Denny's 711 N Harlem Avenue 6:00 AM - 11:30 PM 6:00 AM - 11:30 PM 6:00 AM - 11:30 PM 6:00 AM - 11:30 PM 6:00 AM - 11:30 PM 6:00 AM - 11:30 PM 6:00 AM - 11:30 PM711 N Harlem Avenue Oak Park, IL 60302 US