- Labor Organizations, North Smithfield
- Laboratories Medical, North Smithfield
- Laboratory Equipment Repair & Service, North Smithfield
- Land Surveyor, North Smithfield - Land Surveying Services
- Landscape Contractors & Designers, North Smithfield
- Landscaping, North Smithfield
- Laser Equipment Repair & Service, North Smithfield
- Lawn & Garden Equipment & Supplies, North Smithfield
- Lawn Mower Repair & Blade Sharpening Service, North Smithfield
- Lawyers & Attorneys, North Smithfield
- Leather Goods, North Smithfield
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- Leather Tanning & Finishing Manufacturers, North Smithfield
- Legal & Tax Services, North Smithfield
- Legal Information & Referral Services, North Smithfield
- Legal Professionals, North Smithfield
- Liquor Stores, North Smithfield
- Locks, North Smithfield
- Locksmiths, North Smithfield - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, North Smithfield
- Lodging, North Smithfield
- Lodging Services, North Smithfield
- Long Haul Trucking Companies, North Smithfield
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