Putnam -- U.S. County in Illinois Population (2000): 6086 Housing Units (2000): 2888 Land area (2000): 159.795597 sq. miles (413.868679 sq. km) Water area (2000): 12.446080 sq. miles (32.235199 sq. km) Total area (2000): 172.241677 sq. miles (446.103878 sq. km) Located within: Illinois (IL), FIPS 17 Location: 41.226096 N, 89.274381 W Headwords: Putnam Putnam, IL Putnam County Putnam County, IL