If you are already a registered voter in your state and only need to "request a ballot", your deadline may be extended. Deadlines are listed in the State-specific Voter Information Directory on this website - click the link in the left sidebar.
Whether you are registering to vote, or requesting a ballot - you must still complete and send in the same registration/ballot request form. Click into the Register to Vote/Request a Ballot process on this website.
Please, never assume your ballot will arrive without refiling.