(CNN) -- As Irene swirled its way northward Sunday, it flooded low-lying areas, knocked out power and grounded thousands of flights in airports, including New York City and Philadelphia.

President Barack Obama declared states of emergency for North Carolina, Virginia, New Jersey, New York, Connecticut, Rhode Island, Massachusetts, New Hampshire, Delaware, the District of Columbia and Puerto Rico to provide federal aid for recovery efforts after the storm passes.

Here are reports from the states most affected by Irene, which weakened to a tropical storm Sunday:

LATEST DEVELOPMENTS

VERMONT

-- Parts of Montpelier were evacuated and people were told to stay off the roads.

-- Conditions in parts of southern Vermont are "awful" due to significant flooding, said state emergency management spokesman Mark Bosma.

-- "Some small towns were entirely covered with water, we got reports of people stranded at schools and in cars," Bosma said. "One woman was swept away in a river. Water is pretty much everywhere."

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Despite being bordered on all sides by land, Vermonters struggled Sunday with the impacts of Irene as fast-moving floods swarmed towns from Brattleboro to Woodstock and beyond. Officials in Montpelier warned that "a major emergency is on the horizon" in the state's capital.

CONNECTICUT

-- Upwards of 750,000 customers lost electricity because of the storm, which utility Connecticut Light and Power said set an "all-time record for power outages," state emergency management spokesman Scott Devico said. Electricity could return for some as soon as Monday, though for others it could remain out a week or more, he added.

-- He said state police were reporting one fatality that appeared to be related to the storm. "It does appear, through the initial report, that it is related to downed wires," he told reporters. Three people are missing, the governor said.

-- One man has been reporting missing in river-waters in the inland town of Bristol, while two individuals are unaccounted for in East Haven, where authorities do not know the whereabouts of a pair whose home was swept away by the sea, said Devico.

-- "We have a lot of streams and rivers that are over their banks," Malloy said. "We hope it's going to get better in the not-too-distant future."

-- With power outages worse than after Hurricane Gloria in 1985, "there is precious little to celebrate, except that we had very little loss of life," Malloy said Sunday.

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Connecticut faced widespread power outages after Irene ripped through the state. The storm reportedly killed one person, but there were no immediate reports of extensive damage.

DELAWARE

-- About 525,000 households are currently without power, state spokeswoman Kathy Ross said Sunday.

-- The National Hurricane Center said water levels along the New Jersey and Delaware coasts, including Delaware Bay, will subside Sunday.

-- The state had "lots to do to respond, recover & repair," Gov. Jack Markell tweeted.

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Delaware appeared to have been spared the worst of the storm, which caused widespread power outages. Officials were assessing damage to coastal areas Sunday. The governor lifted mandatory evacuation orders, though some communities, especially along the Delaware Bay in Sussex and Kent counties, remained inaccessible due to flooding.

DISTRICT OF COLUMBIA

-- Mayor Vince Gray tweeted that the Metrorail system was "open & operating normally on a Sunday schedule."

-- Gray was taking an assessment tour to see damage in the city.

-- There were downed trees and power lines. Officials urged caution.

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The nation's capital was similarly spared the worst of the storm. Downed trees and power lines littered the city, though the Metrorail system was running as usual Sunday and no deaths were reported.

MAINE

-- Numerous shelters remained open in the state Sunday.

-- The Penobscot Narrows Bridge Observatory is expected to reopen at 9 a.m. Tuesday. Storm covers had been installed in hopes of preventing water from getting in during the storm.

MARYLAND

-- About 822,000 households, an estimated 657,000 people, are out of power due to storm conditions in Maryland, state management officials said.

-- A nuclear power reactor automatically went offline late Saturday in Calvert Cliffs after its main transformer was hit by a piece of aluminum siding that Hurricane Irene had peeled off a building, said Mark Sullivan, spokesman for the Constellation Energy Nuclear Group said. All employees were safe.

-- While the storm had dumped 12 inches of rain by early morning, there was no major flooding in Ocean City. Some sections of the city were without power, and officials stopped sending vehicles to respond to 911 calls after winds topped 50 mph.

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No major storm-related damage was immediately reported in Maryland though Irene left more than 600,000 people without power. Heavy rains hammered the state.

MASSCHUSETTS

-- Boston's Massachusetts Bay Transportation Authority has suspended all its transit services for Sunday.

-- Emergency shelters were open Saturday night at six Cape Cod high schools, four sites on Nantucket and Martha's Vineyard and four sites elsewhere in Massachusetts, the state's emergency management agency announced.

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Irene pounded the coast of Massachusetts Sunday and left more than 600,000 people in the state without power. As the eye of the storm passed, concern turned towards inland rivers and waterways, swollen by heavy rain.

NEW HAMPSHIRE

-- Gov. John Lynch said New Hampshire was under a state of emergency and urged residents to heed emergency officials' warnings to stay off roads, beaches and waterways on Sunday.

-- He urged residents to stay inside until after the storm ends after several people were seriously injured by flying tree limbs while cleaning up debris.

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Irene blew through New Hampshire,

NEW JERSEY

-- Some 3,000 workers from New Jersey's transportation department and sister agencies worked Sunday to clear debris and address flooding in more than 300 locations around the state, according to the department.

-- The evacuation of more than a million people ahead of the storm saved lives, said Gov. Chris Christie. He predicted more flooding as rivers crest Monday and Tuesday.

