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 22, 2017 is the deadline to register to vote in the June 6, 2017 Town of Atherton Special Mail Ballot Election.