Another way to prepare for your trip is to register for the U.S. Department of State’s Smart Traveler Enrollment Program (STEP). Information on this program can be found at https://step.state.gov/step/.
In addition to the Embassy location in the capital city of Lima, the U.S has a Consular Agency available in Cusco. The pertinent details for both locations are listed here:
U.S. Embassy Lima, Peru
Avenida La Encalada cdra. 17 s/n
Surco, Lima 33
Emergency Telephone: 51-1-618-2000
U.S. Consular Agent – Cusco
Av. Pardo 845
Telephone: +(51) (84) 231-474
Emergency Telephone: +(51) 984-621-369
Fax: +(51) (84) 245-102
Be sure to revisit the U.S. State Department website for the newest information on Embassy and Consular services in Peru.