Denny's 959 Illinois Rt 3 6:00 AM - 12:00 AM 6:00 AM - 12:00 AM 6:00 AM - 12:00 AM 6:00 AM - 12:00 AM Open 24 Hours Open 24 Hours 6:00 AM - 12:00 AM959 Illinois Rt 3 Waterloo, IL 62298 US