- Laboratories Dental, Belmont
- Laboratories Medical, Belmont
- Lacrosse Equipment & Supplies, Belmont
- Land Surveyor, Belmont - Land Surveying Services
- Landscape Contractors & Designers, Belmont
- Landscape Garden Services, Belmont
- Landscaping, Belmont
- Language Schools, Belmont
- Late Night Restaurants, Belmont
- Lawn & Garden Equipment & Supplies, Belmont
- Lawn & Garden Services, Belmont
- Lawn Maintenance Services, Belmont
- Lawyers & Attorneys, Belmont
- Leather Goods Cleaners & Dyers, Belmont
- Legal & Tax Services, Belmont
- Legal Documents Preparation Services, Belmont - Legal Forms
- Legal Professionals, Belmont
- Libraries, Belmont
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- Life Insurance, Belmont
- Lighting Fixtures & Equipment, Belmont
- Limousine Service, Belmont
- Liquid & Bulk Storage, Belmont
- Liquid Transportation - Non Hazardous, Belmont
- Liquor Stores, Belmont
- Lithograph Inks Manufacturers, Belmont
- Lithographic Printing, Belmont
- Locks, Belmont
- Locksmiths, Belmont - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Belmont
- Lodging, Belmont
- Lodging Services, Belmont
- Long Haul Trucking Companies, Belmont
- Lubricating Oils , Belmont - Motor Oil
- Lumber & Lumber Products, Belmont
- Lumber & Lumber Products, Belmont
- Lutheran Church, Belmont
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