-- Search-and-rescue crews will check shore properties "to make sure the folks who remained are safe and sound."

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A good news/bad news scenario emerged in New Jersey in the aftermath of Irene, with an orderly evacuation preventing possible catastrophe along the coast but torrential rains setting up record inland flooding in the next 48 hours, the governor said Sunday. Before heading off in a helicopter to survey the affected areas, Christie warned of "a major flooding incident" in the next two days from both the swollen rivers and dams considered at risk.

NEW YORK

-- The Federal Aviation Administration announced that the area's three major airports -- Newark Liberty in northern New Jersey and LaGuardia and John F. Kennedy in the New York City boroughs of Queens -- will reopen Monday, two days after they shut down.

-- Billie Jean King National Tennis Center, the venue for the U.S. Open tournament, suffered "minimal damage" when Hurricane Irene roared through New York, and workers were getting the site ready for an 11 a.m. ET Monday start, the United States Tennis Association said in a statement on its website.

-- Limited bus service was restored in New York City Sunday afternoon. Metropolitan Transportation Authority crews reported widespread impacts after the storm, including track and yard flooding, downed trees and power outages.

-- New York City officials at 3 p.m. Sunday lifted the evacuation order for residents in "Zone A" low-lying coastal areas around the city as well as the Rockaways, after the worst of what is now Tropical Storm Irene had passed.

-- "The good news is the worst is over and we will soon move to restore-and-return mode," said Mayor Mike Bloomberg, who added that there was no report of deaths or injuries from the storm.

-- Low-lying areas of all five boroughs were flooded, he said.

-- City government offices and the financial markets will reopen Monday.

-- Though tunnels under the East River did not flood, as had been feared, the nation's largest transportation system will not resume service until the tracks have been walked and repairs made, said MTA Chairman and CEO Jay Walder.

-- The three Metro North lines were all flooded and "may well have sustained the worst damage," including erosion of the track beds, he said.

-- Gov. Mario Cuomo said Sunday that 905, 334 customers do not have electricity as a result of Irene.

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Irene swept through New York City Sunday, sparing the area the worst of what many had feared. Still, officials said they were concerned about flooding from heavy rains that could affect electrical systems and other infrastructure that is largely underground in New York. The storm toppled trees, knocked out power and flooded low-lying areas of all five boroughs. Mayor Mike Bloomberg reported no deaths or injuries from the storm.

NORTH CAROLINA

-- Pounding surf washed over dunes, covering roads with water and sand. The flooding left about 2,500 people stranded Sunday on Hatteras Island in the Outer Banks.

-- Authorities had closed more than 200 roads and 21 bridges across the state as they assessed damage Sunday.

-- Irene made landfall in North Carolina on Saturday, leaving a trail of destruction. Six people died in storm-related incidents in the state.

-- By early Sunday, the hurricane had dumped 10 to 14 inches of rain on much of North Carolina. As of midnight Saturday, Kill Devil Hills, North Carolina, had endured 31 hours of nonstop rainfall.

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Irene cut a path of destruction in North Carolina, where the storm first made landfall in the United States. It tore off roofs, toppled trees, induced flooding near the coast and brought down power lines, according to the state emergency management division. Six people were killed in storm-related incidents.

PENNSYLVANIA

-- Four people died in Pennsylvania as a result of Irene, Ruth Miller, a spokeswoman for the Pennsylvania Emergency Management Agency, said Sunday. About 382,200 people were without power, she said.

-- The state of emergency for Philadelphia was lifted at noon Sunday, officials said. Mayor Michael Nutter said officials were trying to get the city "back in operation."

-- In Darby, water was up to the level of street signs, and there there are "couches, furniture all kinds of stuff floating down the street," according to Nutter.

-- The storm came during the wettest month in the history of Philadelphia, so the ground was already saturated.

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Irene moved out of Pennsylvania, leaving in its wake four deaths, downed power lines and high waters. The state largely escaped the storm's wrath, however, and officials worked Sunday to get Philadelphia "back in operation."

RHODE ISLAND

-- In Rhode Island, an estimated 155,377 are without power, a spokesperson with Gov. Lincoln Chafee's office said Sunday.

-- With widespread power outages, "pretty much every community is affected," said Christine Hunsinger, spokeswoman for the Rhode Island Emergency Management Agency.

-- Hunsinger said several hundred people have taken advantage of shelters, and, "we did see a lot of cooperation in the mandatory evacuation zones."

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Irene knocked down trees and toppled power lines in the nation's smallest state. No deaths were reported.

VIRGINIA

-- The storm left four people dead and knocked out power to about 1.1 million people, Gov. Bob McDonnell told reporters Sunday afternoon.

-- Some parts of inland southern Virginia saw 16 inches of rain, while top winds were clocked at 83 mph as the storm scoured the Virginia coast on Saturday.

-- Some 38 U.S. Navy ships -- including 27 that were based out of Norfolk -- were at sea to minimize the impact from Hurricane Irene. This represents 13% of the U.S. Navy's deployable battle force ships.

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Though the worst of the storm has passed, Virginia's governor urged residents Sunday to take caution in the aftermath of Irene. Four people were killed in the state by falling trees, including an 11-year-old boy. Flooding, downed power lines and debris still posed hazards to people moving around.

CNN's Tom Cohen, Alexander Hunter, Phil Gast, Greg Botelho, Stephanie Gallman, Kristina Sgueglia, Chris Boyette and Rich Phillips contributed to this report.