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O'fallon

1. O'Fallon, Illinois, United States [City]; population was 16,073 in 1990; housing units was 6,326 in 1990; location is 38°36'N 89°55'W; land area is 6.13 square miles (3,926 acres); water area is 0.01 square miles (8 acres); FIPS code is 55249 [SourceCBP]
2. O'Fallon, Illinois, United States [Populated Place] is in St. Clair County; location is 38°35'32"N 89°54'40"W; elevation is 550 feet [SourceGSP]
3. O'Fallon, Missouri, United States [City]; population was 18,698 in 1990; housing units was 6,714 in 1990; location is 38°47'N 90°42'W; land area is 15.92 square miles (10,188 acres); water area is 0.01 square miles (4 acres); FIPS code is 54074 [SourceCBP]
4. O'Fallon, Missouri, United States [Populated Place] is in St. Charles County; location is 38°48'38"N 90°41'59"W; elevation is 543 feet [SourceGSP]