Tisbury voters headed to the polls on a sunny Tuesday for their annual town election, looking to decide a three-way race for selectboard and a ballot question regarding an expansion to the town sewer.

Two-term incumbent Melinda Loberg is facing two challengers in the race: former fellow selectman Larry Gomez and first-time candidate Melanie Englert.

Polls in the town opened at noon, and within minutes a line of masked voters had formed under the summer sun, toeing social-distancing lines taped six feet apart on the walkway outside the town Emergency Services Facility building on Spring street.

Even with face coverings and ball caps, some people in the queue recognized one another and chatted. “I wasn’t prepared for the wait,” one woman said. “I don’t know why. Of course there’s a wait.”

Inside, clear plastic panels shielded masked town officials and poll workers as they checked voters in and out. Voters are required to drop pens in a bin so they can be reused and sanitized. Only three voters at a time are allowed in the room.

Turnout was brisk throughout the afternoon, with the parking lot perpetually full and the line steadily extending out the door. By 1:30 p.m. nearly 200 voters had already cast ballots, according to the electronic voting machine.

Campaigners holding signs for Ms. Loberg and Mr. Gomez spread themselves along the Tisbury School fence outside the polling station throughout the day.

Tisbury resident Katharine Kavanaugh, who had been hunkering down with her parents on the mainland, said she scheduled a trip back to the Island just so that she would have 14 days to quarantine before voting in the town election.

“I planned the trip so I’d be able to vote,” Ms. Kavanaugh said. “We take care of each other on Martha’s Vineyard, and do our civic duty. And if I don’t vote, I can’t complain.”

The election is being managed by Oak Bluffs town clerk Colleen Morris, because Tisbury clerk Hillary Conklin is on the ballot. In return, Ms. Conklin said she ran the Oak Bluffs election last week.

Ms. Conklin is running unopposed — and the only contested race on the ballot is for town selectman.

Tisbury voters will also decide today on whether to borrow $6.4 million in order to extend sewer service to the State Road business district and increase capacity at the town wastewater plant. The measures passed at town meeting but need a majority vote at the ballot box to approve the Proposition 2 1/2 debt exemption.

Cousins Peter and Rubin Cronig said that they normally vote in town elections, and appreciated living in a country where voting, and elections, were the norm.

“We try to make every one,” Peter said. “Now, who’s on the ballot?”

Polls close at 8 p.m.