Home › Top 4 Car Rental in O'Fallon, Missouri Find best Car Rental in O'Fallon, Missouri, with all necessary contact information, including addresses, phone numbers, working hours, map locations, and website links. Enterprise Rent-A-Car - O'Fallon US, O'Fallon, MO 633661491 Mexico Loop Rd E Budget Car Rental - O'Fallon US, O'Fallon, MO 633682721 State Hwy K Avis Car Rental - O'Fallon US, O'Fallon, MO 633682721 State Hwy K Hertz - O'Fallon US, O'Fallon, MO 633041120 Technology Dr