City of Diamond Bar Phone Numbers and Emails

Toll-Free Number:

  • (800) 877-8339
    TTY/Voice communication

City Clerks Office:

  • (909) 839-7010

Construction Inspection Hotline:

  • (909) 839-7027

Employment Hotline:

  • (909) 349-8300

Environmental Services:

  • (909) 839-7015

Field / Weather Hotline:

  • (909) 348-8310


  • (909) 839-7051

Fire Department:

  • (323) 890-4045

General Info:

  • (909) 839-7000

Human Resources:

  • (909) 839-7018

Parking Administration Office:

  • (800) 989-2058


  • (909) 839-7050
  • (909) 839-7076
    Armed Forces Banner Program
  • (909) 839-7020
    Building and Safety Division
  • (909) 839-7070
    Parks and Recreation
  • (909) 839-7060
    Parks and Recreation Commission
  • (909) 839-7055
    Public Information

City of Diamond Bar Email:

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Contact Information

City of Diamond Bar Website:

City of Diamond Bar Help Center:

Corporate Office Address:

City of Diamond Bar
21810 Copley Drive
Diamond Bar, California 91765
United States

Other Info (opening hours):

Office Hours:

Monday - Thursday: 7:30 am - 5:30 pm

Friday: 7:30 am - 4:30 pm

More contact details



City of Diamond Bar is an affluent community in eastern Los Angeles County of California. The population was 55,544 at the 2010 census, down from 56,287 at the 2000 census. It is named after the "diamond over a bar" branding iron registered in 1918 by ranch owner Frederick E. Lewis. Located at the junction of the Pomona and Orange freeways, City of Diamond Bar is primarily residential with shopping centers interspersed throughout the city. It is surrounded by the suburban cities, such as Brea, Walnut, Chino Hills, and Rowland Heights. 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.

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