Santa Clara County voter registration forms are available at the Post Office on White Plaza. They are also available at http://www.ss.ca.gov/elections/votereg1.html. To be eligible to vote, you must be a U.S. citizen, a resident of California, and 18 years old on the day of the election. Other restrictions may apply. You must be registered to vote at least 15 days before an election in order to cast your ballot.