Today is the final day to register to vote for the Nov. 5 mayoral election in Boston, and the Election Department is extending its hours to accommodate last-minute registrations, officials said.

Boston had 368,207 registered voters for the September primary, when John R. Connolly and Martin J. Walsh topped a field of 12 candidates, said John Donovan, head assistant registrar at the department.

The election will determine if Connolly or Walsh will succeed long-time Mayor Thomas M. Menino. Voters will also pick city councilors — and the proposed East Boston casino will be on the ballot for East Boston residents.

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The Election Department in City Hall will stay open until 8 p.m. to accommodate voters. Residents can also print out registration forms from the city’s website and mail them to the department at 1 City Hall Square, Room 241, Boston, MA 02201, as long as it is postmarked by today’s date, Donovan said.