account?

if you have any questions, call us at the number on the back of your card, or at our general number 800-285-8585. We accept relay calls.