| 8/5/2020 | First day for any registered voter within the confines of the United States to make application by mail or in person for an official vote by mail ballot |
| 9/18/2020 | Last day for the election authority to have sufficient number of ballots available for mailing to persons in the U.S. service or their spouses and voting age dependents, citizens temporarily residing outside the territorial limits of the U.S. and nonresident civilians |
| 9/24/2020 | First day for election authority to mail an official ballot to voters who have requested one |
| 9/24/2020 | First day for early voting at the office of the election authority & temporary locations |
| 10/6/2020 | Last day for registration or transfer of registration within the offices of the election authority |
| 10/7/2020 | First day for grace period registration, voting or change of address in the office of the election authority or at a location designated for this purpose |
| 10/18/2020 | ONLINE VOTER REGISTRATION Last day for voters to register to vote through the State Board of Elections website. (10 ILCS 5/1A-16.5) |
| 10/19/2020 | First day of early voting for counties who have early voting at permanent polling places other than the office of the election authority |
| 10/26/2020 | Last day for any voter who is a member of the U.S. service or their spouses, voting age dependents, nonresident civilian and citizens temporarily residing outside the U.S. to make application for an absentee ballot |
| 10/29/2020 | Last day for the election authority to receive application by mail from any registered voter |
| 11/2/2020 | Last day for early voting |
| 11/3/2020 | Last day for grace period registration and voting |