Charlestown High School is divided into four independent learning communities that offer students the chance to study in a more intimate setting, while still having the benefit of attending a large school. The high school maintains strong partnerships with colleges, including Boston University's COACH program, to prepare students, starting from the 9th grade, to pursue a higher education. It offers unique courses in Arabic, entrepreneurship and forensic science, as well as a variety of athletic and extra-curricular activities. Its boy's basketball team has been top-ranked both state-wide and nationally.