More than 1,85,000 homes were damaged and 9,000 destroyed as 42,000 people remain in shelters amid overflowing rivers and reservoirs, Texas officials said.
A state of emergency has been declared in New York, New Jersey, Connecticut, Rhode Island, Massachusetts and New Hampshire.
Rescue work has intensified in Texas with officials launching search operations as desperate residents remain stranded without food and water.
A life-threatening blizzard which is expected to pound a record 30 inches of snow has hit most part of the US' east coast.
States across America are beginning the process of digging their way out of record-breaking snowfall on Monday after Winter Storm Jonas battered the nation's East Coast, wreaking havoc on millions and turning major cities into ghost towns.