Located at the junction of the Pomona and Orange freeways, Diamond Bar is primarily a residential city with shopping centers interspersed within the city. The city features a public Los Angeles County golf course.
Diamond Bar has the first hydrogen fueling station to be built in Southern California, near the South Coast Air Quality Management District (AQMD) building.
2000 56,287 1990 53,672 1980 28,045 1970 10,576
Similar to many San Gabriel Valley cities such as San Marino and Arcadia, Diamond Bar has experienced a remarkable growth in Asian American population - especially Filipino Americans, Taiwanese, Chinese Americans, Vietnamese Americans, Korean Americans, and Indian Americans - since the 1980s. Attracted to the area's schools and the prestige of a Diamond Bar address, many affluent Asian Americans commuting to areas such as Rowland Heights and Alhambra have moved here. In addition, some Asian-oriented businesses have since appeared in the city as well, albeit not on the massive scale like in Rowland Heights, Monterey Park, or Artesia.
As of the census of 2000, there were 56,287 people, 17,651 households, and 14,809 families residing in the city. The population density was 1,472.4/km² (3,813.2/mi²). There were 17,959 housing units at an average density of 469.8/km² (1,216.7/mi²). The racial makeup of the city was 41.05% White, 4.76% Black or African American, 0.33% Native American, 42.76% Asian, 0.12% Pacific Islander, 6.78% from other races, and 4.21% from two or more races. 18.46% of the population were Hispanic or Latino of any race.
There were 17,651 households out of which 44.4% had children under the age of 18 living with them, 68.3% were married couples living together, 11.1% had a female householder with no husband present, and 16.1% were non-families. 12.5% of all households were made up of individuals and 2.7% had someone living alone who was 65 years of age or older. The average household size was 3.18 and the average family size was 3.47.
In the city the population was spread out with 27.0% under the age of 18, 8.8% from 18 to 24, 29.6% from 25 to 44, 27.2% from 45 to 64, and 7.5% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 96.0 males. For every 100 females age 18 and over, there were 92.0 males.
According to the 2007 estimate, the median income for a household in the city was $87,224, and the median income for a family was $93,185. Males had a median income of $51,059 versus $37,002 for females. The per capita income for the city was $33,540. About 5.0% of families and 6.0% of the population were below the poverty line, including 5.1% of those under age 18 and 6.1% of those age 65 or over.