62515 -- U.S. ZIP code Municipality (1990): BUFFALO HART, Illinois All ZIPs for this municipality (1990): 62515 Population (2000): 1010 Housing Units (2000): 422 Land area (2000): 67.607905 sq. miles (175.103662 sq. km) Water area (2000): 0.007829 sq. miles (0.020277 sq. km) Total area (2000): 67.615734 sq. miles (175.123939 sq. km) Located within: Illinois (IL) Location: 39.861289 N, 89.378365 W