Rescue teams were still trying to reach some Bahamian communities isolated by floodwaters and debris after the disaster that killed at least 43 people.
Prime Minister Hubert Minnis called it an "hour of darkness" for the Bahamas.
The hurricane hit Abaco on Sunday and then hovered over Grand Bahama for a day and a half.
At least 20 people are dead in the Bahamas after the record-breaking storm pounded the islands for days.
The massive storm gained strength once again late Wednesday as it took aim at the Carolinas.
More than 600 police officers and marines fanned out across the Bahamas, where Hurricane Dorian made landfall, to reach stranded victims.
At least seven people have died and 21 are injured as the now Category 3 hurricane continues flooding the Bahamas.
Florida residents are bracing for the Category 4 storm to hit them next.
The 185 mph winds ripped off roofs, overturning cars and tore down power lines.