The San Joaquin County Registrar of Voters Office is a part of the Information Systems Division and is responsible for conducting fair, impartial, accurate, secure and transparent federal, state and local elections. Other functions of the Registrar of Voters Office include voter registration, election administration and campaign finance disclosures.

San Joaquin County has approximately 334,000 registered voters of an estimated population of 455,000 eligible voters. It takes about 2,000 staff members, poll workers and election night workers to conduct a countywide election.