25143 -- U.S. ZIP code Municipality (1990): NITRO, West Virginia All ZIPs for this municipality (1990): 25143 Population (2000): 8324 Housing Units (2000): 3912 Land area (2000): 10.201045 sq. miles (26.420583 sq. km) Water area (2000): 0.100426 sq. miles (0.260101 sq. km) Total area (2000): 10.301471 sq. miles (26.680684 sq. km) Located within: West Virginia (WV) Location: 38.417852 N, 81.832109 W