| Employee group | Approximate number of employees | Collective agreement |
|---|---|---|
| Amalgamated Transit Union Local 1189 -full-time and part-time transit employees ATU Canada website | 193 | ATU 1189: 2017 to 2021 |
| Canadian Union of Public Employees Local 241 -full-time and part-time outside employees CUPE 241 website | 345 | CUPE 241: February 1, 2022 to January 31, 2025 |
| Canadian Union of Public Employees Local 973 -full-time and part-time office employees CUPE 973 website | 234 | CUPE 973: February 1, 2022 to January 31, 2025 |
| Canadian Union of Public Employees Local 1946 -full-time and part-time library employees CUPE Ontario website | 75 | CUPE 1946: 2012 to 2016 |
| Guelph Professional Firefighters’ Association -Full-time firefighters GPFFA website Ontario Professional Firefighters website | 165 | GPFFA: 2018 to 2022 |
| International Association of Theatre Stage Employees (IATSE) Local 357 -Part-time theatre employees IATSE website | 36 | IATSE 357: 2018 to 2020 |
| Ontario Public Service Employee Union (OPSEU) local 231 paramedics OPSEU website | 157 | Not available |
| Non-Union Municipal Employees -Full and part-time management and non-management employees | 337 | Not applicable |
