St John's College is nestled beside Darwin Botanical Gardens and is a five minute drive from Darwin City. Public transport is available directly outside the front of the College. The physical setting of the College is very aesthetically pleasing and there are a number of sport fields at the school.
The College has a Middle School Campus (Chevalier Campus) for students in Years 7-9 and a Senior School Campus (Hartzer Campus) for students in Years 10-12. The two campuses are connected by a walk way over the Botanical Gardens.
The Boys Boarding facilities are situated on the Middle School Campus while the Girls Boarding facilities are situated on the Senior School Campus.
The school has ample shade and covered walk ways to cater for the Darwin climate. All classrooms are air-conditioned