The action makes federal funding available to affected individuals in 10 counties hit by the storm, the White House said in a statement.
The storm knocked out power to almost 1.6 million households and businesses in the US Southeast.
The stretch of the Atlantic coast from Miami to Charleston, a nearly 600-mile drive, encompasses some of the most well-known beaches, resorts and historical towns in the southeastern United States.
Parts of Interstate 95, the main north-south thoroughfare on the East Coast, were closed due to flooding and fallen trees, state officials said.
In pictures: Hurricane Matthew
In Florida, 775,000 were without power, according to state utilities, while in South Carolina 433,000 had no electricity, Governor Nikki Haley said. Georgia Power said at least 275,000 were without power in the state.
Roads in Jackson Beach, Florida, were littered with wood, including sections of a historic pier, and foot-deep, water-clogged intersections. Beachfront businesses suffered moderate damage.
“We rode out the storm. It wasn’t this bad at our house, but here there’s a lot of damage,” said Zowi Cuartas, 18, as he watched people pick up shattered signs near the beach. “We were prepared to lose our house.”
Governor Rick Scott of Florida said more than 6,000 people stayed in shelters overnight, but he appeared relieved at a news conference on Saturday the storm had not done more harm.
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