SACRAMENTO – Monday is the deadline to register to vote in California's June 3 primary election.

An estimated 23 million Californians are eligible to vote. As of last month, 15.9 million were registered.

Registration forms are available at most post offices, public libraries, city and county offices and secretary of state offices. They also can be downloaded from the secretary of state's Web site, www.sos.ca.gov.

Secretary of State Debra Bowen also is posting online election information, polling place locations and a checklist for voters.

The last day to request a vote-by-mail ballot for the June primary is May 27. Vote-by-mail ballots must be received by 8 p.m. on Election Day to be counted.

June 3 is the second of three statewide elections to be held in California this year, and the second primary. The state's presidential primary was Feb. 5.

June's election includes 53 congressional seats and 100 seats in the state Legislature, as well as two ballot initiatives regarding government's use of eminent domain, propositions 98 and 99.

The general election is Nov. 4.