At , Northwestern High School has a capacity of 2,700 students, with a Fall 2013 enrollment of approximately 2,217. Northwestern's largest enrollment was reached during the 2006–2007 school year, with over 3,000 students. Northwestern had over twenty portable classrooms to accommodate the over-enrollment. Ironically, the school had never had portable trailers until after the new facility was built. Even though Northwestern's 2013-14 enrollment was under capacity, the school then housed twenty portable classrooms. The additional space was primarily needed to accommodate the expansive course offerings and programs available at the school.