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Purchase O'Fallon, MO 636 area code phone numbers for your business

Spanning 29.19 square miles, O'Fallon, Missouri, is located in the St. Louis metropolitan area. Containing a total population of 79,329 people, the population density is 2,717.7 people per square mile. O'Fallon is the largest city in St. Charles County and the seventh largest city in the state of Missouri. O'Fallon's population includes 28,234 households, 44.7% of which have children under the age of 18 years old, and 6.2% of which have a person 65 years of age or older. O'Fallon has an average household income of $76,839 and an average household size of 2.80 persons. In terms of business, O'Fallon contains 5,893 companies with industries in construction, professional and business services, transportation equipment, finance, insurance, and accommodation and food services.


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Cities sharing the same area code are Saint Charles and Chesterfield.


Nearby area codes include 314, 417, 573, and 816.