Located in the Don Mills neighbourhood, it serves an ethnically diverse student population of approximately 1000.

Initially, the board planned to build two separate schools on the site with a shared heating plant, but in October 1957, trustee Dorothy Bishop prepared a report which raised the possibility of saving money by placing the two schools under one roof, as had previously been done in Vancouver and Calgary.

DMCI's Reach for the Top team placed seventh at the Ontario Provincials in the 2010–2011 season, their best achievement in the competition.

[citation needed] In 1998, DMCI was asked by the Toronto District School Board to represent Canada at the inaugural Young People's Summit (YPS), held in conjunction with the annual meeting of G8 countries in Birmingham, England.

[citation needed] Don Mills is also home of the award-winning Northern Lights Show Choir.