- Labor Organizations, Brockville
- Laboratories Medical, Brockville
- Land Surveyor, Brockville - Land Surveying Services
- Landscape Contractors & Designers, Brockville
- Landscaping, Brockville
- Landscaping Materials & Supplies, Brockville
- Language Schools, Brockville
- Laundromats & Dry-Cleaning, Coin-Operated, Brockville
- Law Libraries, Brockville
- Lawn & Garden Equipment & Supplies, Brockville
- Lawn & Garden Services, Brockville
- Lawn & Garden Sprinkler Systems, Brockville
- Lawn Maintenance Services, Brockville
- Lawn Mowers & Power Equipment, Brockville
- Lawyers & Attorneys, Brockville
- Legal & Tax Services, Brockville
- Legal Information & Referral Services, Brockville
- Legal Professionals, Brockville
- Libraries, Brockville
- Life Insurance, Brockville
- Lift Trucks, Brockville
- Lighting Consultants, Brockville
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- Lighting Contractors, Brockville
- Limousine Service, Brockville
- Linen Supply Services, Brockville
- Lingerie & Underwear for Women, Brockville - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, Brockville
- Live Theaters, Brockville
- Livestock, Brockville
- Livestock Dealers, Brockville
- Loans Personal, Brockville
- Local & Short Haul Trucking Companies, Brockville
- Locks, Brockville
- Locksmiths, Brockville - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Brockville
- Lodging, Brockville
- Logistics Freight, Brockville
- Long Haul Trucking Companies, Brockville
- Luggage & Accessories , Brockville
- Lumber & Lumber Products, Brockville
- Lumber & Lumber Products, Brockville
- Lumber Companies, Brockville - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Brockville
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