Castalia is a town located in Nash County, in the state of North Carolina (NC), United States. Nestled in the South Atlantic division of the South region, it covers an area of 0.7 square miles (2.0 km²) and sits at an elevation of 310 ft. With a population of approximately 340 residents, Castalia offers a peaceful, rural atmosphere.
The town's population is composed of about 49.41% males and 50.59% females, and it has a population density of 459.46 people per square mile (177.40/km²). Castalia lies at a latitude of 36.08 and a longitude of -78.06, operating in the UTC-5.
Locals reflect a blend of American ancestry, with roots primarily in United States (16.8%), followed by English (3.2%), German (3.5%), and Scotch-Irish (0%) heritage. The town is identified by the ZIP code 27816.