The storm officially made landfall along the coast of southern New Jersey Monday night, but it is affecting a much wider area.
At least 29 people have died in the United States.
President Barack Obama has signed disaster declarations for New York and New Jersey. He has signed emergency declarations for other states and the nation's capital.
Nearly 11,000 people spent Monday night in scores of Red Cross-operated shelters in the hard-hit mid-Atlantic region.
Here's a look at how Sandy has affected U.S. states and Canada.
-- The death toll stands at two, according to state police spokesman Lt J. Paul Vance. The two victims -- one of them a firefighter in Easton -- were killed by falling trees.
-- Utilities said 627,870 customers were without power.
-- Power went down for 69,345 customers in Delaware, authorities said. Delmarva Power reported it cannot assess the time it will take to restore power because of the intensity of the storm.
-- Delaware Gov. Jack Markell scaled back driving restrictions Tuesday morning.
DISTRICT OF COLUMBIA
-- Washington officials said 22,121 customers were without power.
-- Washington's Metro will restore bus and rail service on most lines using a Sunday schedule beginning at 2 p.m. ET Tuesday. Normal service is expected to resume for Wednesday morning's commute.
-- About 88,332 homes and businesses are without electricity, according to Central Maine Power. Around 1,000 workers will begin repairing lines early Tuesday.