20618 -- U.S. ZIP code Municipality (1990): BUSHWOOD, Maryland All ZIPs for this municipality (1990): 20618 Population (2000): 568 Housing Units (2000): 269 Land area (2000): 6.338463 sq. miles (16.416542 sq. km) Water area (2000): 0.010136 sq. miles (0.026253 sq. km) Total area (2000): 6.348599 sq. miles (16.442795 sq. km) Located within: Maryland (MD) Location: 38.270124 N, 76.791550 W