As of the census of 2006, there were 79,000 people, 29,870 households, and 17,902 families residing in the city. The population density was 3,871.3 people per square mile (1,494.5/km²). There were 29,870 housing units at an average density of 1,484.8/sq mi (573.2/km²). The racial makeup of the city was 65.16% White, 4.24% African American, 1.61% Native American, 10.31% Asian, 1.98% Pacific Islander, 15.57% from other races, and 6.42% from two or more races. Hispanic or Latino of any race were 48.84% of the population.
There were 28,060 households out of which 31.3% had children under the age of 18 living with them, 49.2% were married couples living together, 9.9% had a female householder with no husband present, and 36.2% were non-families. 27.1% of all households were made up of individuals and 8.0% had someone living alone who was 65 years of age or older. The average household size was 2.62 and the average family size was 3.20.
In the city the population was spread out with 23.2% under the age of 18, 8.4% from 18 to 24, 37.4% from 25 to 44, 20.9% from 45 to 64, and 10.2% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 101.2 males. For every 100 females age 18 and over, there were 100.4 males.
According to a 2007 estimate, the median income for a household in the city was $72,679, and the median income for a family was $82,964. Nevertheless, because of the extremely high cost of living in Redwood City, certain jobs (especially in the service industry) pay over $50,000 a year in Redwood City, and in other parts of the country these jobs would be classified as low-income. Disposable income is relatively constant when Redwood City is compared with the rest of the country, however. Males had a median income of $50,345 versus $41,125 for females. The per capita income for the city was $34,042. About 3.9% of families and 6.0% of the population were below the poverty line, including 6.3% of those under age 18 and 6.3% of those age 65 or over.