 Four of the district's middle schools feed into two high school feeder campuses; since the 2011–2012 school year, the Killough and Harmon campuses have served the city's ninth- and tenth-grade students, while the main campus at the intersection of FM 1171 (Main Street) and Valley Parkway is used primarily for eleventh- and twelfth-grade students.The district also operates the Dale Jackson Career Center and Career Center East, along with conducting a night high school in Lewisville.According to American Community Survey results from 2007 to 2011, 86.7% of the city's population aged 25 or older had graduated from high school, 29.7% held a bachelor's degree or higher, and 8.4% held a graduate or professional degree.