Contact: Mark Church, Chief Elections Officer & Assessor-County Clerk-RecorderAlternate: Jim Irizarry, Assistant Chief Elections Officer & Assessor-County Clerk-Recorder (Redwood City, CA) San Mateo County Chief Elections Officer & Assessor-County Clerk-Recorder, Mark Church, announced today that Monday, May 21, 2018 is the deadline to register to vote in the June 5, 2018 Statewide Direct Primary Election.