Diamond Bar is governed by a city council/city manager style government with a council elected by the residents and a…More mayor elected annually by the council. Council members serve a term of four years. A city manager is appointed by the council to oversee the day-to-day activities of the city.</p> <p>The following offices are located at City Hall:</p> <ul> <li>City Council 909-839-7010</li> <li>Building and Safety 909-839-7020</li> <li>City Clerk's Office 909-839-7010</li> <li>City Manager's Office 909-839-7010</li> <li>Code Enforcement 909-839-7030</li> <li>Community Development 909-839-7030</li> <li>Community Services 909-839-7060</li> <li>DBtv Government Access Channel 909-839-7057</li> <li>Diamond Bar Center 909-839-7065</li> <li>Finance 909-839-7051</li> <li>Human Resources 909-839-7018</li> <li>Neighborhood Improvement 909-839-7030</li> <li>Planning 909-839-7030</li> <li>Public Information 909-839-7055</li> <li>Public Safety Services 909-839-7010</li> <li>Public Works/Engineering 909-839-7040</li> <li>Recreation Services 909-839-7070</li> <li>Senior Services 909-839-7068</li> <li>Transit Information 909-839-7045 </li> </ul>

The South Coast Air Quality Management District manages air-pollution regulations and policy for all of Orange County…More and urban portions of Los Angeles, Riverside and San Bernardino counties. The AQMD shares a building with Diamond Bar City Hall and has an auditorium that provides public-meeting space.</p> <p>In 2004, the AQMD facilities became the state's first to have a fueling station for hydrogen cars. A solar array adjacent to the building provides electricity for a number of electric vehicles in the AQMD fleet.</p>