- Sandwich Shop Restaurants, Portsmouth
- Satellite Dish Antennas & Equipment Dealers, Portsmouth
- Satellite TV Service, Portsmouth
- Savings & Loan Associations, Portsmouth
- Savings Banks, Portsmouth
- Scrap & Waste Materials, Portsmouth
- Scrapbooks & Scrapbook Supplies, Portsmouth
- Screen Printing, Portsmouth
- Seafood Restaurants, Portsmouth
- Secondary Schools, Portsmouth
- 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 Services, Portsmouth
- Senior Citizens Information & Services, Portsmouth
- Senior Citizens Service & Health Organizations, Portsmouth
- Septic Tank Installation & Repair, Portsmouth - Septic Systems
- Septic Tank Pumping & Cleaning, Portsmouth - Septic Systems
- Septic Tanks & Septic Systems Contractors, Portsmouth - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems, Portsmouth - Wholesale, Dealers & Suppliers
- Sewer & Drain Cleaning & Repair, Portsmouth - Drain Cleaner & Installation Services
- Sewing Contractors, Portsmouth
- Shoe Accessories, Portsmouth
- Shoe Store - More, Portsmouth
- Shoe Stores, Portsmouth - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Portsmouth
- Siding Contractors, Portsmouth - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Portsmouth
- Sleep Disorders Treatment & Information Centers, Portsmouth
- Snack Foods, Portsmouth
- Snacks & Desserts, Portsmouth
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- Snow Removal Services, Portsmouth - Snow Plow Service
- Social Security And Disability Attorneys & Lawyers, Portsmouth
- Social Security And Disability Lawyers & Attorneys, Portsmouth
- Social Security Counselors & Representatives, Portsmouth
- Social Services & Welfare, Portsmouth
- Social Workers & Services, Portsmouth
- Societies & Foundation Associations, Portsmouth
- Special Interest Schools Or Instruction, Portsmouth
- Specialty Animal Services, Portsmouth
- Specialty Stores, Portsmouth
- Sporting Goods Stores, Portsmouth
- Sports Medicine, Portsmouth - Doctors, Physicians & Surgeons
- Staffing & Support Services, Portsmouth
- State Government, Portsmouth
- Stationery & Office Supplies, Portsmouth
- Steel & Metal Goods, Portsmouth - Steel Distributors
- Steel Erection Contractors, Portsmouth - Steel Erectors
- Stereo, Audio & Video Equipment Dealers & Stores, Portsmouth
- Stocks & Bond Brokers, Portsmouth
- Stone, Portsmouth
- Stoves & Furnace Equipment, Portsmouth - Fittings & Repair Parts
- Submarine Sandwich Restaurants, Portsmouth
- Substance Abuse Clinics, Portsmouth - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Substance Abuse Outpatient Clinics, Portsmouth
- Surveyor Services, Portsmouth - Surveying Service
- Surveyors, Portsmouth
- Swimming Pool, Sauna & Spa Contractors, Portsmouth
- Swimming Pools, Portsmouth
- Swimming Pools Contractors, Portsmouth - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Portsmouth
- Swimming Pools Supplies, Equipment & Accessories, Portsmouth
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