Home District 3 District 3 Browse this section to explore District 3 Is Otto your County Supervisor? Look up who your Supervisor is on the County of Santa Clara Elected Officials page. Look for vacancies on County Boards and Commissions. Catch up on the latest District 3 news and events. Sign up for the District 3 newsletter. See a map outlining District 3. District 3 profile offers a short description of the area covered by District 3.