63640 -- U.S. ZIP code Municipality (1990): FARMINGTON, Missouri All ZIPs for this municipality (1990): 63640 Population (2000): 22584 Housing Units (2000): 8478 Land area (2000): 200.493715 sq. miles (519.276316 sq. km) Water area (2000): 0.921117 sq. miles (2.385682 sq. km) Total area (2000): 201.414832 sq. miles (521.661998 sq. km) Located within: Missouri (MO) Location: 37.779206 N, 90.414048 W