UPDATE: 11:40 p.m.

In front of his supporters, Mr. Zeldin offered a conciliatory victory speech Tuesday.

“This race offered a clear contrast of results or resistance and we campaigned on results and that is what won at the end of the day.

Isn’t that really what this is all supposed to be about on Election Day. People get elected in every corner of America. The day after an election is important that we get to the people’s business and deliver results.

“Our country needs to do a much better job uniting. In our county, we encourage disagreement. We encourage debate. That’s the American way. But we also need to ensure that our disagreements are being settled at the ballot box. I have an important role to play in this, as well. I know I can’t be all things to all people. But our country needs to do a better job coming together. Everyone that your looking at on this stage is committed to doing that for our country.

“I want to thank Perry Gershon for running a hard race. It is great to see so many people get active in the process, whether I come in first or second, it’s important that we are all coming together after this election. We have some important work ahead so let’s get it done.”

UPDATE: 11:20 p.m.

U.S. Representative Lee Zeldin held off challenger Perry Gershon of East Hampton on Tuesday to win a third term in the U.S. House of Representatives.

With only a handful of the 473 election districts still to report, the Republican held a margin of 52.5 percent to 46.4 percent.

Mr. Zeldin, 38, has served two terms in the U.S. House of Representatives from the 1st District, which includes all of the East End, plus Brookhaven Town and much of Smithtown Town.

Mr. Zeldin, a resident of Shirley, was on the Republican, Conservative, Independence and Reform party lines on Tuesday’s ballot. He won election to the House seat in 2014 and defeated former Southampton Town Supervisor Anna Throne-Holst for reelection in 2016 by a wide margin. Before being elected to Congress, he was a New York State senator from 2010 to 2014, from District 3.

His Democratic challenger, Mr. Gershon, 53, was on the Democratic and Working Families party lines on Tuesday. A businessman, this was his first run for elective office.

Together, the candidates raised a startling $8.7 million, with Mr. Gershon raising $4.5 million and Mr. Zeldin netting nearly $4.2 million. The Democrat outspent the incumbent, $4 million to $3.1 million, through October 17 reporting to the state.

UPDATE: 11 p.m.

Lee Zeldin’s lead over Perry Gershon appears to be holding as the count heads into the final stretch. With 374 of 473 districts reported, Mr. Zeldin continues to hold a lead of roughly 52 to 46 percent, which has been steady as results have been coming in over the past half hour.

Perry Gershon concedes race: “It’s not the outcome we wanted, but life goes on. We’re so much better off than we were two years ago. Everybody’s been great. We showed the Democratic Party has a heart here in Suffolk County. I’m not out of this. We’re gonna beat Lee Zeldin the next time, or whoever the Republican is.”

UPDATE: 10:35 p.m.

The fight for county comptroller remained tight, with Mr. Kennedy maintaining a 51 percent lead to Mr. Schneiderman’s 48 percent, with 831 of 1052 districts reporting.

UPDATE: 10:30 p.m.

Mr. Zeldin maintained his 52 percent to 46 percent lead with 337 of 473 districts reporting.

Both veteran legislators from the East End will return to Albany.

With 69 of 90 election districts counted in the 1st District, State Assemblyman Fred W. Thiele Jr. had a 61.3 percent to 38.7 percent lead over challenger Patrick O’Connor. Mr. Thiele, an Independent, was also the Democratic Party nominee, and had five lines in total. Mr. O’Connor was the nominee of the Republican and Conservative parties.

State Senator Kenneth LaValle likewise held a comfortable lead over challenger Gregory-John Fischer, 57.5 percent to 42.5 percent. A total of 169 of 212 precincts were counted as of 10:30 p.m. Tuesday. Mr. LaValle, 79, is a Republican who has been a state senator since 1976.

UPDATE: 10:05 p.m.

Lee Zeldin won reelection in 2016 by a margin of 15 percentage points. Returns on Tuesday night suggest this will be a closer race--but he remains on top.

With about half of the 1st District polling places having reported numbers, Mr. Zeldin holds a lead of about 52.2 percent to Mr. Gershon’s 46.8 percent.

UPDATE: 10 p.m.

Jay Schneiderman, as he watches the screen, said he was feeling nervous. “I’m okay either way. I love running the town of Southampton. I love being the supervisor there. This is my first county-wide race. I’ve certainly been able to elevate my profile and show that i can run in a larger playing field. I’ll be happy with either outcome.”

Mr. Schneiderman had 48 percent of the vote to Mr. Kennedy’s 52 percent with 305 of 1052 districts reporting.

UPDATE: 9:50

With 117 election districts of 473 reporting, the 1 st District race is very close, with Mr. Zeldin leading with 52 percent of the vote to Mr. Gershon’s 46 percent.

UPDATE: 9:45 p.m.

People begin to take their place along the railing at Republican headquarters with their eyes glued to the big screen anxiously awaiting the results.

Governor Cuomo and his ticket have been declared winners of their races.

UPDATE: 9:15 p.m.

More people arrive at the Democratic hall, while Mr. Gershon walks around to greet those in attendance. Southampton Town Supervisor Jay Schneiderman is also present.

UPDATE: 9 p.m.

There’s a big turn out at the Stereo Garden in Patchogue, where Suffolk County Republicans are gathering to view election results. A large majority of people are wearing black shirts reading Zeldin in white capital lettering followed by Congress in red. Mr. Zeldin’s daughters anxiously stare at the screen showing polls now closed.

