The Coast Guard said it rescued at least 27 people before and after the hurricane came ashore, mostly from homes along the Florida coastline, and searched for more victims.
Eight ships from Tampa, Miami and Galveston in Texas had to be re-routed from the path of Michael, but all three ports are operating normally again and each of Royal Caribbean, Carnival and Norwegian Cruise Line say passengers for the next cruises will not be affected.
The storm mangled buildings, toppled trees and covered roads in water.
FCC Chairman Ajit Pai said in a statement that he was working with providers to restore service and was happy with their responses so far.
The FCC will be updating its outage map daily.
More than 830,000 homes and businesses were without power in Florida, Alabama and Georgia early Thursday.
Six people are reported to have died since the category four storm hit Florida early on Thursday, but this number is expected to rise as rescue efforts continue. Aluminum siding was shredded to ribbons. Both were killed when trees crashed onto their homes.
Four other people were killed in Florida, including one man who was killed by a falling tree. "We thought the windows were going to break at any time", Beu said. Twisted street signs lay on the ground.
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In Panama City, buildings were crushed, tall pine trees were sent flying and a steeple was knocked off a church.
In Seminole County, Georgia, a metal car-shelter lifted by a gust of wind hit a mobile home, killing a girl of 11. One of the carport's legs punctured the roof and hit her in the head.
"If Hurricane Michael moves that algae onto land, it gets spread out, it doesn't get sustained", Frank Muller-Karger, professor of biological oceanography at the University of Maryland, told Bloomberg.
The Carolinas are still recovering from the floods of Hurricane Florence.
Michael also disrupted energy operations in the U.S. Gulf of Mexico as it approached land, cutting crude oil production by more than 40 percent and natural gas output by almost one-third as offshore platforms were evacuated.
"Why people didn't evacuate is something we should be studying", said Craig Fugate, former director of the Federal Emergency Management Agency and a former Florida state emergency management chief.
Based on its internal barometric pressure, Michael was the third most powerful hurricane to hit the United States mainland, behind the unnamed Labour Day storm of 1935 and Camille in 1969.