20677 -- U.S. ZIP code Municipality (1990): PORT TOBACCO, Maryland All ZIPs for this municipality (1990): 20677 Population (2000): 1855 Housing Units (2000): 702 Land area (2000): 16.495359 sq. miles (42.722781 sq. km) Water area (2000): 0.006856 sq. miles (0.017757 sq. km) Total area (2000): 16.502215 sq. miles (42.740538 sq. km) Located within: Maryland (MD) Location: 38.501493 N, 77.031697 W