As of the census of 2000, there were 28,008 people, 11,203 households, and 7,842 families residing in the CDP. The population density was 2,832.7 people per square mile (1,093.4/km²). There were 11,461 housing units at an average density of 1,159.2/sq mi (447.4/km²). The racial makeup of the CDP was 88.04% White, 1.84% African American, 0.59% Native American, 4.22% Asian, 0.16% Pacific Islander, 1.78% from other races, and 3.37% from two or more races. Hispanic or Latino of any race were 6.31% of the population.
There were 11,203 households out of which 29.6% had children under the age of 18 living with them, 56.4% were married couples living together, 9.8% had a female householder with no husband present, and 30.0% were non-families. 23.5% of all households were made up of individuals and 6.5% had someone living alone who was 65 years of age or older. The average household size was 2.47 and the average family size was 2.91.
In the CDP the population was spread out with 22.8% under the age of 18, 6.8% from 18 to 24, 26.8% from 25 to 44, 29.9% from 45 to 64, and 13.8% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 96.8 males. For every 100 females age 18 and over, there were 93.3 males.
The median income for a household in the CDP was $63,252, and the median income for a family was $74,864 (these figures had risen to $72,636 and $88,630 respectively as of a 2007 estimate). Males had a median income of $52,365 versus $39,138 for females. The per capita income for the CDP was $31,874. About 4.6% of families and 6.5% of the population were below the poverty line, including 9.2% of those under age 18 and 2.2% of those age 65 or over.
The main highway used to access Fair Oaks is Highway 50. The main boulevards are Madison Avenue (east-west), Sunrise Boulevard (County Highway E2) (north-south), Hazel Avenue (County Highway E3) (north-south), Sunset Avenue (east-west), and Fair Oaks Boulevard (east-west).