Have you moved recently? With the enactment of new voting laws, current Missouri residents now have more flexibility to update their address and register to vote. New Missouri residents and those who have not previously registered to vote are required to register four weeks before an election. If you have moved from another Missouri address, you can update your address prior to Election Day, or on Election Day, you can go to the Election Authority office, update your address, and vote the same day. Register to vote or update your address online.