The school consists of four divisions: Ethical Culture, Fieldston Lower, Fieldston Middle, and Fieldston Upper. Ethical Culture, located on the Upper West Side of Manhattan, and Fieldston Lower, located on the Fieldston campus in the Riverdale section of the Bronx, serve Pre-K through 5th grade. The two lower schools feed into Fieldston Middle (6th–8th grades) and Fieldston Upper (9th–12th grades)—also located on the Fieldston campus in Riverdale. Ethical Culture is headed by Principal Rob Cousins, Fieldston Lower is headed by Principal Joe McCauley, Fieldston Middle is headed by Principal Chia-Chee Chiu, and Fieldston Upper is headed by Principal Nigel Furlonge. Tuition and fees for ECFS were $55,510 for the 2020–2021 school year.