With 3,705 students in the 2006–2007 school year, William Allen High School was the largest high school in the city of Allentown, the largest high school in the Lehigh Valley region of Pennsylvania, and the third largest high school in the state of Pennsylvania. In 2011, enrollment was reported as 3,115 pupils, with 220 teachers. By the fall of 2013, enrollment had declined significantly to 2,595 pupils. In 2013, 84% of pupils were eligible for a federal free or reduced price lunch due to the family meeting the federal poverty level. Additionally, 19% of pupils received special education services, while 5.7% of pupils were identified as being gifted.