- Laboratories Medical, Portsmouth
- Lakes & Ponds Construction Maintenance Restoration & Control, Portsmouth
- Land Surveyor, Portsmouth - Land Surveying Services
- Landscape Contractors & Designers, Portsmouth
- Landscaping, Portsmouth
- Laser Hair Removal, Portsmouth
- Lawn & Garden Equipment & Supplies, Portsmouth
- Lawn & Garden Services, Portsmouth
- Lawn Maintenance Services, Portsmouth
- Lawn Mowers & Power Equipment, Portsmouth
- Lawyers & Attorneys, Portsmouth
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- Legal Professionals, Portsmouth
- Libraries, Portsmouth
- Lighting Fixtures Repair, Maintenance & Installation, Portsmouth
- Limousine Service, Portsmouth
- Lingerie & Underwear for Women, Portsmouth - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, Portsmouth
- Livestock, Portsmouth
- Local & Short Haul Trucking Companies, Portsmouth
- Lodging, Portsmouth
- Long Haul Trucking Companies, Portsmouth
- Lumber & Wood Products Manufacturers, Portsmouth
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