Here are some key cities and counties in four states that will play a crucial role in determining the winner. These states and municipalities will also be closely watched for how they handle what is expected to be historic turnout, including unprecedented numbers of mail ballots. Of course, not all will swiftly meet the surge of mail ballots. Florida and Arizona, for example, will begin counting those ballots well before Election Day, and are expected to report results more quickly. Pennsylvania and Michigan cannot begin counting until Election Day.

Source: New York Times September 26, 2020 16:41 UTC