| Kempenfelt Bay School | Innisfil |
| Kempenfelt Bay Yacht Club | Barrie |
| Kevin Roderick Music, Music For Seniors | Barrie |
| Kidney Foundation of Canada, Barrie, Kidney Clothes Program | Barrie |
| Kidney Patients Association Barrie & South Simcoe, No physical location | Barrie |
| Kids Help Phone | Toronto |
| Kids Help Phone, Crisis Text Line | Toronto |
| Kinark Child and Family Services, Barrie - Simcoe St, Family, Individual, and Group Counselling | Barrie |
| Kinark Child and Family Services, Barrie - Simcoe St, Live-In Treatment | Barrie |
| Kinark Child and Family Services, Barrie - Simcoe St, Simcoe County Child and Youth Crisis Services | Barrie |
| Kinark Child and Family Services, Barrie - Simcoe St, SNAP - Stop Now And Plan program | Barrie |
| Kinark Child and Family Services, Barrie ABA Centre, Autism Services - Centre-based Applied Behavioural Analysis (ABA) | Barrie |
| KnowledgeSurge Institute | Barrie |
| Knox Presbyterian Church, Gift of Grace Soup Kitchen, St Paul's United Church | Midland |
| KOOL 107.5 FM, Barrie | Barrie |
| Krasman Centre | Richmond Hill |