61474 -- U.S. ZIP code Municipality (1990): SAINT AUGUSTINE, Illinois All ZIPs for this municipality (1990): 61474 Population (2000): 355 Housing Units (2000): 155 Land area (2000): 29.324871 sq. miles (75.951063 sq. km) Water area (2000): 0.013729 sq. miles (0.035559 sq. km) Total area (2000): 29.338600 sq. miles (75.986622 sq. km) Located within: Illinois (IL) Location: 40.740729 N, 90.379460 W