Mascoutah, IL -- U.S. city in Illinois Population (2000): 5659 Housing Units (2000): 2309 Land area (2000): 8.637893 sq. miles (22.372039 sq. km) Water area (2000): 0.060983 sq. miles (0.157946 sq. km) Total area (2000): 8.698876 sq. miles (22.529985 sq. km) FIPS code: 47423 Located within: Illinois (IL), FIPS 17 Location: 38.497312 N, 89.801248 W ZIP Codes (1990): 62258 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Mascoutah, IL Mascoutah