The California Secretary of State has a semi-official list of all candidates for partisan office in the June 5, 2018 primary. See it here. To see the list for any particular office, with the addresses of each candidate, use the “Candidate Information” “Notice to Candidates” area.
To see a list of all candidates, without having to check each office separately, use the “Party preference history” area. Thanks to Tony Roza for the link.