O'Fallon is a city along Interstate 70 and Interstate 64 between Lake St. Louis and St. Peters in St. Charles County, Missouri. It is part of the St. Louis Metropolitan Statistical Area. As of the 2010 census O'Fallon had a population of 79,329, making it the largest municipality in St. Charles County and seventh largest in the state of Missouri. In 2006 Money Magazine named O'Fallon 39th in its "Best 100 Places to Live." Money Magazine also ranked O'Fallon 68th out of 100 in 2008, 26th out of 100 in 2010, and 42nd out of 100 in 2017. O'Fallon's namesake in St. Clair County, Illinois is also part of the St. Louis Metropolitan Statistical Area. The two O'Fallons are one of the few pairs of same-named municipalities to be part of the same MSA.
O'Fallon was founded in 1856 by Nicholas Krekel. The community was named after John O'Fallon the President of the North Missouri Railroad. A post office called O'Fallon has been in operation since 1859. The St. Mary's Institute of O'Fallon was listed on the National Register of Historic Places in 2007.
According to the United States Census Bureau, the city has a total area of 29.20 square miles (75.63 km²), of which, 29.19 square miles (75.60 km²) is land and 0.01 square miles (0.03 km²) is water.
As of the census of 2010, there were 79,329 people, 28,234 households, and 21,436 families residing in the city. The population density was 2,717.7 inhabitants per square mile (1,049.3/km²). There were 29,376 housing units at an average density of 1,006.4 per square mile (388.6/km²). The racial makeup of the city was 89.9% White, 4.0% African American, 0.2% Native American, 3.2% Asian, 0.1% Pacific Islander, 0.8% from other races, and 1.8% from two or more races. Hispanic or Latino of any race were 2.7% of the population.
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