20733 -- U.S. ZIP code Municipality (1990): CHURCHTON, Maryland All ZIPs for this municipality (1990): 20733 Population (2000): 2810 Housing Units (2000): 1072 Land area (2000): 3.424051 sq. miles (8.868252 sq. km) Water area (2000): 0.032116 sq. miles (0.083181 sq. km) Total area (2000): 3.456167 sq. miles (8.951433 sq. km) Located within: Maryland (MD) Location: 38.801516 N, 76.524691 W