Alabama,    https://www.alabamainteractive.org/sos/voter_registration/voterRegistrationWelcome.action

Alaska, https://voterregistration.alaska.gov/

Arizona, https://servicearizona.com/VoterRegistration/selectLanguage

Arkansas, https://www.sos.arkansas.gov/elections/for-voters

California, https://registertovote.ca.gov/

Colorado, https://www.sos.state.co.us/voter/pages/pub/olvr/verifyNewVoter.xhtml

Connecticut, https://ballotpedia.org/Voting_in_Connecticut

Delaware, https://ivote.de.gov/VoterView

Florida, https://registertovoteflorida.gov/home

Georgia, https://registertovote.sos.ga.gov/GAOLVR/welcome.do#no-back-button

Hawaii, https://olvr.hawaii.gov/Default.aspx?redir=1

Idaho, https://elections.sos.idaho.gov/ElectionLink/ElectionLink/ApplicationInstructions.aspx

Illinois, https://ova.elections.il.gov/

Indiana, https://indianavoters.in.gov/

Iowa, https://sos.iowa.gov/elections/voterinformation/voterregistration.html

Kansas, https://www.kdor.ks.gov/apps/voterreg/home/index

Kentucky, https://vrsws.sos.ky.gov/ovrweb/

Louisiana, https://www.sos.la.gov/ElectionsAndVoting/Pages/OnlineVoterRegistration.aspx

Maine, https://www.maine.gov/sos/cec/elec/voter-info/votreg.html

No online voter registration

Maryland, https://voterservices.elections.maryland.gov/OnlineVoterRegistration/InstructionsStep1

Massachusetts, https://www.sec.state.ma.us/ovr/

Michigan, https://mvic.sos.state.mi.us/registervoter

Minnesota, https://mnvotes.sos.state.mn.us/VoterRegistration/VoterRegistrationMain.aspx

Mississippi, https://www.sos.ms.gov/elections-voting/voter-registration-information

No online registration

Missouri, https://www.sos.mo.gov/elections/goVoteMissouri/register.aspx

Montana, https://sosmt.gov/elections/vote/

No online registration

Nebraska, https://www.nebraska.gov/apps-sos-voter-registration/

Nevada, https://www.nvsos.gov/sosvoterservices/Registration/Step0.aspx

New Hampshire, https://www.sos.nh.gov/elections/voters/register-to-vote/

No online registration

New Jersey, https://voter.svrs.nj.gov/register

New Mexico, https://portal1.sos.nm.gov/OVR/(S(rbl2hur3aj2kn3x5t5rn4wnl))/WebPages/InstructionsStep1.aspx

New York, https://www.elections.ny.gov/VotingRegister.html

North Carolina, https://www.ncsbe.gov/registering

North Dakota, https://vip.sos.nd.gov/PortalListDetails.aspx?ptlhPKID=73&ptlPKID=5

Registration not required

Ohio, https://olvr.ohiosos.gov/

Oklahoma, https://oklahoma.gov/elections/voter-info/register-to-vote.html

No online registration

Oregon, https://sos.oregon.gov/voting/Pages/registration.aspx?lang=en

Pennsylvania, https://www.pavoterservices.pa.gov/Pages/VoterRegistrationApplication.aspx

Rhode Island, https://vote.sos.ri.gov/Home/RegistertoVote?ActiveFlag=1

South Carolina, https://info.scvotes.sc.gov/eng/ovr/start.aspx?ref=voteusa_en

South Dakota, https://sdsos.gov/elections-voting/voting/register-to-vote/default.aspx

No online registration

Tennessee, https://sos.tn.gov/elections/guides/how-to-register-to-vote

Texas, https://www.votetexas.gov/register-to-vote/index.html

No online registration

Utah, https://voteinfo.utah.gov/learn-about-registering-to-vote/

Vermont, https://sos.vermont.gov/elections/voters/registration/

Virginia, https://www.elections.virginia.gov/registration/

West Virginia, https://ovr.sos.wv.gov/Register/Landing

Washington, https://voter.votewa.gov/WhereToVote.aspx

Washington, DC, https://vr.dcboe.org/213324797239968?agency_code=12&?ref=voteusa_en

West Virginia, https://ovr.sos.wv.gov/Register/Landing

Wisconsin, Register To Vote

Wyoming, https://sos.wyo.gov/Elections/State/RegisteringToVote.aspx

No online registration