- Labor Organizations, Bowmanville
- Laboratories Medical, Bowmanville
- Land Surveyor, Bowmanville - Land Surveying Services
- Landscape Contractors & Designers, Bowmanville
- Landscape Lighting, Bowmanville
- Landscaping, Bowmanville
- Laser Therapy Clinics, Bowmanville
- Lawn & Garden Equipment & Supplies, Bowmanville
- Lawn & Garden Services, Bowmanville
- Lawn & Garden Sprinkler Systems, Bowmanville
- Lawn Maintenance Services, Bowmanville
- Lawyers & Attorneys, Bowmanville
- Legal & Tax Services, Bowmanville
- Legal Professionals, Bowmanville
- Libraries, Bowmanville
- License & Registry Services, Bowmanville
- Life Insurance, Bowmanville
- Lift Trucks, Bowmanville
- Lighting Consultants, Bowmanville
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- Lighting Consultants & Designers, Bowmanville
- Lighting Contractors, Bowmanville
- Limousine Service, Bowmanville
- Lingerie & Underwear for Women, Bowmanville - Bras, Panties, Bustiers, Corsets & More
- Liquid & Bulk Storage, Bowmanville
- Liquor Stores, Bowmanville
- Livestock, Bowmanville
- Loans Personal, Bowmanville
- Locks, Bowmanville
- Locksmiths, Bowmanville - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Bowmanville
- Lodging, Bowmanville
- Long Haul Trucking Companies, Bowmanville
- Lp Gas Equipment & Supplies, Bowmanville
- Lubricating Oils , Bowmanville - Motor Oil
- Lubricating Oils & Greases, Bowmanville
- Lumber Companies, Bowmanville - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Bowmanville
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