Green Mount Lakes Apartments for rent in O Fallon, IL on ForRent.com: (888) 211-5866 - Availability, pricing and special promotions subject to change daily. Green Mount Lakes Apartments for rent in O'Fallon, IL offering 1, 2 and 3 bedroom apartments that feature full size washer and dryers, or connections, garden tubs*, private patios and balconies, carports and garages, extra storage, cable ready with high speed internet access and so much more! Community amenities include a swimming pool, fitness center, theater room, business center with free Wi-Fi, 4 acre lake with scenic walking trail, picnic areas, car care center and this is only the beginning. We are close to Scott Air Force Base (SAFB), I-64, Metro Link and Downtown St. Louis, MO.