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Sunnyvale is a city located in Santa Clara County, California. As of the 2010 United States Census, the population was 140,095.
Sunnyvale is the seventh most populous city in the San Francisco Bay Area and one of the major cities comprising 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 many technology companies and is a major operating center for many more. It is also home to several aerospace/defense companies.
The 2010 United States Census reported that Sunnyvale had a population of 140,081. The population density was 6,173.9 people per square mile (2,383.8/km²).
There were 53,384 households, out of which 18,614 (34.9%) had children under the age of 18 living in them, 28,583 (53.5%) were opposite-sex married couples living together, 4,629 (8.7%) had a female householder with no husband present, 2,341 (4.4%) had a male householder with no wife present. There were 2,386 (4.5%) unmarried opposite-sex partnerships, and 357 (0.7%) same-sex married couples or partnerships. 13,457 households (25.2%) were made up of individuals and 3,775 (7.1%) had someone living alone who was 65 years of age or older. The average household size was 2.61. There were 35,553 families (66.6% of all households); the average family size was 3.15.
The population was spread out with 31,435 people (22.4%) under the age of 18, 9,350 people (6.7%) aged 18 to 24, 50,919 people (36.3%) aged 25 to 44, 32,721 people (23.4%) aged 45 to 64, and 15,656 people (11.2%) who were 65 years of age or older. The median age was 35.6 years. For every 100 females there were 101.5 males. For every 100 females age 18 and over, there were 100.9 males.