With exceptions to some busy intersections (such as near Mt. San Antonio College), the hilly and affluent city is considerably more relaxed in comparison to most nearby neighborhoods. The city is almost 9 square miles (23 km) and is home to more than 32,000 people and 600 businesses. A large Sysco headquarters is located in the city.
As of the census of 2000, there were 30,004 people, 8,260 households, and 7,582 families residing in the city. The population density was 1,290.0/km² (3,340.5/mi²). There were 8,395 housing units at an average density of 360.9/km² (934.6/mi²). The racial makeup of the city was 55.75% Asian, 28.37% White, 4.20% African American, 0.24% Native American, 0.08% Pacific Islander, 7.65% from other races, and 3.71% from two or more races. Hispanic or Latino of any race were 19.34% of the population.
There were 8,260 households out of which 50.6% had children under the age of 18 living with them, 77.1% were married couples living together, 9.9% had a female householder with no husband present, and 8.2% were non-families. 5.8% of all households were made up of individuals and 1.3% had someone living alone who was 65 years of age or older. The average household size was 3.63 and the average family size was 3.74.
In the city the population was spread out with 27.8% under the age of 18, 9.8% from 18 to 24, 27.2% from 25 to 44, 28.4% from 45 to 64, and 6.9% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 96.7 males. For every 100 females age 18 and over, there were 93.5 males.
According to a 2007 estimate, the median income for a household in the city was $100,360, and the median income for a family was $105,387. Males had a median income of $51,944 versus $36,197 for females. The per capita income for the city was $31,196. About 5.8% of families and 6.5% of the population were below the poverty line, including 7.8% of those under age 18 and 6.3% of those age 65 or over.