Marshallberg is an unincorporated area and census-designated place (CDP) in Carteret County, North Carolina, United States. As of the 2010 census, it had a population of 403.^[4] It lies on the mainland, directly across Core Sound from Harkers Island and Cape Lookout beyond that. Lying at the extreme southeast corner of a peninsula, it is isolated from other Carteret County communities and only a single road connects it to the rest of the state.

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Marshallberg, North Carolina
Census-designated place
Marshallberg
Coordinates: 34°43′36″N 76°30′54″W
Country	United States
State	North Carolina
County	Carteret
Area [1]
• Total	0.65 sq mi (1.68 km2)
• Land	0.64 sq mi (1.65 km2)
• Water	0.01 sq mi (0.03 km2)
Elevation [2]	3 ft (0.9 m)
Population  (2020)
• Total	341
• Density	535.32/sq mi (206.69/km2)
Time zone	UTC-5 (Eastern (EST))
• Summer (DST)	UTC-4 (EDT)
ZIP code	28553
Area code	252
FIPS code	37-41600[3]
GNIS feature ID	2628643[2]

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Marshallberg is located east of the center of Carteret County, bounded on the east by Core Sound, on the south by The Straits, on the west by Sleepy Creek, and on the northeast by Great Marsh Creek. The community of Gloucester is to the west across Sleepy Creek. The town of Beaufort is 7 miles (11 km) to the west by water and 15 miles (24 km) by road.

The Marshallberg CDP has a total area of 0.66 square miles (1.7 km²), of which 0.01 square miles (0.02 km²), or 0.97%, is water.^[4]