The vast majority of states, and the District of Columbia, let all voters track their mail-in ballots – click on each state for a link to its online ballot-tracking system. In the remaining states, some counties and municipalities may have their own systems, which are not included here. Two states only allow statewide online ballot tracking for military service members or overseas voters. Four states do not have statewide online tracking of mailed ballots, though they may have other ways for military and overseas voters to determine whether their ballots have been received, as is required by federal law.