(CNN) -- A day after it launched a punishing strike on the East Coast of the United States, Superstorm Sandy remained a threat Tuesday.
The storm made landfall along the coast of southern New Jersey on Monday night, but its mammoth size affected a much wider area -- and continued to do so as it shuffled northward toward Canada, leaving at least 33 U.S. deaths in its wake.
Tuesday evening, nearly 6.9 million customers were without power in 15 states and Washington, according to the latest CNN estimate.
President Barack Obama signed disaster declarations for New York and New Jersey. He also 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 the United States and Canada.
CONNECTICUT
-- The death toll stands at two, according to state police spokesman Lt J. Paul Vance. The victims -- one of them a firefighter in Easton -- were killed by falling trees.
-- Some 500,000 customers were without power, according to utilities.
DELAWARE
-- Power went out for 17,000 customers, authorities said. Delmarva Power said it cannot predict how long it will take to restore power.
-- Gov. Jack Markell scaled back driving restrictions Tuesday morning.
DISTRICT OF COLUMBIA
-- Officials said 4,000 customers were without power.
-- Metro transportation bus and rail service was restored on modified schedules. The system expected normal service to resume for Wednesday morning's commute.
MAINE
-- About 33,000 homes and businesses were without electricity, according to Central Maine Power.
MARYLAND
-- Two people have died, an emergency management official said. A falling tree hit a house, killing a man inside. A car accident blamed on the storm accounted for the other death.
-- Raw sewage was leaking from a plant in Howard County, emergency management spokeswoman Karen Spicer said. About 2 million gallons of sewage per hour were pouring out of the Little Patuxent Water Reclamation Plant as a result of a power outage.
-- Utilities said 273,000 customers were without power.
-- A state of emergency remained in effect.
-- More than two feet of snow had fallen in Western Maryland, forecasters say.
MASSACHUSETTS
-- State employees returned to work Tuesday morning, according to the governor's office.
-- Utilities said 173,000 customers were without power.
-- Gov. Deval Patrick said utilities plan to pair tree removal and power restoration crews, rather than having them work separately, so that work can be done more efficiently.
NEW HAMPSHIRE
-- New Hampshire's power suppliers reported 107,000 customers without electricity.
-- Gov. John Lynch urged drivers to stay off roads.
-- The governor asked the National Guard to place 100 troops on active duty, with 100 more on standby.
NEW JERSEY
-- Sandy has killed at least six people in the Garden State, according to Gov. Chris Christie.
-- Obama will travel Wednesday to New Jersey to join the governor in viewing damage, talking with people recovering and thanking first responders, the White House said.
-- Amtrak service was to resume Wednesday between Newark and points south, between Harrisburg, Pennsylvania, and Philadelphia, and between Boston and Portland, Maine.
-- Emergency workers saw widespread damage on every New Jersey rail line.
-- A tidal surge stranded rail cars on the New Jersey Turnpike.
-- Houses sat in the middle of Route 35. The amusement pier at Seaside Park was half washed out, and amusement park rides were in the ocean.
-- PATH train service -- which typically ferries 245,000 people under the Hudson River to New York City each weekday -- will take seven to 10 days to restore, Christie said. New Jersey Transit train, bus and light rail service remain suspended, he said.
-- A dam or levee broke early Tuesday in the town of Moonachie, said Jeanne Baratta, chief of staff for the Bergen County executive, which handles operations for the county government. Rescues were under way in Moonachie, Little Ferry and Carlstadt, where 4 to 5 feet of water had flooded streets. People were standing on their roofs.
-- Sandy left 1.1 million customers without electricity.
-- Flooding was reported in portions of Atlantic City and Hoboken.
-- New Jersey Transit service was suspended indefinitely. Flooding also forced the closure of Newark Liberty International and Teterboro airports.
-- The Garden State Parkway in New Jersey was open, but more than 200 other state roads remained closed, Gov. Chris Christie said Tuesday in a Twitter message.
NEW YORK
-- Some airlines were to begin landing at John F. Kennedy International Airport at 10 p.m. Tuesday; the airport and Newark Liberty International Airport were to reopen Wednesday at 7 a.m. with limited service, Port Authority said. LaGuardia and Teterboro airports remained closed.
-- Sandy killed at least 15 people in New York, according to Gov. Andrew Cuomo.
-- New York City Mayor Michael Bloomberg said 18 people died in the city alone, but city and state officials later indicated that the numbers were fluid.
