At least 11 storm-related deaths have been confirmed, and officials expect that number to rise.
Much of the Florida Panhandle looks like a battlefield, with homes and businesses reduced to rubble.
Search and rescue teams are combing through the wreckage in Mexico Beach, where Michael came ashore with 155 mile-per-hour winds.
More than 1.5 million people are now without power, and officials say the infrastructure is so damaged in some areas that it could take weeks to restore electricity.