- Safe & Vault, Medford
- Sales & Marketing Consultant, Medford
- Sandwich Shop Restaurants, Medford
- Savings & Loan Associations, Medford
- Savings Banks, Medford
- Scrap & Waste Materials, Medford
- Screen Printing, Medford
- Seawall & Shoring Contractors, Medford
- Secondary Schools, Medford
- Secretarial & Court Reporting Services, Medford
- Security & Surveillance System & Equipment, Medford
- Security Alarm Systems - Home & Business, Medford
- Security Brokers & Dealers, Medford
- Security Control Systems & Monitoring, Medford - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Medford
- Septic Tank Installation & Repair, Medford - Septic Systems
- Septic Tank Pumping & Cleaning, Medford - Septic Systems
- Septic Tanks & Septic Systems Contractors, Medford - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems, Medford - Wholesale, Dealers & Suppliers
- Sewing Machine Repair & Service, Medford
- Sheet Metal Contractors, Medford - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Medford
- Shoe Dyers, Medford
- Shoe Repair Shops, Medford
- Shoe Store - More, Medford
- Shoe Stores, Medford - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Medford
- Shoring Contractors, Medford
- Siding Contractors, Medford - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Medford
- Ski Shops - Equipment & Supplies Sales & Rental, Medford
- Ski, Snowboard & Snowmobile Shop - Equipment Rental & Services, Medford
- Snack Foods, Medford
- Snacks & Desserts, Medford
- Snow Removal Services, Medford - Snow Plow Service
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- Social Services & Welfare, Medford
- Social Workers & Services, Medford
- Societies & Foundation Associations, Medford
- Solar Equipment, Medford
- Special Education & Care, Medford
- Special Interest Schools Or Instruction, Medford
- Specialty Animal Services, Medford
- Specialty Stores, Medford
- Sporting & Recreational Camps, Medford
- Sporting Goods Stores, Medford
- Sports Promoters & Managers, Medford
- Sports Promotions & Special Events, Medford
- Sprinkler System Contractors, Medford - Garden & Lawn Sprinkler System Installation & Repair
- Stadiums, Arenas, Coliseums & Athletic Fields, Medford
- Staffing & Support Services, Medford
- State Government, Medford
- Stationery & Office Supplies, Medford
- Steak House Restaurants, Medford
- Stereo, Audio & Video Equipment Dealers & Stores, Medford
- Stock & Bond Brokers & Dealers, Medford
- Stocks & Bond Brokers, Medford
- Stone Setting Contractors, Medford
- Submarine Sandwich Restaurants, Medford
- Substance Abuse Clinics, Medford - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Summer Camps, Medford
- Surgical Hospitals, Medford - Surgical Centers
- Surgical Supplies & Equipment, Medford
- Surgical Supplies, Instruments, Tools & Equipment, Medford
- Swimming, Medford
- Swimming Pool, Sauna & Spa Contractors, Medford
- Swimming Pools, Medford
- Swimming Pools Contractors, Medford - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Medford
- Swimming Pools Supplies, Equipment & Accessories, Medford
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