- Labor Organizations, Wallaceburg
- Laboratories Medical, Wallaceburg
- Lawn & Garden Equipment & Supplies, Wallaceburg
- Lawn & Garden Services, Wallaceburg
- Lawn Maintenance Services, Wallaceburg
- Lawn Mowers & Power Equipment, Wallaceburg
- Lawyers & Attorneys, Wallaceburg
- Legal & Tax Services, Wallaceburg
- Legal Professionals, Wallaceburg
- Libraries, Wallaceburg
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- Life Insurance, Wallaceburg
- Lift Trucks, Wallaceburg
- Liquor Stores, Wallaceburg
- Livestock, Wallaceburg
- Loans Personal, Wallaceburg
- Locks, Wallaceburg
- Locksmiths, Wallaceburg - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Wallaceburg
- Lodging, Wallaceburg
- Long Haul Trucking Companies, Wallaceburg
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