Jefferson County residents who are eligible may pick up a mail in voter registration application or receive assistance with self-registering online at the library during regular business hours.
The printable online form for registering to vote in Jefferson County can be found here: http://www.sos.mo.gov/cmsimages/ElectionGoVoteMissouri/register2vote/Jefferson.pdf
You will need to print it out and mail it in to the County Election Authority.
Absentee Voting in Missouri
The Missouri Secretary of State's Office provides a printable absentee ballot request form along with all of the information needed to vote absentee if you are unable to visit your polling place on election day.
Voter Information - Missouri Secretary of State's Office
Guidelines for absentee voting in Missouri, legislative district maps, candidate information are just some of the election / voting information to be found here.
Federal Election Commission
The Federal Election Commission (FEC) administers and enforces the Federal Election Campaign Act (FECA) - the statute that governs the financing of federal elections. This site covers information about campaigns, elections and voting.