Templeton, CA is a small, rural town, but it is growing fast. It has added dwelling units faster since 1990 than any other community in the county (a 63% increase), with developments competing for prime land with vineyards.
As of the census of 2000, there were 4,687 people, 1,548 households, and 1,247 families residing in the CDP. The population density was 989.2 people per square mile (381.8/km²). There were 1,588 housing units at an average density of 335.2/sq mi (129.4/km²). The racial makeup of the CDP was 90.36% White, 1.17% African American, 0.70% Native American, 0.92% Asian, 0.09% Pacific Islander, 3.63% from other races, and 3.14% from two or more races. Hispanic or Latino of any race were 11.82% of the population.
There were 1,548 households out of which 49.7% had children under the age of 18 living with them, 65.4% were married couples living together, 11.5% had a female householder with no husband present, and 19.4% were non-families. 15.6% of all households were made up of individuals and 7.8% had someone living alone who was 65 years of age or older. The average household size was 2.98 and the average family size was 3.33.
In the CDP the population was spread out with 33.7% under the age of 18, 5.9% from 18 to 24, 29.8% from 25 to 44, 19.2% from 45 to 64, and 11.5% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 93.2 males. For every 100 females age 18 and over, there were 88.4 males.
The median income for a household in the CDP was $53,438, and the median income for a family was $58,750. Males had a median income of $41,268 versus $32,034 for females. The per capita income for the CDP was $19,671. About 6.3% of families and 9.1% of the population were below the poverty line, including 11.5% of those under age 18 and 4.7% of those age 65 or over.