"People aren't leaving their homes," said Staten Island resident Tara Saylor, 25. "They have no place to go."
More than 10,000 people across nine states spent Saturday night in shelters, American Red Cross spokeswoman Attie Poirier said. The Red Cross is sending 80,000 blankets to the region ahead of colder weather predicted this week.
The race, scheduled to run Sunday, was canceled for the first time in its history because of the storm.
Despite the cancellation, some runners decided to race anyway, "without any official support from the city and without diverting any resources," said CNN iReporter Talis Lin, who sent photographs from the course.
For many, keeping warm isn't simply a matter of turning on the heat, after Superstorm Sandy knocked out gas lines and electricity. Statewide in New York, 730,000 people were without power Sunday, Cuomo said. More than 2.2 million customers were without power across 15 states.
Among those still in the dark was New Jersey Gov. Chris Christie, who urged patience.
"I know it stinks. I still don't have power at my house. I'm not happy about it ... but it's the way it is," he said.
Less than a million households in New Jersey were without power Sunday, he said, down from 2.7 million soon after the storm.
Dropping temperatures are only one concern the region faces, with the presidential election only days away.
Election officials in New York City will temporarily relocate or combine some poll sites due to damage from Sandy, the Board of Elections said in a statement Sunday.
In New Jersey, Christie ordered early voting sites to offer extended hours through the weekend to encourage voters to make it to the polls.
For those who can't make it to their voting precincts, Christie ordered election officials to allow displaced New Jersey voters to cast their ballots electronically by submitting a mail-in ballot application via e-mail or fax. Once approved, the voter will be sent an electronic ballot that can, in turn, be e-mailed or faxed back to the county clerk.
The 900-mile-wide superstorm left a huge swath of damage when it hit the Northeast this week, claiming at least 110 lives in the United States and two in Canada after earlier killing 67 around the Caribbean.
Worst-hit New York state suffered 47 deaths, including 40 in New York City, authorities said. Half of those were in Staten Island.
Earlier, authorities in New York City reported 41 deaths, but determined later that one was not caused by the storm.
As communities grapple with the human toll, the price of the damage is stunning: between $30 billion and $50 billion, according to disaster modeling firm Eqecat. That far exceeds the firm's pre-storm estimate of $20 billion.
Officials said Sunday that relief was in sight for residents facing fuel shortages, with Defense Department plans to deliver generators and fuel to stations that need electricity and gasoline.
"We think things will be getting better. We know what a disaster this is," New York Sen. Charles Schumer said Sunday. "My wife waited two and half hours for gas yesterday and called me every half hour to see what I was doing about it, so this is an answer to her as well as to every New Yorker."
Meanwhile, Bloomberg said he plans to take the subway on Monday, a sign that transit is coming back.
New York City students will also go back to school Monday, Bloomberg said. Some students will be bused to other locations if their schools have been damaged and cannot reopen.
Adding to concerns, a storm is forecast for the region this week.
"As we have this nor'easter coming ... we have to remain extremely vigilant about our neighbors," New York Sen. Kirsten Gillibrand said Sunday.
While many residents are seeking disaster relief help from federal and state officials, she said, some of the state's seniors may be afraid to leave their homes, even if they don't have heat. And they may not know what resources are available.
"What I'm most concerned about right now are the people we haven't met and we haven't seen," she said.