| La Clé, Baby Needs Depot, 63 Main St - Penetanguishene | Penetanguishene |
| La Clé, Centre pour l'enfant et la famille ON y va - Penetanguishene, 63 Main St - Penetanguishene | Penetanguishene |
| La Clé, Penetanguishene - Main St, CFRH 88.1 * 106.7 | Penetanguishene |
| Lake Simcoe Region Conservation Authority [Central East], Bradford West Gwillimbury, Scanlon Creek Conservation Area | Bradford West Gwillimbury |
| Lake Simcoe Region Conservation Authority [Central East], Bradford West Gwillimbury, Scanlon Creek Nature Centre - Outdoor Environmental Education Program | Bradford West Gwillimbury |
| Lakeside Retirement at Innisfil | Innisfil |
| Lakeside Women's Clinic, Barrie | Barrie |
| LAMP - ASK! Community Information Centre | Etobicoke South |
| Landlord and Tenant Board, Toronto North District Office | Toronto Downtown |
| Landlord's Self Help Centre | Toronto |
| Law Society of Ontario, Law Society Referral Service | Toronto |
| Learning Disabilities Association of York-Simcoe | Richmond Hill |
| Lefroy Skating Club | Innisfil |
| Legal Aid Ontario, Barrie - 75 Mulcaster St, Advice Lawyer for Family Law | Barrie |
| Legal Aid Ontario, Barrie - 85 Bayfield St, Central District Office | Barrie |
| Legal Line, Online Services | Toronto |
| Lesbian Gay Bi Trans YouthLine, Text and Chat YouthLine | Toronto |
| Liberal Party of Canada, Barrie-Innisfil Federal Electoral District Association | Barrie |
| Lice Squad.com | Barrie |
| LifeLabs, Borden | Adjala-Tosorontio |
| LifeLabs, Innisfil, Medical Laboratory Services | Innisfil |
| Linda's Nursing Foot Care, Mobile Service | Bradford West Gwillimbury |
| Living Faith Community Presbyterian Church | Essa |
| Living Green Barrie | Barrie |
| Locomotion Day Care Centre, Main Station, Locomotion Day Care Centre, Main Station | New Tecumseth |
| Locomotion Day Care Centre, South Station, Locomotion Day Care Centre, South Station | New Tecumseth |
| LOFT Community Services, Bradford House, Assisted Living for Seniors | Bradford West Gwillimbury |
| LOFT Community Services, Supported House Services - South Simcoe Hub, Bradford House | Bradford West Gwillimbury |
| Look Good Feel Better, Barrie | Barrie |
| Love From The Heart Homecare | Barrie |
| LUDUH, Designated Drivers, Barrie | Barrie |
| Lullaboo Nursery and Childcare Center, Bradford Campus | Bradford West Gwillimbury |
| Lupus Ontario | |
| Lupus Ontario, Online/Web Service, Online Support Group | |
| Lutheran Church of the Good Shepherd, Barrie - 222 Steel St, Martin Luther Court | Barrie |
| Lutheran Church of the Good Shepherd, Barrie - Mapleview Dr W | Barrie |