Reply Sparta residents can vote in the June 8 primary at in-person polling locations. (Shutterstock) SPARTA, NJ — When voting in Sparta, here's the best way to find out how to cast your ballot, depending on whether you've opted for a mail-in or in-person voting method. Township voters may drop their ballots off early or up to the designated time on Election Day by mail, in a drop box or at the Sussex County Board of Elections. If a resident would like to vote in the primary in person, they will need to go to their designated polling location. For Sussex County Mail-In Voting By The Post Office, Drop Box Or County Board Of Elections