Officials in New York and New Jersey are scrambling to set up voting locations for areas hard hit by the storm.
Many polling stations are water logged or missing altogether.
Only 60 of the hundreds of regular polling places throughout New York City's five boroughs are up and running on Election Day.
To deal with the problem, the city has set up dozens of polling locations in 26 "supersites."
"About 175 polling places will be open," George Gilmore, chairman of the Ocean County Board of Elections, said.
"Some of those will have merged polling places. Ones that couldn't open, they've have been merged with others and we have a mobile bus that currently hit the shelter at High School North where people can come and vote," he said.
Meanwhile, long lines are expected at stations across the country.