Castle Hayne is a census-designated place in New Hanover County, North Carolina, United States. The population was 1,202 at the 2010 census, up from 1,116 in 2000. It is part of the Wilmington Metropolitan Statistical Area. The forest provided the region's major industries through the 18th and most of the 19th century: naval stores and lumber fueled the economy both before and after the American Revolution.