61010 -- U.S. ZIP code Municipality (1990): BYRON, Illinois All ZIPs for this municipality (1990): 61010 Population (2000): 7139 Housing Units (2000): 2573 Land area (2000): 40.279706 sq. miles (104.323956 sq. km) Water area (2000): 0.022530 sq. miles (0.058353 sq. km) Total area (2000): 40.302236 sq. miles (104.382309 sq. km) Located within: Illinois (IL) Location: 42.131245 N, 89.266375 W