Sunnyvale is the seventh most populous city in the San Francisco Bay Area and one of the major cities that make up Silicon Valley. It 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 California's high-tech area known as Silicon Valley, Sunnyvale is the headquarters location of companies including Juniper Networks, Fortinet, Advanced Micro Devices, NetApp, Spansion, Yahoo!, AppliedMicro, and Ariba. It is also home to several aerospace/defense companies: Lockheed Martin has a major facility in Sunnyvale, and Honeywell, Northrop Grumman Electronic Systems - Marine Systems (formerly Joshua Hendy Iron Works), Finisar, and Spirent also have offices there. Sunnyvale was also the home to Onizuka Air Force Station, often referred to as "the Blue Cube" due to the color and shape of its windowless main building. The facility, previously known as Sunnyvale Air Force Station, was named for the deceased Space Shuttle Challenger astronaut Ellison Onizuka. It served as an artificial satellite control facility of the United States armed forces until August 2010 and has since been decommissioned and demolished. Sunnyvale is one of the few U.S. cities to have a single unified Department of Public Safety, where all personnel are trained as firefighters, police officers, and EMTs, so they can respond to an emergency in any of the three roles. Library services for the city are provided by the Sunnyvale Public Library, located at the Sunnyvale Civic Center.
The City of Sunnyvale maintains a neighborhood association registry. The southern half of Sunnyvale is predominantly residential, while most of the portion of Sunnyvale north of Highway 237 is zoned for industrial use. Within this southern half are several neighborhoods that account for a large number of Eichler homes throughout residential Sunnyvale. More specifically, there are 16 housing tracts containing over 1100 Eichler homes. The far eastern section of El Camino Real in Sunnyvale has a significant concentration of businesses owned by South Indian immigrants. There are many parks in the Sunnyvale Area. These include Las Palmas Park, Ortega Park, Seven Seas Park Washington Park near downtown, two public golf courses, and Baylands Park, site of the annual Linux Picnic. Full Circle Farm , encompassing 11 acres, is the largest community-based urban farm in Silicon Valley, and is located in the Birdland neighborhood of Sunnyvale. Charles Street Gardens , Sunnyvale's oldest and largest community garden, is located adjacent to Sunnyvale's Public Library.