It filmed at Mount Mary Retreat Centre, Ancaster. The fictional Derry High School, where bullies and outcasts first clash, is staged at this retreat centre. On screen it's Derry High School.
Probable Named in published production coverage; the coordinate is the place itself, checked against a gazetteer. This is a street or a long feature — the coordinate is a representative point on it, not a single spot.
Planning the trip? The Canada travel atlas covers money, language and getting around
Venture keeps every scene location on one map, sorted by how far you'd have to walk. Open it in Ancaster and it tells you what was shot around you, how to get there, and whether you can actually go in.
Download Venture for iOS Android