The Commonwealth School, often referred to simply as Commonwealth, is a private, co-educational high school of about 150 students and 35 faculty members located in the downtown Back Bay neighborhood of Boston, Massachusetts, United States. It is accredited by the New England Association of Schools and Colleges.As of 2024, Niche ranked Commonwealth #2 of all private high schools in Massachusetts and #8 of all private high schools in the United States. Source: Wikipedia (en)