The St. Peter School community reflects the rich ethnic, racial, religious and socioeconomic diversity of the greater Cambridge area.

Nationalities represented at St. Peter School include: Australia, Austria, Argentina, Brazil, Bolivia, Canada, China, Chile, Colombia, Dominican Republic, Ethiopia, France, Germany, Ghana, Guatemala, Haiti, Ireland, India, Iraq, Japan, Jordan, Korea, Lebanon, Mexico, Moldova, Nepal, Nigeria, Philippines, Poland, Portugal, Russia, Spain, United Kingdom and Venezuela.