Minnesota: Here’s how to vote, where to vote and what’s on the ballot.

Minnesota voters in the First Congressional District will see some names on the ballot twice on Tuesday. It is not a mistake.

There is a special general election to decide who will serve the final four months remaining in the term of Representative Jim Hagedorn, who died in February, as well as a regular primary for the same seat.

Not registered to vote? That is OK. The state’s same-day voter registration law means you can still head to the polls on Tuesday.

Here is what else to know:

How to vote

In-person voting ends at 8 p.m. Central time. Not sure if you are registered to vote? Check here, and use this state site for more information about same-day registration.

In most places in Minnesota, voters can cast their ballots in person or by mail with an absentee ballot, if one was requested in advance.

Some towns and cities with fewer than 400 registered voters have chosen to hold elections only by mail and delivered ballots to all registered voters before Election Day. Find out if that includes your town here.

Mail-in ballots must be received by elections officials on or before Election Day. If you have not already mailed yours, deliver it by hand to the election office that sent it to you no later than 3 p.m. Tuesday. Voters may not return mail-in ballots to polling places. Check the status of your mail ballot here.

Where to vote

Find your nearest polling place at the secretary of state’s website.

What is on the ballot

In addition to the special election and regular primary for Mr. Hagedorn’s seat, Representative Ilhan Omar, a well-known member of the progressive clique known as the squad, is seeking her third term in office and is once again facing a primary challenge from a moderate candidate. This time it is Don Samuels, who is running on a pro-law enforcement platform.

There are other statewide contests and some local races, too. See a sample ballot here.

Michael C. Bender contributed reporting.