The school also serves the neighbourhoods of Kanata Lakes, Beaverbrook, Katimavik-Hazeldean, Richardson Ridge, and Morgan's Grant.

As such, Earl of March served for many years as the sole high school for Ottawa's then-nascent northwestern suburbs outside the Greenbelt.

As Kanata started to rapidly expand in the late 1970s to the 1990s, other high schools were built and the catchment area was made smaller to prevent excessive over-crowding.

The second floor of the school also received renovations, adding five new computer labs to the building and adjusting the layout of some of the internal classrooms to accommodate.

In 2009, the science classrooms were renovated to fix possible gas and water leaks in the old wooden benches and desks, as well as to remove safety issues regarding climbing stairs with chemicals.

The old science rooms were similar to the lecture theatres, with rows, each on a step higher than the last, of wooden benches and desks.

The new science rooms also feature proper fume-hoods for handling chemicals, which are sometimes used by the computer technology department for soldering.

The new wing has already elected its own student council, put on its own musical, created its own band and arts programs, and has started several other traditions.

The pipes froze & burst during the winter break as the heating was turned off while students were not attending school.