WESTPORT — As crucial mid-term elections come to a head Tuesday, nearly 20,000 Westport voters are eligible to cast ballots in contests for U.S. Senate and House, governor and other state constitutional offices, General Assembly seats, probate judge and registrar of voters.

Polls are open for voting at 6 a.m. Tuesday until 8 p.m. Any eligible voter standing in line to cast a ballot as of 8 o’clock is allowed to vote.

There are five polling stations where voters from six districts will cast ballots in Tuesday’s elections:

District 1: Saugatuck Elementary School,  170 Riverside Ave. Voters, depending on their address, will cast ballots in either the 136th or 143rd state House of Representatives races.

District 2: Coleytown Middle School, 255 North Ave.

District 3: Long Lots School, 13 Hyde Lane.

Districts 4 and 5: Greens Farms School, 17 Morningside Drive South.

District 6: Westport Library, 20 Jesup Road.

Registered voters unsure of their polling place can use this “look-up tool” on the Secretary of the State’s website.

The main contests on Westport’s ballot include:

Governor: Ned Lamont, incumbent Democrat; Bob Stefanowski, Republican, and Rob Hotaling, Independent.

U.S. Senate: Richard Blumenthal, incumbent Democrat; Leora Levy, Republican.

U.S. Congress, 4th District: Jim Himes, incumbent Democrat; Jayme Stevenson, Republican.

26th state Senate District: Ceci Maher, Democrat; Toni Boucher, Republican.

136th state House of Representatives District: Jonathan Steinberg, incumbent Democrat; Alma Sarelli, Republican.

143rd state House of Representatives District: Dominique Johnson, Democrat; Nicole Hampton, Republican.

Judge of probate: Lisa Wexler, incumbent Democrat; Patrizia Zucaro, Republican.

Registrars of Voters: Deborah Greenberg, incumbent Democrat; Maria Signore, incumbent Republican.

A constitutional question about early voting is also on the ballot: “Shall the Constitution of the State be amended to permit the General Assembly to provide for early voting?” Ballots can be cast either “yes” or “no.”

A copy of Westport’s sample ballot is attached to the end of this article. To see all seven Westport sample ballots (which vary only in District 1), click here.

To be counted in Tuesday’s tabulations, all absentee ballots must be returned by 8 p.m. to the Town Clerk’s Office in Town Hall, 110 Myrtle Ave.

For questions, contact the Westport Registrars of Voters Office at 203-341-1115.