62518 -- U.S. ZIP code Municipality (1990): CHESTNUT, Illinois All ZIPs for this municipality (1990): 62518 Population (2000): 468 Housing Units (2000): 195 Land area (2000): 24.894590 sq. miles (64.476690 sq. km) Water area (2000): 0.025207 sq. miles (0.065286 sq. km) Total area (2000): 24.919797 sq. miles (64.541976 sq. km) Located within: Illinois (IL) Location: 40.052320 N, 89.188329 W