Centralia, IL -- U.S. city in Illinois Population (2000): 14136 Housing Units (2000): 6276 Land area (2000): 7.501598 sq. miles (19.429050 sq. km) Water area (2000): 0.136615 sq. miles (0.353831 sq. km) Total area (2000): 7.638213 sq. miles (19.782881 sq. km) FIPS code: 12164 Located within: Illinois (IL), FIPS 17 Location: 38.525257 N, 89.132548 W ZIP Codes (1990): 62801 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Centralia, IL Centralia