Granite Bay is a census-designated place (CDP) in Placer County, California, United States. It is part of the Sacramento–Arden-Arcade–Roseville Metropolitan Statistical Area. The population was 19,388 at the 2000 census. The ZIP code is 95746. Granite Bay is a primarily residential suburb of Sacramento located just east of Roseville and west of Folsom Lake.
Granite Bay is located at(38.748504, -121.179793).
According to the United States Census Bureau, the CDP has a total area of 21.7 square miles (56.1 km²), of which, 21.6 square miles (55.9 km²) of it is land and 0.1 square miles (0.2 km²) of it (0.32%) is water. The place name, Granite Bay, is derived from a bay in Folsom Lake on the east side of the town. The entire town is underlain by granodiorite of the Penryn Pluton of Cretaceous age, hence the geological basis for the place name.
As of the census of 2000, there were 19,388 people, 6,474 households, and 5,587 families residing in the CDP. The population density was 898.2 people per square mile (346.9/km²). There were 6,626 housing units at an average density of 307.0/sq mi (118.6/km²). The racial makeup of the CDP was 91.40% White, 0.68% Black or African American, 0.58% Native American, 3.53% Asian, 0.08% Pacific Islander, 1.09% from other races, and 2.65% from two or more races. 4.69% of the population were Hispanic or Latino of any race.
There were 6,474 households out of which 45.1% had children under the age of 18 living with them, 77.0% were married couples living together, 6.3% had a female householder with no husband present, and 13.7% were non-families. 10.6% of all households were made up of individuals and 3.5% had someone living alone who was 65 years of age or older. The average household size was 2.99 and the average family size was 3.22.
In the CDP the population was spread out with 30.8% under the age of 18, 4.7% from 18 to 24, 24.8% from 25 to 44, 30.6% from 45 to 64, and 9.2% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 100.2 males. For every 100 females age 18 and over, there were 96.7 males.
According to a 2007 estimate, the median income for a household in the CDP was $115,980, and the median income for a family was $119,874. Males had a median income of $100,000+ versus $73,190 for females. The per capita income for the CDP was $57,970. About 1.5% of families and 2.1% of the population were below the poverty line, including 1.9% of those under age 18 and 2.3% of those age 65 or over.