-- Among the dead was a 28-year-old off-duty police officer. Arthur Kasprzak was reported missing Monday night shortly after he had helped move six adults and a baby into the attic of his Staten Island home to escape rising waters, police said. Downed electric lines delayed a search until Tuesday morning, when he was found unconscious and unresponsive in the basement of the home, officials said. The cause of death had not been determined.
-- Amtrak said "unprecedented" flooding into its tunnels under the Hudson and East Rivers made it impossible to predict when service would be restored to Penn Station.
-- Bloomberg said more than 80 houses were lost in a fire in the Breezy Point section of Queens.
-- Outerbridge Crossing, George Washington, Goethals and Bayonne bridges were reopened, the Port Authority of New York and New Jersey said. The Tappan Zee Bridge, over the Hudson River, was opened, the governor's office said.
-- A record-setting power outage darkened a large Manhattan hospital, triggering a patient evacuation.
-- About 2.8 million customers were without power, suppliers said.
-- New York University Langone Medical Center went dark late Monday. More than 200 patients were evacuated after backup power failed, said hospital spokeswoman Lisa Greiner.
-- Water spilled into subway tunnels connecting Manhattan with Brooklyn and with Queens, said Metropolitan Transit Authority spokesman Aaron Donavan. The water will have to be pumped out. The subway system remained closed entirely, though limited bus service resumed Tuesday.
-- Two roadway tunnels linking Manhattan to the two boroughs took on water.
-- Obama declared a disaster in New York state, freeing federal funds for the counties of Bronx, Kings (Brooklyn), Nassau, New York, Richmond (Staten Island), Suffolk and Queens.
-- A crane atop a luxury Manhattan skyscraper under construction partly collapsed Monday, leaving its arm hanging over West 57th Street.
NORTH CAROLINA
-- The captain of HMS Bounty, a tall sailing ship used as a prop in classic adventure films, was missing after Hurricane Sandy forced the crew to abandon ship some 90 miles off Cape Hatteras. Two helicopter crews saved 14 people stranded in the Atlantic Ocean on Monday. A deckhand missing from the 180-foot ship was found dead, the Coast Guard said. The guard was searching for the missing captain about 125 miles southeast of Hatteras.
-- On Monday night, a 25-year-old driver died when a tree fell on his truck.
-- About 49,000 customers were without power.
-- Gov. Beverly Perdue declared a state of emergency for 24 counties in the western part of her state because of snow.
OHIO
-- High winds, flooding and snow have hit parts of the state.
-- Suppliers said 200,000 homes and businesses were without power.
PENNSYLVANIA
-- An 8-year-old boy struck by a tree limb in Susquehanna County was pronounced dead at a residence in Franklin Township, state police said.
-- Gerald Witman, 62, of Oley, was killed when a falling tree struck him, State Police spokesman David Beohm said.
-- Another person died in a traffic accident in Somerset County, Gov. Tom Corbett said.
-- Utilities said 1.1 million homes and businesses were without power.
-- Thirty-eight Pennsylvania counties were under emergency declarations, and 1,700 National Guard troops were on the ground, Corbett said.
RHODE ISLAND
-- The union's smallest state, with slightly more than 1 million residents, reported 85,000 customers without electricity. Outages were concentrated in the southern part of the state, affiliate WPRI-TV in Providence reported.
-- Few used public evacuation shelters. Widespread debris cluttered the roads, "but no casualties and relatively little alarm," WPRI said.
SOUTH CAROLINA
-- Power suppliers said 150 homes and businesses had no power.
VIRGINIA
-- Two storm-related traffic fatalities were reported by the Office of the Chief Medical Examiner. The deaths occurred in the state's central region.
-- Sandbags were piled inside restaurants in the Old Town section of Alexandria along the banks of the Potomac River.
-- The number of customers without power stood at 72,000.
WEST VIRGINIA
-- The state asked that only its essential state employees report to work Tuesday, the governor's office said.
-- A woman was killed when her car collided with a cement truck after the storm dumped 5 inches of snow on the town of Davis, authorities said.
-- West Virginia declared a state of emergency as Sandy dumped snow and rain in the Appalachian Mountains.
-- Utilities said 300,000 customers had lost power.
CANADA
-- An estimated 800 outages occurred across Ontario, affecting about 150,000 customers, the provincial energy minister said.
-- The hardest-hit Ontario communities were Toronto, Waterloo, Peterborough, Owen Sound and Sarnia. Authorities blamed flying debris for the death of a Toronto woman.
CNN's Maggie Schneider, Eden Pontz, Joe Sterling, Soledad O'Brien, Suzanne Malveaux, Mark Norman, Jason Kessler, George Howell, Jesse Solomon and Athena Jones contributed to this report.
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