- Laboratories Dental, Belmont
- Laboratories Medical, Belmont
- Landscape Contractors & Designers, Belmont
- Landscaping, Belmont
- Laser Hair Removal, Belmont
- Late Night Restaurants, Belmont
- Lawn & Garden Equipment & Supplies, Belmont
- Lawn & Garden Sprinkler Systems, Belmont
- Lawn Mowers & Power Equipment, Belmont
- Lawyers & Attorneys, Belmont
- Legal & Tax Services, Belmont
- Legal Professionals, Belmont
- Libraries, Belmont
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- Licensed Counselors, Belmont
- Lighting Consultants & Designers, Belmont
- Limousine Service, Belmont
- Linen Supply Services, Belmont
- Lions Clubs, Belmont
- Liquor Stores, Belmont
- Loans Personal, Belmont
- Locks, Belmont
- Locksmiths, Belmont - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Belmont
- Lodging, Belmont
- Lutheran Church, Belmont
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