Sonoma County's voter rolls swelled Monday, the final day to register to vote in the Nov. 4 presidential election and the numerous local and statewide contests that have galvanized the electorate.

"There were over 245,000 voters on the last report I checked," said Gloria Colter, Sonoma County assistant registrar of voters. "We're up at least 10,000 voters from the general primary."

In February, 231,748 voters were registered for the primary election. Seventy-six percent of voters cast ballots, a record turnout for a primary.

The largest voter turnouts typically are in presidential elections.

Sonoma County set a record in 2004 with an 89.4 percent turnout in the presidential election and was second in the state to Marin County, which had 89.5 percent.

The Sonoma County Registrar of Voters office was open until 5 p.m. Monday for walk-in registration, and a self-serve, drive-up window was open until midnight for procrastinators.

Many people were aware they were up against a deadline.

"It's going like gangbusters," Colter said. "Lots are registering, and actually people are voting. It's a little mixture of everything. The drive-up is busy."

Many coming in were verifying they are already registered, and if not, were doing so, Colter said.

Some were turning in their absentee ballots. Colter estimated more than 5,000 ballots had arrived since Saturday.

You can reach Staff Writer Laura Norton at 521-5220 or