The school is the oldest operating high school in Loudoun County which opened in 1954. County has served a mostly rural population, and remained this way especially after Broad Run High School's opening in 1969 took sections in the more suburban eastern half of the county. However, as the growth of Loudoun County hit further west beginning in the 1980s, and because of rapid growth from that time on, most of County's population has become suburban.After over 45 years of being the sole high school for the central part of the county, in 2000, County sent most of its eastern Leesburg student base to Stone Bridge High School after its student body ballooned to 1,600 students from about 1,200 for most of the 1990s. Two years later, County fed the remainder of its eastern Leesburg student base into Heritage High School. In 2005, a small number of County students were relocated to Freedom High School and Briar Woods High School.In 2010, Tuscarora High School opened up and took County's Lucketts area students.The mascot for the school, the Raider, was named in honor of Mosby's Raiders. The original school seal depicted the Raider on horseback with a Confederate Battleflag in his hands. This logo was changed in 1980 to the current design in the face of racial criticism over the emblem. However, when the first new gym was built and the logos were painted on the floor, the original design was accidentally used and had to be removed and repainted.In 1975 murals that illustrate important events and times in Loudoun County's history were painted in the Auditorium by the Loudoun Sketch Club. Two subsequent murals were created, one in the 1970s, the other in 2004 (commemorating the school's fiftieth year in operation).