The city is bordered by the San Francisco Bay and 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, Sunnyvale is headquarters to several high-tech companies such as Maxim Integrated Products, Juniper Networks, Palm, Inc., AMD, NetApp, Spansion, Yahoo!, Mirapoint, and Ariba. Sunnyvale is also home to several aerospace/defense companies; Lockheed Martin has a major facility in Sunnyvale, and Honeywell, Northrop Grumman Electronic Systems - Marine Systems (location of the Hendy Iron Works Museum), and Spirent Communications also have offices in Sunnyvale. Sunnyvale is also the home to Onizuka Air Force Station, where its main building, locally known as the Blue Cube, is its most prominent feature. The base, named for the deceased Space Shuttle Challenger astronaut Ellison Onizuka, is the primary artificial satellite control facility of the United States armed forces.
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.
As of the census of 2000, there were 131,760 people, 52,539 households, and 32,679 families residing in the city. The population density was 6,006.5 people per square mile (2,318.7/km²). There are 53,753 housing units at an average density of 946.0 persons/km² (2,450.4 persons/sq mi). The racial makeup of the city is 53.27% White, 32.27% Asian, 2.22% African American, 0.46% Native American, 0.32% Pacific Islander, 7.19% from other races, and 4.25% from two or more races. 15.48% of the population are Hispanic or Latino of any race.
There were 52,539 households out of which 27.6% had children under the age of 18 living with them, 50.0% were married couples living together, 8.2% had a female householder with no husband present, and 37.8% were non-families. 27.1% of all households were made up of individuals and 6.4% had someone living alone who was 65 years of age or older. The average household size was 2.49 and the average family size was 3.06.
In the city the population was spread out with 20.4% under the age of 18, 7.7% from 18 to 24, 41.3% from 25 to 44, 19.9% from 45 to 64, and 10.6% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 105.9 males. For every 100 females age 18 and over, there were 106.5 males.
Under the 2000 Census, the median income for a household in the city was $74,409, and the median income for a family was $81,634, but under the Census Bureau's 2007 estimates, these figures have risen to $87,417 and $104,439, respectively.
Under the 2000 Census, males had a median income of $65,165 versus $43,051 for females. The per capita income for the city was $36,524. About 3.7% of families and 5.4% of the population were below the poverty line, including 5.5% of those under age 18 and 5.2% of those age 65 or over.
Sunnyvale is served by the Santa Clara Valley Transportation Authority (both light rail and buses) and the Caltrain commuter rail. The SR 85, US 101, SR 237, and I-280 freeways run through the city. A segment of State Route 82 runs through the center of the city, following the path of historic El Camino Real. Sunnyvale has also been listed by the League of American Bicyclists as a Bicycle Friendly Community at the bronze level, having multiple on-street and off-street bike lanes, bicycle-activated traffic signals, and bicycle accommodations on both VTA and Caltrain. The Bicycle and Pedestrian Advisory Committee advises the city council on the continued development of the bicycle plan for the city.
Sunnyvale has wide and well maintained roads. Most large streets, such as El Camino Real, have a large, landscaped center median.
For commercial passenger air travel, Sunnyvale is well served by three nearby international airports. The closest, Norman Y. Mineta San Jose International Airport (SJC) is a 9.5 mile drive from downtown Sunnyvale by car. It is also accessible by Caltrain, VTA light rail and VTA bus (with both the Caltrain and Light Rail stations requiring transfer to a free shuttle bus to get to the airport terminal). The next closest is San Francisco International Airport (SFO), which is 27.7 miles by car. SFO is also transit accessible via Caltrain and Bay Area Rapid Transit (BART). The Metropolitan Oakland International Airport (OAK), which is 37.5 miles by car. Access to Oakland airport by public transit is possible via multiple transfers.