As of June 2018, there are 506,481 San Mateo County residents eligible to vote and out of this total, 388,456 are registered to vote. This means that 118,025 eligible voters are not yet registered to vote in San Mateo County. You can still register and cast your vote until November 6th– so there is still time to make sure everyone’s voice is heard. Communities that are civically engaged have better health outcomes. Source: State of California Elections Office