Here are some resources for checking your voter registration status or registering to vote.
Vote.gov offers links for registering to vote and voting, including deadlines. This is the official voter registration website of the United States government.
Rock the Vote is a nonpartisan nonprofit dedicated to building the political power of young people.
USA.gov has resources that let you check your registration, see if you are eligible to vote absentee, early, or on Election Day, and voter ID requirements.