PLEASANTON -- It is too late to mail them in, but Pleasanton voters have until Tuesday night to submit their ballots for a vacant City Council seat.

Completed and signed ballots must be hand-delivered to the Pleasanton city clerk's office at 123 Main St. by 5 p.m. Tuesday. They can also be dropped off at the Alameda County Registrar of Voters office, 1225 Fallon St., Room G -- inside the Rene C. Davidson Courthouse in Oakland -- until 8 p.m. Drop-off centers are located outside the courthouse and the Alameda County Administration Building at 1221 Oak St., Oakland.

The special election is to fill a seat vacated in November when Councilman Jerry Thorne was elected mayor. Mark Hamilton, Kathy Narum, David Miller and Olivia Sanwong are seeking the office.

According to Pleasanton City Clerk Karen Diaz, the county had received 10,790 ballots by Monday, representing about 25 percent of the city's registered voters.

Initial returns will begin posting after 8 p.m. Tuesday on the Alameda County Registrar of Voters website at www.acgov.org/rov/ and through a link on the city's website at www.ci.pleasanton.ca.us. Diaz said all ballots should be counted by Friday.

For more information, go to www.acgov.org/rov/upcoming-election.htm or call the city clerk's office at 925-931-5027.

Contact Jeremy Thomas at 925-847-2184. Follow him at Twitter.com/jet_bang.