Wisconsin Elementary School is the secondary setting of Sibling Rivalries. It is the school most of the kids in Green Bay attend.
The school is similar to an average school, with a playground, gym, classrooms, and others. The principal is a strict teacher named Albert Green. However, in Season 4, he was replaced by his step-son, the much nicer Mark Leone.
In the Season 1 comic "Locker 239", the 2nd Grade student Mark Sanders accidentally drove right into the side of the school with his mother's car. Two years later, in the Season 4 comic "The Amnesia Act of 2015", the area that was destroyed is covered with caution tape.
- Albert Green - Principal (? - 2013)
- Mark Leone Jr. - Principal (2014 - present)
- Michael Jacob - 5th/6th Grade Math Teacher (? - present)
- Charlie Richards - 5th/6th Grade Science Teacher (? - present)
- Amanda Pratt - 5th/6th Grade Language Arts Teacher (? - present)
- Leslie Stevens - 5th/6th Grade Social Studies Teacher (? - present)
- Scott Hill - Gym Teacher (some time after 2012 - present)
- "Locker 239" is the first comic to take place entirely at the school (during three days).
- Sibling Rivalries Pre-Series
- Sibling Rivalries Main Series
- The McRearys Get Schooled! (first appearence; exterior and Mr. Jacob's classroom seen)
- Frightful Football Reunions (playground seen)
- Diamonds in the Rough (exterior and Mr. Jacob's classroom seen)
- Locker 239 (hallway, school auditorium, Mr. Jacob's classroom, and playground seen)
- San Salvador's Story (hallway seen)
- The Football Faker (cafeteria seen)
- Love is What Makes the World Go 'Round (exterior and cafeteria seen)
- Dodgeball Mishap (gym seen)
- Field Trip Gone Wrong! (exterior, Mr. Jacob's classroom and playground seen)
- Patrick McReary: School President (exterior, hallway, Mr. Jacob's classroom, and Mr. Leone's office seen)
- Wouldn't It Be Nice? (updated exterior, Mr. Jacob's classroom, Mr. Richards' classroom, and hallway seen)
- The Amnesia Act of 2015 (exterior, hallway and boys' restroom seen)
- One Tough Break-Up (exterior and cafeteria seen)
- Feeling Peachy (hallway seen)