- Sabotage Prevention Services, Portsmouth
- Safe & Vault, Portsmouth
- Safe, Lock & Key Repair Services, Portsmouth - Safes & Vaults Opening & Repair
- Safety & Security Systems & Consultants, Portsmouth
- Sales & Marketing Consultant, Portsmouth
- Salvation Army, Portsmouth
- Sand Gravel & Aggregate, Portsmouth
- Sandwich Shop Restaurants, Portsmouth
- Satellite Dish Antennas & Equipment Dealers, Portsmouth
- Savings & Loan Associations, Portsmouth
- Savings Banks, Portsmouth
- Scientific & Laboratory Equipment & Instruments, Portsmouth
- Scientific & Research Professionals, Portsmouth
- Scientific Services, Portsmouth
- Scrap & Waste Materials, Portsmouth
- Screen Houses, Portsmouth
- Screen Printing, Portsmouth
- Screens Doors & Windows, Portsmouth
- Seafood Restaurants, Portsmouth
- Sealcoating, Portsmouth - Asphalt Sealcoating & Paving
- Security & Surveillance System & Equipment, Portsmouth
- Security Alarm Systems - Home & Business, Portsmouth
- Security Brokers & Dealers, Portsmouth
- Security Control Systems & Monitoring, Portsmouth - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Investigative Services, Portsmouth
- Security Services, Portsmouth
- Self Defense Programs, Portsmouth
- Semiconductors & Equipment, Portsmouth
- Senior Citizens Service & Health Organizations, Portsmouth
- Septic Tank Pumping & Cleaning, Portsmouth - Septic Systems
- Septic Tanks & Systems, Portsmouth - Wholesale, Dealers & Suppliers
- Service Establishment Supplies & Equipment, Portsmouth
- Sewer & Drain Cleaning & Repair, Portsmouth - Drain Cleaner & Installation Services
- Sewing & Yarn Stores & Supplies, Portsmouth
- Sewing Machines, Equipment & Supplies, Portsmouth
- Sheet Metal Contractors, Portsmouth - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Portsmouth
- Shells Marine, Portsmouth
- Shoe Repair Shops, Portsmouth
- Shoe Store - More, Portsmouth
- Shoe Stores, Portsmouth - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Portsmouth
- Shutters - Interior & Exterior, Portsmouth - Wood, Vinyl, Window, Plantation Shutters, etc
- Siding Contractors, Portsmouth - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Sightseeing Tours, Portsmouth
- Sign Supplies & Sign Making Equipment, Portsmouth
- Signs, Portsmouth
- Skateboards & Equipment Shops, Portsmouth - Skateboarding Supplies
- Ski Equipment, Portsmouth
- Ski Equipment Water & Snow Manufacturers, Portsmouth
- Skin Care & Cosmetology Salons, Portsmouth
- Skin Care Products & Treatments, Portsmouth
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- Sleds, Snowboards & Snowshoes Shops, Portsmouth - Snow Sleds, Toboggans, Helmets, Boots, Goggles, Clothing, Gear & More
- Small Appliances, Portsmouth
- Smoke Stacks Manufacturers, Portsmouth
- Snacks & Desserts, Portsmouth
- Snow Removal Services, Portsmouth - Snow Plow Service
- Social Clubs & Organizations, Portsmouth
- Social Service Organizations Self Help Information, Portsmouth
- Social Services & Welfare, Portsmouth
- Social Workers & Services, Portsmouth
- Societies & Foundation Associations, Portsmouth
- Sound Systems Equipment Manufacturers, Portsmouth
- Special Education & Care, Portsmouth
- Special Interest Schools Or Instruction, Portsmouth
- Speciality Food Stores, Portsmouth
- Specialty Animal Services, Portsmouth
- Specialty Communication Companies & Services, Portsmouth
- Specialty Goods Storage, Portsmouth
- Specialty Rental Services, Portsmouth
- Specialty Stores, Portsmouth
- Speech & Hearing Specialists, Portsmouth
- Speech Pathologists, Portsmouth - Speech & Language Therapy
- Sporting & Recreational Camps, Portsmouth
- Sporting Goods Equipment Rental, Portsmouth
- Sporting Goods Manufacturers, Portsmouth
- Sporting Goods Stores, Portsmouth
- Sports & Recreational Services, Portsmouth
- Sports Clubs, Portsmouth
- Sportswear Clothing Stores, Portsmouth - Sports Clothes
- Sportswear Manufacturers, Portsmouth
- Sprinkler Alarm Systems, Portsmouth - Fire Sprinkler Systems
- Staffing & Support Services, Portsmouth
- Stamp Collecting & Coin Dealers , Portsmouth
- State Government, Portsmouth
- State Parks, Portsmouth
- Stationery & Office Supplies, Portsmouth
- Steak House Restaurants, Portsmouth
- Steamship Companies & Agencies, Portsmouth
- Steel & Metal Goods, Portsmouth - Steel Distributors
- Stock & Bond Brokers & Dealers, Portsmouth
- Stocks & Bond Brokers, Portsmouth
- Stone And Glass Products, Portsmouth
- Store Fixtures, Portsmouth
- Storm Doors & Windows, Portsmouth
- Structural Steel Erection, Portsmouth
- Submarine Sandwich Restaurants, Portsmouth
- Substance Abuse Services, Portsmouth
- Support Services, Portsmouth
- Surfboard & Windsurfing Equipment Shops, Portsmouth
- Surveyor Services, Portsmouth - Surveying Service
- Sweepers & Scrubbers Industrial, Portsmouth - Sweeping Service
- Swimming Pools, Hot Tubs & Spas Rental & Leasing, Portsmouth
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