4 Balsam Road as Cady's House (exterior)
Cady's parents get her ready for her first day at school and later she gets into a fight with Janis Ian out front during her party.
Source: Torontoist
Mean Girls Filming Locations
A homeschooled teenager attends public school for the first time and finds herself embedded with a group of popular girls in an attempt to bring down the hateful clique as planned by two of her new outcast friends.
Mean Girls was filmed in Toronto in Canada.
Etobicoke Collegiate Institute as North Shore High School (exterior)
Cady arrives for her first day of school and soon ends up hanging out with two outcasts, Janis Ian & Damian, in the field behind the school.
Artscape Youngplace as North Shore High School (hallway/bathroom)
Cady hides out in the bathroom to eat her lunch on her first day, and later she walks down the hallway with Janis Ian and Damian while learning about the school.
Source: Torontoist
Malvern Collegiate Institute as North Shore High School (gym)
Cady is pulled out of health class to talk to the principal and then all of the female students are brought in by the principal. Later, the students attend the Spring Fling set up in the gym.
Source: Torontoist
Sherway Gardens Mall as Old Orchard Mall
Cady goes with the Plastics to the mall and sees Janis Ian working there.
11 High Point Road as Regina's House (exterior)
The Plastics head to Regina's house to hang out.
Source: Filmap
Beech Avenue (between Kingston & Balsam) as Street near Cady's House
Regina complains to her boyfriend about Cady while driving to her party. She learns the depth of Cady's deception when she gets back to her parked car.
Former Laughlen Centre as North Shore High School (principal's office)
Regina tells Principal Duvall about the Burn Book and he interrogates Cady and the other two about it.
Source: Torontoist
Convocation Hall (U of T) as Mathletes Competition
Cady attends the Mathletes State Championship that she wins in the sudden death round.