Perry Gershon is standing on stage preparing to speak on camera with News 12 at the the IBEW Local 25, a labor union in Hauppauge. The polls closed just minutes ago and groups of supporters are standing around the hall waiting for the results to start coming in.

A big screen is being set up to show the Suffolk County general election results.

UPDATE: 5 p.m.

Reports from poll workers across the East End reported a larger than usual voter turnout on Tuesday.

Pierson High School in Sag Harbor was experiencing a lull in voter turnout, but poll volunteer Harry Campbell said it was very busy earlier in the day.

“The line’s been out the door, and for the first time since Obama ran,” said Mr. Campbell, who has been volunteering for the last 12 years. He said it was more of a turnout than the 2016 presidential election. He estimated about 450 votes submitted as of 3:30 p.m. They had already run out of voting stickers by that point.

“There’s a lot of controversy going on now with the different candidates and I think that they’re all coming out to vote for or against the president,” he said on the reason for the voter turnout increase. “Everyone knows who they’re voting for.”

There was a constant flow of people walking in and out of the Bridgehampton Community House, as people from election districts 3 and 13 were getting out of work and heading to the voting booths. Poll Coordinator Tony Lambert said that he saw a huge increase in voter turnout in both districts, estimating around 800 votes so far. He was the chairman of District 3 during the 2016 presidential election, but he said that turnout “kind of doubled” this election.

The poll coordinator at the Southampton High School was too busy to speak.

Mary Kohne, 38, of Southampton, just placed her vote at the high school. “I’m registered as a Republican, I was even a young Republican in high school, but it’s really changed. Now I vote some Republican some Democrat some Independent, but tonight I voted mostly Democratic,” she said, when asked who she voted for.

She added that she has seen more of a push to vote today through social media. “I definitely notice on social media, every single person had posted some picture saying, ‘Go vote,’ and normally I’m the only one that votes and no one else really seems to care,” Ms. Kohne said. “I’ve always kind of been very political, so it’s interesting to see people that have never been political before putting it out there.”

“The scanner was so full, it couldn’t take any more ballots,” David Hoffman, an election observer said at the East Hampton Emergency Service building polling station on Tuesday night. Mr. Hoffman observed polling stations earlier in the day at Pierson in Sag Harbor, and in Bridgehampton and said lines were out the doors earlier in the day. He said he noticed a lot of younger voters this election, and many first time voters.

At the East Hampton High School polling station, Melissa Frey said, “In the past five years, this is the most I’ve seen, even more than the presidential election.” She said during this election, she’s seen people of all ages, and of all nationalities.

At the Springs Fire Department polling station, the parking lot was filled at around 5:30 p.m. Lines of people filled the voting room. When asked the importance of voting, Gresa Shoshi, an East Hampton High School graduate and voter said, “So many people live in a world where their voice is silenced, and if we live in a world where we can make people listen, we should do just that.”

Original Story:

East End voters will be asked to vote in several prominent campaigns on Tuesday.

In one of the most contentious midterm congressional elections in decades, voters will be asked to choose between incumbent U.S. Representative and Republican Lee Zeldin, 38, and his Democratic opponent, Perry Gershon, 53. Mr. Zeldin will await the election results at Stereo Garden in Patchogue, whereas Mr. Gershon is expected at the International Brotherhood of Electrical Workers, Union 25 at 370 Motor parkway in Hauppauge.

As for New York State’s 1st Senatorial District seat, voters will decide between incumbent and Republican Kenneth P. LaValle, 77, and Democrat Gregory J. Fisher, 62, who made an unsuccessful run for his opponent’s seat in 2016. Mr. Fischer will join Mr. Gershon in after 9 p.m. at the labor union in Hauppauge.

Mr. LaValle’s counterpart, New York State Assemblyman Fred W. Thiele Jr., 65, who was first elected in 1995 and will seek his 13th two-year term as a member of the Independence Party, will face off against first-time challenger and Republican Patrick O’Connor, 53, of Shinnecock Hills.

In the race for New York State Governor, voters will choose between incumbent and Democrat Andrew Cuomo, 60, and Republican Marcus Molinaro, 43, who currently serves as and Dutchess County Executive.

A familiar face in Southampton Town will also be added to Tuesday’s ballot. Southampton Town Supervisor Jay Schneiderman, 56, is facing off against Republican John M. Kennedy Jr. in the race for Suffolk County comptroller.

If elected, Mr. Schneiderman's responsibilities as supervisor would temporarily fall to Southampton Town Deputy Supervisor Frank Zappone, although he would not be able to vote with other board members. In March, Mr. Schneiderman said, a special election would be held to permanently fill the seat.

Lastly, voters will be asked to re-elect U.S. Senator and Democrat Kirsten Gillibrand, 51, or replace her with newcomer Chele Farley, 51, a Republican.

Kate Browning’s name will also be added to the ballot for the congressional seat on the Women’s Equality Party line, however, in a prepared statement she said that she will be voting for Mr. Gershon, explaining that she had been unable to have her name removed.

“It is absolutely critical for Long Island’s future that Perry’s vision and business acumen be put to work for the people of Suffolk County,” wrote Ms. Browning, who was one of several contenders for the Democratic nomination for the seat during a contentious primary. “Another two years of Lee Zeldin’s extremism would expand the risk to our healthcare, our water and air, and our children’s safety from guns in their schools.”

More information about polling locations can be found at the Suffolk County Board of Elections website, suffolkvotes.com. For more information on the candidates, go to 27east.com and check out the election guide.