10543 -- U.S. ZIP code Municipality (1990): MAMARONECK, New York All ZIPs for this municipality (1990): 10543 Population (2000): 19427 Housing Units (2000): 7547 Land area (2000): 4.247567 sq. miles (11.001148 sq. km) Water area (2000): 0.003122 sq. miles (0.008086 sq. km) Total area (2000): 4.250689 sq. miles (11.009234 sq. km) Located within: New York (NY) Location: 40.952892 N, 73.734600 W