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City of Diamond Bar    

General Law city
Incorporated: May 18, 1989
City Hall: 21825 E Copley Dr, Diamond Bar 91765
City Telephones: (909) 839-7000, Fax (909) 861-3117
Internet: http://www.ci.diamond-bar.ca.us/
Population (2010 Census): 55,544 (2000 Census: 56,287; 1990 Census: 53,672) For latest State Population Estimates, click here.
Population Density (2010 Census): 3,732.8 persons per square mile
Population Age 65+ (2000 Census): 7.5% (1990 Census: 4.2%)
Population Under Age 18 (2010 Census): 21.4% (2000 Census: 27.0%; 1990 Census: 28.6%)
Land Area: 14.88 square miles (38.54 square kilometers); Water Area: 0.01 square miles (0.01 square kilometers)

• Racial/Ethnic Demographics
• Age Demographics
• Median Household and Family Income and Per Capita Income

Other City Facts & Statistics

City in red below. Click on map for more detailed color map of county.