63621 -- U.S. ZIP code Municipality (1990): ARCADIA, Missouri All ZIPs for this municipality (1990): 63621 Population (2000): 1222 Housing Units (2000): 618 Land area (2000): 79.501916 sq. miles (205.909009 sq. km) Water area (2000): 0.091639 sq. miles (0.237343 sq. km) Total area (2000): 79.593555 sq. miles (206.146352 sq. km) Located within: Missouri (MO) Location: 37.520078 N, 90.616942 W