Sunnyvale is a city in Santa Clara County, California. It is one of the major cities that make up the Silicon Valley. The city is bordered by portions of San Jose to the north, Moffett Federal Airfield to the northwest, Mountain View to the west, Los Altos to the southwest, Cupertino to the south, and Santa Clara to the east. It lies along the historic El Camino Real and Highway 101. As part of the Silicon Valley, several high-tech companies such as Maxim Integrated Products, Juniper Networks, Palm, Inc., AMD, NetApp, Spansion, Yahoo!, Simco Electronics, Mirapoint, AppliedMicro and Ariba are headquartered in Sunnyvale. Sunnyvale encompasses the 94085, 94086, 94087, and 94089 zip codes.