Macon -- U.S. County in Illinois Population (2000): 114706 Housing Units (2000): 50241 Land area (2000): 580.522695 sq. miles (1503.546813 sq. km) Water area (2000): 4.855319 sq. miles (12.575217 sq. km) Total area (2000): 585.378014 sq. miles (1516.122030 sq. km) Located within: Illinois (IL), FIPS 17 Location: 39.853136 N, 88.953227 W Headwords: Macon Macon, IL Macon County Macon County, IL