- A 57-year-old SC man was fatally injured by a falling tree limb during the storm, Abbeville County Coroner Ronnie Ashley told CNN.
More than four million customers were without power throughout the state, according to Florida's Division of Emergency Management.
"(There are) major power outages - 250,000 out at this point", Jacksonville Mayor Lenny Curry said Monday. We've never had that many outages.
Massive cleanup: Mayor Bill Barnett says trees are down and streets are flooded, even though the storm surge wasn't as bad as officials feared.
Irma's top sustained winds are 35 miles per hour (55 kph), and it is moving northwest at 15 miles per hour (24 kph).
Rain and winds have subsided in Florida, but the state is still reeling from the storm's destruction.
Florida's largest utility reported that the storm had knocked out power to almost three-quarters of its customers.
"So when Irma took a turn to the west and went up the west side of the coast, you could hear a sigh of relief in the Florida market".
When the National Hurricane Center issues its 2 p.m. advisory, the center of Irma will most likely be out of Florida and into southwestern Georgia as a tropical storm. Its center hit portions of the Keys on Sunday but missed Miami and Naples, then skirted Tampa as the storm slowed. In Miami, streets were turned into rivers as water poured in from the storm surge, and construction cranes collapsed under the force of 180km/h winds. He made his way down to Florida last week ahead of Hurricane Irma.
"Over the past two years, we have witnessed the most intense hurricanes on record for the globe, both hemispheres, the Pacific and now, with Irma, the Atlantic", they wrote.
Crews continued to work to clear United States 1.
Scott said 65 percent of Florida was without power. That was enough power to knock down cell towers, damage roofs and uproot trees.
The storm killed at least 28 people as it raged through the Caribbean en route to Florida.
In Miami-Dade County, where roads flooded and debris flew, around three-quarters of residents (820,000 out of 1.1 million) are without power as of Monday.
Florida Power & Light CEO Eric Silagy said at a news conference that he expects full power restoration after the storm to take "multiweeks", as it did after the Category 5 Hurricane Andrew struck South Florida in 1992.
Tropical storm winds reached more than 400 miles from its centre, giving its powerful gusts and drenching rains a far reach. At least three storm-related deaths were reported in Georgia and one in SC.
Southbound US Route 1 - the only road connecting the Keys - is closed, Florida Keys spokesman Andy Newman said.
At least 26 people were arrested for burglary and looting Sunday night in Miami, and schools, airports and Orlando's DisneyWorld were on the list of closures.