61243 -- U.S. ZIP code Municipality (1990): DEER GROVE, Illinois All ZIPs for this municipality (1990): 61243 Population (2000): 244 Housing Units (2000): 93 Land area (2000): 25.092580 sq. miles (64.989481 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 25.092580 sq. miles (64.989481 sq. km) Located within: Illinois (IL) Location: 41.610151 N, 89.662981 W