"Helicopters, boats and swift water teams are going very heavily" to that area, McCrory said.
The latest confirmed victim was a 75-year-old man whose body was found in his car in an area of Gates County that was inundated by floodwaters, the state Emergency Operations Centre reported. The car was discovered when the floodwaters began to recede.
McCrory said the Federal Aviation Administration had issued temporary flight restrictions to keep the airspace over Lumberton clear for helicopters involved in rescue missions and pleaded with people not to send drones to the region.
Across the region, officials have also blamed Hurricane Matthew for six deaths in Florida, three in Georgia and one death each in Virginia and South Carolina. In the Caribbean, hundreds of deaths in Haiti have been attributed to the storm, and contaminated water is causing an outbreak of cholera there.