61465 -- U.S. ZIP code Municipality (1990): NEW WINDSOR, Illinois All ZIPs for this municipality (1990): 61465 Population (2000): 1144 Housing Units (2000): 500 Land area (2000): 36.424734 sq. miles (94.339625 sq. km) Water area (2000): 0.017277 sq. miles (0.044748 sq. km) Total area (2000): 36.442011 sq. miles (94.384373 sq. km) Located within: Illinois (IL) Location: 41.200936 N, 90.456310 W