Chambersburg Area Senior High School (CASHS) is a public high school located in Franklin County, Pennsylvania. The school serves grades 9, 10, 11, and 12. Students come from Chambersburg and surrounding townships of Hamilton, Greene, Lurgan, Letterkenny and Guilford. As of the 2020–2021 school year, the school had an enrollment of 2,182 students and 118.06 classroom teachers on a FTE basis, for a student-teacher ratio of 18.48. CASHS has occupied its current facilities since 1955.