About Half The States Allow Same Day Voter Registration

Here´s the info on which ones do that

Same Day Voter Registration

Almost half of U.S. states allow eligible voters to register at the same time they cast their ballots on Election Day and/or during early voting.

What States Allow Same Day Voter Registration and When?

Find your state below, then visit Rock the Vote’s election center for information on Election Day and early voting times, id requirements, where to vote, and more!

StateAllows Same-Day RegistrationDuring Early Voting & In-Person Absentee VotingOn Election DayAlabama---Alaska--Only offered in presidential elections to vote for President & Vice PresidentArizona---Arkansas---CaliforniaColoradoConnecticutGeneral Elections OnlyGeneral Elections Only: you can only register at your town's designated location, not at your polling placeGeneral Elections Only: you can only register at your town's designated location, not at your polling placeDelaware---District of ColumbiaFlorida---Georgia---HawaiiIdahoIllinoisIndiana---IowaKansas---Kentucky---Louisiana---MaineAt the town office or city hallMarylandMassachusetts---MichiganAt your city or township clerk's office with proof of residencyAt your city or township clerk's office with proof of residencyMinnesotaMississippi---Missouri---MontanaAt your County Clerk's officeAt your County Clerk's officeNebraska---NevadaNew Hampshire-New Jersey---New MexicoAt your County Clerk’s office; some County Clerks will offer additional same day voter registration locations at expanded early voting sitesNew York-Only on the first day of Early Voting at local election office-North Carolina-North DakotaN/A: No Voter Registration RequiredN/AN/AOhio---Oklahoma---Oregon---Pennsylvania---Rhode Island--Only offered in presidential elections to vote for President & Vice President; at a location designated by your local Board of Canvassers, not at your polling placeSouth Carolina---South Dakota---Tennessee---Texas---UtahVermontAt your town or city clerk's officeVirginiaAt the office of your general registrar or satellite locationWashingtonWest Virginia---WisconsinYes, up until the Friday before Election Day; check with your local election office for availabilityWyoming

click on the link for a good graphic of the states then if your state does same day voter registration, then click on your state name to find out how:

https://www.rockthevote.org/how-to-vote/same-day-voter-registration/