62684 -- U.S. ZIP code Municipality (1990): BARCLAY, Illinois All ZIPs for this municipality (1990): 62684 Population (2000): 3739 Housing Units (2000): 1311 Land area (2000): 24.189710 sq. miles (62.651058 sq. km) Water area (2000): 0.058406 sq. miles (0.151271 sq. km) Total area (2000): 24.248116 sq. miles (62.802329 sq. km) Located within: Illinois (IL) Location: 39.901588 N, 89.588053 W