24378 -- U.S. ZIP code Municipality (1990): TROUT DALE, Virginia All ZIPs for this municipality (1990): 24378 Population (2000): 2405 Housing Units (2000): 859 Land area (2000): 77.879592 sq. miles (201.707209 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 77.879592 sq. miles (201.707209 sq. km) Located within: Virginia (VA) Location: 36.684567 N, 81.434116 W