61957 -- U.S. ZIP code Municipality (1990): WINDSOR, Illinois All ZIPs for this municipality (1990): 61957 Population (2000): 1870 Housing Units (2000): 811 Land area (2000): 66.755287 sq. miles (172.895391 sq. km) Water area (2000): 0.004383 sq. miles (0.011351 sq. km) Total area (2000): 66.759670 sq. miles (172.906742 sq. km) Located within: Illinois (IL) Location: 39.434148 N, 88.600338 W