"We ask evacuees to be patient as we begin recovery", the county tweeted Thursday.
Brad Rippey, a meteorologist for the US Agriculture Department, said Michael severely damaged cotton, timber, pecans and peanuts, causing estimated liabilities as high as $1.9bn and affecting up to 1.5 million hectares.
Gov. Roy Cooper in a morning briefing with reporters emphasized that the former hurricane remains a unsafe storm, even though most of its destructive power has been spent in Florida, Georgia and Alabama.
Over 900 000 homes and businesses in Florida, Alabama, Georgia and the Carolinas were without power.
Craig Fugate, former director of the Federal Emergency Management Agency and a former emergency management chief for the state of Florida, said "this is what we expect with storm surge and high wind events".
Gulf Coast Regional Medical Center in hard-hit Panama City, 32 km northwest of Mexico Beach, was treating some of the injured.
With winds of 155mph and a storm surge of nearly 14 feet, the hurricane has left a trail of destruction more than 100 miles wide at its immediate point of impact and stretching in excess of 200 miles inland into southern Georgia, where it finally subsided into a rain-heavy tropical storm.
Michael made landfall near Mexico Beach, about 20 miles southeast of Panama City in Florida's Panhandle region on Wednesday afternoon.
Many residents with destroyed or damaged homes counted themselves lucky to have survived.
Footage of a Waffle House in Panama City, that was damaged after a large pole fell on top of it during Hurricane Michael.
The storm mangled buildings, toppled trees and covered roads in water.
Apalachicola Mayor Van Johnson said: "There are so many downed power lines and trees that it's nearly impossible to get through the city". Entire roofs were torn away and dropped onto a road. Aluminum siding was shredded to ribbons. Twisted street signs lay on the ground. Homes were split open by fallen trees.
A pine tree broke a hole in their roof and his ears popped when the barometric pressure plummeted.
More than 375,000 people up and down the Gulf Coast were ordered or urged to evacuate as Michael closed in.
Based on its internal barometric pressure, Michael was the third most powerful hurricane to hit the USA mainland, behind the unnamed Labor Day storm of 1935 and Camille in 1969. Based on wind speed, it was the fourth-strongest, behind the Labor Day storm (184 miles per hour, or 296 kph), Camille and Andrew in 1992.