- Labeling Service, Portsmouth
- Labor Organizations, Portsmouth
- Labor Unions, Portsmouth
- Laboratories Dental, Portsmouth
- Laboratories Medical, Portsmouth
- Laboratory Equipment Repair & Service, Portsmouth
- Land Surveyor, Portsmouth - Land Surveying Services
- Landscape Contractors & Designers, Portsmouth
- Landscaping, Portsmouth
- Late Night Restaurants, Portsmouth
- Laundry & Dry Cleaning Equipment & Supplies, Portsmouth - Cleaners & Dryers Sales, Repair, Service & Leasing
- Laundry Equipment Rental & Leasing, Portsmouth
- Laundry Self Service, Portsmouth
- Lawn & Garden Equipment & Supplies, Portsmouth
- Lawn & Garden Services, Portsmouth
- Lawn Maintenance Services, Portsmouth
- Lawn Mower Repair & Blade Sharpening Service, Portsmouth
- Lawyers & Attorneys, Portsmouth
- Leather Goods & Luggage Repair, Portsmouth
- Legal & Tax Services, Portsmouth
- Legal Professionals, Portsmouth
- Libraries, Portsmouth
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- Life Insurance, Portsmouth
- Lighting Fixtures & Equipment, Portsmouth
- Limousine Service, Portsmouth
- Linen Supply Services, Portsmouth
- Lingerie & Underwear for Women, Portsmouth - Bras, Panties, Bustiers, Corsets & More
- Livestock, Portsmouth
- Living Room Furniture, Portsmouth
- Living Word Church, Portsmouth
- Loans Check Cashing, Portsmouth
- Loans Personal, Portsmouth
- Loans Title Services, Portsmouth
- Locks, Portsmouth
- Locksmiths, Portsmouth - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Portsmouth
- Lodging, Portsmouth
- Lodging Services, Portsmouth
- Long Haul Trucking Companies, Portsmouth
- Luggage & Accessories , Portsmouth
- Lumber & Lumber Products, Portsmouth
- Lumber & Lumber Products, Portsmouth
- Lumber Companies, Portsmouth - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Portsmouth
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