Polling places are open until 8 tonight for the gubernatorial primary election, with the San Diego County Registrar of Voters predicting a turnout of 35-40 percent.
The turnout in the last gubernatorial primary was 37.29 percent, according to the registrar's office.
Mail ballots are growing in popularity, with more than 685,000 issued for today's election. The registrar's office reported that it had received more than 223,000 mailed ballots by Monday.
More than 2,200 people voted early at the registrar's office in Kearny Mesa.
There are 1,241 polling places in the county and 5,329 poll workers. Among the more unusual polling places: A Master's Touch Pet Wash in Escondido; AMF Eagle Bowling Center in San Marcos; and Dizzy's Pizza in Centre City.
No major problems were reported at the polls this morning, according to registrar's spokeswoman Elizabeth Fitzsimons.
"Things are running smoothly so far," she said.
Fitzsimons reminds voters still holding mail-in ballots that they can be dropped off at any county polling place by 8 p.m. in order to be included in the vote count.
Four seats on the San Diego City Council are on the ballot -- with two of the posts held by incumbents likely to win reelection, one being vacated due to term limits and another vacant because its occupant is running for a state office.
San Diego voters will also decide whether to make permanent the city's five-year experiment with a strong-mayor form of municipal government.
Proposition D would also create a ninth City Council seat and increase to two-thirds the number of votes needed to override a mayoral veto.
Chula Vista voters are considering a controversial ballot measure that would bar the city from agreements that favor union labor in publicly funded projects.
Proposition G would essentially bar so-called "project labor agreements," or pacts between a municipality and unions that establish wages and benefits the workers on a public project must be paid by contractors.
Countywide Proposition B would amend the charter to impose a limit of two terms for members of the San Diego County Board of Supervisors.
