Coordinates: 34°56′N 77°56′W / 34.94°N 77.93°W
Duplin /ˈduːplɪn/ County is a county located in the U.S. state of North Carolina. As of the 2010 census, the population was 58,505. Its county seat is Kenansville.
The county was formed in 1750 from New Hanover County. It was named for Thomas Hay, Viscount Dupplin, later 9th Earl of Kinnoull.
In 1784 the western part of Duplin County became Sampson County.
One of Duplin's favorite sons, John Miller, was a postmaster and merchant in Duplin. He migrated to Leon County, Florida, with other North Carolinians in the 1830s-1840s and established a successful cotton plantation called Miccosukee Plantation.
According to the U.S. Census Bureau, the county has a total area of 822 square miles (2,130 km2), of which 816 square miles (2,110 km2) is land and 5.5 square miles (14 km2) (0.7%) is water.