Voters across Maine will have the chance to cast ballots Tuesday in state and local elections, including races for U.S. Senate, Maine’s two congressional seats and governor.

More than 56,000 voters had already cast absentee ballots as of Thursday, the last day of in-person absentee voting, according to data from the Maine Department of the Secretary of State.

Results should start coming in Tuesday night, though it will take longer to know the outcome in any races that go to ranked-choice runoffs.

Three high-profile elections, including the two gubernatorial primaries and the Democratic primary in the 2nd Congressional District, are expected to go to ranked-choice runoffs.

Here are a few things to know about who’s on the ballot and how to vote.

WHO’S ON THE BALLOT?

Mainers will decide primary races for U.S. Senate, two congressional seats and governor as well as dozens of legislative primaries. All 186 seats in the Maine Legislature are up for grabs — though not all feature primaries. There are also local races, school budgets and local referendums on the ballot.

The contest for Senate is Maine’s highest-profile race. Political newcomer Graham Platner, who has faced a number of scandals recently but has inspired thousands with his platform of economic populism, is expected to win the Democratic primary and take on U.S. Sen. Susan Collins in November.

Collins, a five-time incumbent Republican, is not facing a primary challenger. On the Democratic side, Platner was expected to have a major competitor in Gov. Janet Mills, but Mills suspended her campaign on April 30 after trailing Platner in polling and fundraising.

Mills is still on the ballot, however, and has not filed the paperwork to formally withdraw and have any votes cast for her dismissed. Also on the Democratic ballot is David Costello, a former government official in Maine and Maryland. Andrea LaFlamme is mounting a write-in candidacy for the Democratic nomination, too. Costello and LaFlamme have trailed both Mills and Platner badly in terms of fundraising and polling.

Both gubernatorial primaries are crowded. The Democratic race includes: Shenna Bellows, Maine’s secretary of state; Troy Jackson, the former Maine Senate president; Angus King III, a renewable energy entrepreneur and the son of U.S. Sen. Angus King; Hannah Pingree, the daughter of U.S. Rep. Chellie Pingree and former speaker of the Maine House; and Nirav Shah, the former director of the Maine Center for Disease Control and Prevention.

On the Republican side, the candidates are: Jonathan Bush, a businessman and cousin of former President George W. Bush; Bobby Charles, a former U.S. assistant secretary of state; David Jones, a real estate broker; Garrett Mason, the former Maine Senate majority leader; Owen McCarthy, a medical technology entrepreneur; Ben Midgley, a former fitness franchise executive; and Robert Wessels, a retail manager from the town of Paris.

State Sen. Jim Libby, R-Standish, ended his campaign after failing to qualify for clean elections funding. But like Mills, he has not formally withdrawn and will still be on the ballot. Libby has not filed the paperwork that would prompt the state to dismiss any votes cast for him, so votes for Libby will still count in the Republican primary.

In the 1st Congressional District, U.S. Rep. Chellie Pingree is running unopposed in the Democratic primary. Republicans Joshua Pietrowicz, a former Toyota sales and leasing consultant from New Gloucester, and Ron Russell, a retired U.S. Army veteran and consultant from Kennebunkport, are vying for their party’s nomination.

And in the 2nd District, Democrats Joe Baldacci, a state senator from Bangor; Matt Dunlap, the state auditor and former secretary of state; Jordan Wood, a former congressional staffer; and Paige Loud, a social worker and graduate student, will compete in their party’s primary. Former Gov. Paul LePage is the only Republican on the ballot in that race.

All 186 seats in the Maine Legislature are up for grabs this year, though most primaries are uncontested. Voters will also decide school budgets and other local issues and races on Tuesday.

HOW CAN I CAST A BALLOT?

Polls open at varying times across municipalities in Maine, but all polls will close at 8 p.m. on Election Day. Only ballots received by 8 p.m. will be counted, regardless of postmark. (It’s too late to put your ballot in the mail!)

In many towns and cities, voters may return absentee ballots via secure drop boxes. The secretary of state’s office has advised that absentee ballots can also be returned at many clerks’ offices and polling places through Election Day, but it’s a good idea to check with your local municipality on specific rules.

The city of Portland, for example, is requiring that absentee ballots be returned via drop boxes outside City Hall on Myrtle Street or at 212 Canco Road. Absentee ballots may not be returned at polling locations in Portland.

Your absentee ballot must be in its provided envelope, which must be signed and sealed. A voter who requested an absentee ballot but did not return it can vote in person at their polling location.

CAN I STILL REGISTER TO VOTE?

Yes. While the deadlines to register to vote online or by mail have already passed, Maine has same-day voter registration in person at the polls.

To register to vote, you must be a citizen of the United States. Voters 16 and older may register to vote, but to vote in this week’s primary, you must be 18 by the time of the general election in November.

Voters registering for the first time will need to provide identity documents showing they have established residency in Maine. Acceptable documents include government credentials with or without photo ID, including driver’s licenses, passports and birth certificates; official documents showing the name and address of the voter, such as utility bills or bank statements; and photo student IDs from state-approved public or private schools or institutes of higher education in Maine.

CAN INDEPENDENTS VOTE IN THE PRIMARIES?

Maine has semi-open primaries, meaning unenrolled or independent voters can cast ballots in any single party primary without enrolling in that party. Voters who are enrolled in a party may only vote in that party’s primaries.

Enrolled voters who want to unenroll or switch parties may do so on Election Day, but it is past the deadline for the change to take effect for this election. Voters who wanted to unenroll or switch parties in time for this primary were required to have done so by May 26.

WHEN WILL WE KNOW RESULTS?

Election results will start coming in Tuesday evening after the polls close. Municipalities may post results on their websites or social media pages, or email them out via interested parties lists. Sometimes they are simply announced locally and physically posted in the town.

In ranked-choice elections, municipalities will announce the results of first-choice votes only on election night. The secretary of state’s office will announce, either Tuesday night or Wednesday, if a race is slated for a ranked-choice runoff.

In those cases, the office has said it is aiming to begin the tabulation of ballots on Friday, June 12 with a goal of having results by Friday, June 19.