O Fallon, Illinois — O'Fallon is a home rule city in St. Clair County, Illinois, established in 1854 after German settlers were drawn to the area by fertile farmland and a new railroad depot. Located roughly five miles from Scott Air Force Base, the city sits on the Illinois side of the St.This page organizes FFL dealer listings associated with O Fallon, Illinois within the directory’s location hierarchy. Visitors can keep browsing focused on the named place, move through its surrounding geography, and open individual listings for record-specific information. The page remains centered on the location itself while the catalogue can change independently. Use the hierarchy to return to broader place pages or continue toward a more specific community. Each step keeps the browsing path anchored to a named place and its surrounding geographic context.