Election Information

General Municipal Election - November 3, 2020

The City of Diamond Bar will hold a General Municipal Election on Tuesday, November 3, 2020 to fill two (2) Diamond Bar City Council seats for full four-year terms, and to vote on one ballot measure.

Qualified Candidates

  • Stan Liu
  • Jennifer Mahlke (Incumbent)
  • Ruth M. Low (Incumbent)
  • Tommy Orona
  • William "Bill" Rawlings
  • Samuel Gilbert Castorena Jr.
  • Aaron McElrea

Candidate Information

The nomination period for this election has closed. The public examination period starts August 8 and ends August 17, 2020. Due to the uncertainty related to COVID-19, City Hall remains closed to the public and an appointment is required to view candidate statements and ballot designations. Please call the City Clerk’s Office at (909) 839-7010 or send an email to make an appointment.

Candidate Nomination Packet

Download the November 3, 2020 General Municipal Election Nomination Packet .  Please note required nomination documents are not included in the packet. The candidate nomination period has now closed.

Candidate Qualifications

  • Must be a citizen of the United States.
  • Must be at least 18 years of age.
  • Must be a City of Diamond Bar resident at time nomination papers are issued.
  • Must be a registered voter within the city of Diamond Bar.

Election Signage Rules and Regulations

Key Dates

September 24, 2020

  • Los Angeles County Registrar-Recorder’s Office begins Mailing of Official Sample Ballot Booklets

October 5, 2020

  • Los Angeles County Registrar-Recorder’s Office begins Mailing of Vote by Mail Ballots
  • First day Vote by Mail Drop Boxes open
  • First day of early voting at RR/CC Headquarters (this may change due to COVID-19 considerations)

October 19, 2020

  • Official Registration Deadline. If a voter is not registered by this date they will not be issued a Vote by Mail Ballot.

October 24, 2020 

  • Vote Centers open 8 a.m. to 5 p.m.

November 3, 2020 

  • Election Day. Vote Centers open 7 a.m. to 8 p.m.
  1. City Clerk's Office


    Physical Address
    21810 Copley Drive
    Diamond Bar, CA 91765

    Phone: (909) 839-7010
    Fax: (909) 861-3117