- Sand Gravel & Aggregate, Medford
- Sandwich Shop Restaurants, Medford
- Satellite Dish Antennas & Equipment Dealers, Medford
- Satellite TV Service, Medford
- Sawmill & Planing Mills, Medford
- Sawmill Supplies & Equipment Repair, Medford
- Scrap & Waste Materials, Medford
- Screen Printing, Medford
- Seafood Restaurants, Medford
- Secondary Schools, Medford
- Security Brokers & Dealers, Medford
- Senior Citizens Service & Health Organizations, 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
- Septic Tanks & Systems Contractors & Designers, Medford
- Shirts & T-Shirts, Medford
- Shopping & Shopping Services, Medford
- Siding Contractors, Medford - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Medford
- Silos & Equipment, Medford
- Snacks & Desserts, Medford
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- Snow Removal Services, Medford - Snow Plow Service
- Snowmobile Dealers, Medford - Parts, Gear, Clothing & Accessories
- Social Services & Welfare, Medford
- Societies & Foundation Associations, Medford
- Soil Testing Labs, Medford - Concrete Testing
- Special Events Photographers, Medford
- Special Interest Schools Or Instruction, Medford
- Specialty Animal Services, Medford
- Specialty Stores, Medford
- Speech & Hearing Specialists, Medford
- Speech Pathologists, Medford - Speech & Language Therapy
- Sporting Goods Stores, Medford
- Stadiums, Arenas, Coliseums & Athletic Fields, Medford
- Staffing & Support Services, Medford
- State Government, Medford
- Steak House Restaurants, Medford
- Stocks & Bond Brokers, Medford
- Substance Abuse Clinics, Medford - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Suicide Prevention Service & Counseling, Medford
- Supper Club Restaurants, Medford
- Surveyor Services, Medford - Surveying Service
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Medford
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