These sources should answer all of your voting in Wisconsin questions:
MyVote Wisconsin – This site will allow you to check to see if you are registered, update your name or address information, find your polling place, a list of elected officials and find what will be on the upcoming ballot.
Wisconsin Elections Commission – State entity charged with overseeing all election activity in WI. Includes information on special voting information such as homelessness, incarceration or hospitalization.
Jefferson County Wisconsin Voting Information – Information on voting as well as running for office.