If you're planning to vote by mail, it's best to do it early this week.

That's the message Sonoma County elections officials are trying to spread among the 183,000 registered voters who got mail-in ballots for the general election.

A third of those ballots had come in by Saturday, with about 4,000 more expected to come in Monday.

All those returned by 5 p.m. Nov. 5 will be counted on Election Day. The rest -- those delivered or dropped off by 8 p.m. on Election Day -- will be counted over the following days.

"For those individuals who want to see their ballots counted on Election Day, they need to get their ballots in now," said Gloria Colter, the county's assistant registrar of voters.

Dropoff locations for mail-in ballots this weekend, 10 a.m. to 4 p.m, include the veterans buildings in Santa Rosa, Cloverdale, Cotati, Sebastopol, Guerneville and Petaluma, the Windsor Town Hall and Healdsburg City Hall and the Sonoma Community Meeting Room.

The county's elections office will also be open over the weekend, from 8 a.m. to 5 p.m., for ballot dropoff. It is located at 435 Fiscal Drive in Santa Rosa.