The International School of Aruba is a non-profit, co-educational, English language school owned and operated by ISS. It was founded in 1929 and was previously owned by Lago Oil and Transport Co. Ltd. From 1986 on, the school was governed by the ISA community and parent body. ISA was acquired by ISS in 2004. In 2005, a new campus was constructed, and ISA was relocated to the center of the island of Aruba.
The school is a U.S. State Department assisted school. ISA has approximately 200 students from Montessori (18 months old) through grade 12. The student body represents 22 countries. The average class size is 16. There are 30 faculty members of diverse nationalities. Seventy percent of the teaching staff has master's degrees. The Head of School is US trained and certified, with both U.S. and International experience. The school is growing in scope and is home to teachers and students inspired to be a part of a vibrant learning community.