20751 -- U.S. ZIP code Municipality (1990): DEALE, Maryland All ZIPs for this municipality (1990): 20751 Population (2000): 2237 Housing Units (2000): 960 Land area (2000): 3.409579 sq. miles (8.830768 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 3.409579 sq. miles (8.830768 sq. km) Located within: Maryland (MD) Location: 38.786949 N, 76.553355 W