There was continued disruption to transport links in the Mid-Atlantic region after many airports had closed.
A record 32.4in snowfall was measured at Dulles International Airport over the weekend, breaking the previous two-day storm record by almost 10in.
Neighbouring Maryland recorded 3ft of snow.
In Philadelphia, 28.5in of snow fell during the storm, just shy of the record 30.7in during the January 1996 blizzard.
The National Weather Service is predicting the city will be hit by another 12-18in from Tuesday, which could make this winter the snowiest since Philadelphia started keeping records in 1884.
Electricity was cut to at least 300,000 homes as snow felled trees, and cut power lines across the region. Another 250,000 customers were hit by blackouts in Pennsylvania and New Jersey, the New York Times reported.
Even President Barack Obama fell victim to "snowmageddon", as locals - including the president - have dubbed it.
More than 1ft of snow has fallen only 14 times since 1870
Heaviest on record is 28in in January 1922
Worst snowfall is believed to have hit in 1772, before records began, with as much as 3ft
A tree limb snapped and fell on to a vehicle in Mr Obama's motorcade, but no-one was injured.
All across the region, hundreds of car accidents were reported, but only two fatalities - a father and son who died while helping another motorist in Virginia.
The latest falls come less than two months after a storm dumped more than 16in of snow in Washington.
On Monday, the Washington Metro was still only operating on underground lines. Bus services were partly restored after having been cancelled most of the weekend.
The usually traffic-heavy roads of the capital were deserted, and the city's famous sites and monuments were covered with snow.
Debi Adkins, who lives just outside the city of Baltimore, told the BBC: "I'm not going anywhere - I couldn't if I wanted to. You just can't get your cars out. The front door of the building I live in is closed shut, so I just can't get out."
Some sightseers ventured out in thigh-deep snow in the National Mall park, or went cross-country skiing down empty boulevards.
Others took part in a huge snowball fight at Washington's DuPont Circle, organised via Facebook and Twitter.
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