21619 -- U.S. ZIP code Municipality (1990): CHESTER, Maryland All ZIPs for this municipality (1990): 21619 Population (2000): 5325 Housing Units (2000): 2398 Land area (2000): 9.473968 sq. miles (24.537464 sq. km) Water area (2000): 0.010212 sq. miles (0.026449 sq. km) Total area (2000): 9.484180 sq. miles (24.563913 sq. km) Located within: Maryland (MD) Location: 38.949536 N, 76.280638 W