- Sand Gravel & Aggregate, Yarmouth
- Sandwich Shop Restaurants, Yarmouth
- Satellite & Cable TV Equipment & Systems Repair & Service, Yarmouth
- Scrap & Waste Materials, Yarmouth
- Seafood Restaurants, Yarmouth
- Seaweed Products, Yarmouth
- Secondary Schools, Yarmouth
- Security Alarm Systems - Home & Business, Yarmouth
- Security Brokers & Dealers, Yarmouth
- Security Control Systems & Monitoring, Yarmouth - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, Yarmouth - Bodyguard, Guard Dogs, Etc
- Security Services, Yarmouth
- Senior Citizens Housing, Yarmouth
- Senior Citizens Service & Health Organizations, Yarmouth
- Septic Tank Pumping & Cleaning, Yarmouth - Septic Systems
- Sewing & Yarn Stores & Supplies, Yarmouth
- Sewing Machine Repair & Service, Yarmouth
- Sewing Machines, Equipment & Supplies, Yarmouth
- Sheriff's Department, Yarmouth
- Shoe Stores, Yarmouth - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Yarmouth
- Signs, Yarmouth
- Sleep Disorders Treatment & Information Centers, Yarmouth
- Small Appliances, Yarmouth
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- Snacks & Desserts, Yarmouth
- Snow Removal Services, Yarmouth - Snow Plow Service
- Social Services & Welfare, Yarmouth
- Societies & Foundation Associations, Yarmouth
- Special Education & Care, Yarmouth
- Special Events Photographers, Yarmouth
- Special Interest Schools Or Instruction, Yarmouth
- Special Needs Transportation, Yarmouth
- Speciality Food Stores, Yarmouth
- Specialty Stores, Yarmouth
- Speech & Hearing Specialists, Yarmouth
- Speech Pathologists, Yarmouth - Speech & Language Therapy
- Sporting Goods Stores, Yarmouth
- Sportswear Clothing Stores, Yarmouth - Sports Clothes
- Staffing & Support Services, Yarmouth
- Steak House Restaurants, Yarmouth
- Steel Manufacturers, Yarmouth
- Stock & Bond Brokers & Dealers, Yarmouth
- Stocks & Bond Brokers, Yarmouth
- Stone & Rock Quarry, Yarmouth - Gravel Pit, Shale, Granite, Limestone, Crushed Rock, etc
- Stoves & Furnace Equipment, Yarmouth - Fittings & Repair Parts
- Substance Abuse Outpatient Clinics, Yarmouth
- Surveyor Services, Yarmouth - Surveying Service
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