For California voters, it’s the day to choose the Republican and Democratic nominees for president, plus voting for a slew of down-ballot positions. As the most populous state in the nation, California delivers more delegates in the presidential primaries than any other state.

All California voters will receive a ballot in the mail by Feb. 5, according to the secretary of state’s office, and can begin casting their votes as early as a month before the election. There are several options for how to send in a ballot — vote by mail, dropping a ballot at a vote center or ballot drop box, or having someone else submit the ballot on your behalf.

Here is some information you need on where to cast your ballot.