Cranbury School District is a public school district located in and serving students in pre-kindergarten through eighth grade from Cranbury, in Middlesex County, New Jersey, United States. As of the 2020–21 school year, the district, comprised of one school, had an enrollment of 463 students and 55.9 classroom teachers (on an FTE basis), for a student–teacher ratio of 8.3:1. The district is classified by the New Jersey Department of Education as being in District Factor Group "J", the highest of eight groupings. District Factor Groups organize districts statewide to allow comparison by common socioeconomic characteristics of the local districts. From lowest socioeconomic status to highest, the categories are A, B, CD, DE, FG, GH, I and J. For ninth through twelfth grades, public school students move on to Princeton High School, located in Princeton, as part of a sending/receiving relationship with the Princeton Public Schools. Cranbury Township is granted a seat on the Princeton Regional Schools board of education, with the designated representative restricted to voting on issues pertaining to Princeton High School and district-wide issues. As of the 2020–21 school year, the high school had an enrollment of 1,555 students and 125.8 classroom teachers (on an FTE basis), for a student–teacher ratio of 12.4:1. History Originally two public schools, the Bunker Hill School and the South Cranbury School, were established in 1850. On May 25, 1896, voters approved the construction of a consolidated grade school that would replace the Bunker Hill School and the South Cranbury School. Construction on the school began in August 1896 and ended in January 1897. The school opened on January 25, 1897, with a population of 159 students. The school was dedicated on February 22, 1897. The Cranbury School had three departments: primary, grammar, and high school. Cranbury Neck School closed in 1903, and the students who attended Cranbury Neck attended Cranbury School after their school closed. In 1906, a south wing with two classrooms was added to the Cranbury School building. Wyckoff Mills School closed in 1910, and the students also attended Cranbury School after their school closed. In 1922, a North wing was added to the Cranbury School building, bringing enrollment to 200 students. In 1924, the Cranbury Library moved into the Cranbury School building The Cranbury Public Library moved into a temporary building outside of the school in 2020. The school building received additions in 1949, 1957, and 1967. The Old