Here are the states where you can register to vote on Election Day

( NewsNation ) — Americans hoping to cast ballots in the midterm elections on November 3 but have not yet registered to vote can do so on Election Day, depending on where they live .

A total of 21 states and Washington, D.C., allow voters to register on Election Day for the midterms. Prospective voters unsure of their registration status can visit this website to check.

Four states have less clear-cut rules than the others: Massachusetts, New York, and North Carolina allow same-day registration, but only during the early voting period, according to the National Conference of State Legislatures . North Dakota is the lone state where residents are not required to formally register to vote.

States that allow same-day voter registration for midterm elections

States have different registration processes and requirements, so would-be voters should visit their state’s individual election profile here . The following states and Washington, D.C. allow for election-day voter registration during the midterms:

States that don’t permit same-day voter registration for midterm elections

The 25 states that don’t allow for election-day voter registration during the midterms include:

NewsNation’s Jeff Arnold contributed to this report.