As the storm approached the Northeast over the weekend, airlines canceled more than 12,000 flights in the region.
Storm damage was projected at $10 billion to $20 billion, meaning it could prove to be one of the costliest natural disasters in U.S. history.
Sixteen deaths were reported in New Jersey, New York, Maryland, North Carolina, West Virginia, Pennsylvania and Connecticut. Some of the victims were killed by falling trees. At least one death was blamed on the storm in Canada.
President Barack Obama and Republican challenger Mitt Romney canceled their campaign appearances at the very height of the race, with just over a week to go before Election Day. The president pledged the government's help and made a direct plea from the White House to those in the storm's path.
Image: Water rushes into the Carey Tunnel (previously the Brooklyn Battery Tunnel), caused by Hurricane Sandy, October 29, 2012, in the Financial District of New York, United States.