Campbell is home to the Pruneyard Shopping Center, a sprawling open-air retail complex which was involved in a famous U.S. Supreme Court case that established the extent of the right to free speech in California. The larger of the associated Pruneyard Towers, built in 1970, was for many years the tallest building between San Francisco and Los Angeles. Today the Pruneyard Shopping Center is home to Democrat Mike Honda and the south bay offices of the FBI.
As of the census of 2000, there were 39,200 people, 15,920 households, and 9,122 families residing in the city. The population density was 2,624.8/km² (6,802.8/mi²). There were 16,286 housing units at an average density of 1,120.9/km² (2,905.0/mi²). The racial makeup of the city was 72.78% White, 2.53% African American, 0.65% Native American, 14.16% Asian, 0.23% Pacific Islander, 4.87% from other races, and 4.77% from two or more races. Hispanic or Latino of any race were 13.33% of the population.
28.0% of the households had children under the age of 18 living with them, 42.6% were married couples living together, 10.1% had a female householder with no husband present, and 42.7% were non-families. 30.4% of all households were made up of individuals and 7.0% had someone living alone who was 65 years of age or older. The average household size was 2.38 and the average family size was 3.02.
The city population was 21.6% under the age of 18, 7.6% from 18 to 24, 40.2% from 25 to 44, 20.9% from 45 to 64, and 9.7% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 98.6 males. For every 100 females age 18 and over, there were 96.7 males.
About 48% of the adult population has at least one college-level degree. However, this has declined in recent years as a greater number of working-class immigrants move into the city.
The median income for a household in the city was $67,214, and the median income for a family was $78,663 (these figures had risen to $70,928 and $89,285 respectively as of a 2007 estimate). Males had a median income of $52,454 versus $43,750 for females. The per capita income for the city was $34,441. About 3.2% of families and 4.8% of the population were below the poverty line, including 4.2% of those under age 18 and 8.3% of those age 65 or over.
The average rainfall, based on the last nine years (1998-99 to 2006-07 rain season) of data, is 14.82 inches (376 mm).
Campbell is served by several major roads, including State Route 17, State Route 85 and San Tomas Expressway (Santa Clara County Route G4). Major local arterial roads include Winchester Boulevard and Bascom Avenue.
Public transport in Campbell is operated by the Santa Clara Valley Transportation Authority and includes several local and express bus lines that link the community to nearby towns, including Cupertino, Los Gatos, Palo Alto San Jose, Santa Clara and Saratoga. Additionally, the town is served by three light rail stations on the Mountain View - Winchester line, including Hamilton Station, Downtown Campbell Station, and the line's terminus at Winchester Station. These stations were opened as part of the first phase of the Vasona Light Rail project; the line will be extended past Winchester to Vasona Junction in Los Gatos once funding is secured. That line is now served by buses.
The extension was the subject of a minor dispute with the Federal Railroad Administration over the sounding of train horns late at night. This dispute delayed the opening of most of the extension for two months before the grand opening on October 1, 2005.