61411 -- U.S. ZIP code Municipality (1990): ADAIR, Illinois All ZIPs for this municipality (1990): 61411 Population (2000): 419 Housing Units (2000): 190 Land area (2000): 38.023879 sq. miles (98.481391 sq. km) Water area (2000): 0.016281 sq. miles (0.042167 sq. km) Total area (2000): 38.040160 sq. miles (98.523558 sq. km) Located within: Illinois (IL) Location: 40.401282 N, 90.501531 W