The city has a distinct community within it, West Garden Grove, which is located in the westernmost portion of the city.
As of the census of 2000, there were 165,196 people, 45,791 households, and 36,449 families residing in the city. The population density was 3,539.5/km² (9,165.2/mi²). There were 46,703 housing units at an average density of 1,000.7/km² (2,591.1/mi²). The racial makeup of the city was 46.88% White, 30.92% Asian, 1.31% Black or African American, 0.76% Native American, 0.65% Pacific Islander, 15.35% from other races, and 4.12% from two or more races. 32.45% of the population were Hispanic or Latino of any race.
There were 45,791 households out of which 42.6% had children under the age of 18 living with them, 59.7% were married couples living together, 13.0% had a female householder with no husband present, and 20.4% were non-families. 15.2% of all households were made up of individuals and 6.0% had someone living alone who was 65 years of age or older. The average household size was 3.56 and the average family size was 3.90.
In the city the population was spread out with 28.5% under the age of 18, 9.2% from 18 to 24, 33.4% from 25 to 44, 19.3% from 45 to 64, and 9.5% who were 65 years of age or older. The median age was 32 years. For every 100 females there were 100.2 males. For every 100 females age 18 and over, there were 98.6 males.
The median income for a household in the city was $47,754, and the median income for a family was $49,697. Males had a median income of $33,295 versus $26,709 for females. The per capita income for the city was $16,209. About 10.5% of families and 13.9% of the population were below the poverty line, including 17.1% of those under age 18 and 10.0% of those age 65 or over.