- Sales & Marketing Consultant, Wellesley
- Scientific Equipment & Services, Wellesley
- Scientific Services, Wellesley
- Scientology Churches, Wellesley
- Sealcoating, Wellesley - Asphalt Sealcoating & Paving
- Secondary Schools, Wellesley
- Security Alarm Systems - Home & Business, Wellesley
- Security Brokers & Dealers, Wellesley
- Security Control Systems & Monitoring, Wellesley - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Wellesley
- Sewer & Drain Cleaning & Repair, Wellesley - Drain Cleaner & Installation Services
- Sewing Machines, Equipment & Supplies, Wellesley
- Shoe Stores, Wellesley - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Wellesley
- Short Term Business Credit Institutions, Wellesley
- Shutters - Interior & Exterior, Wellesley - Wood, Vinyl, Window, Plantation Shutters, etc
- Signs, Wellesley
- Silversmiths & Goldsmiths, Wellesley
- Silverware & Plated Ware, Wellesley
- Skating Supplies, Wellesley - Ice, Inline, Speed, Figure & Roller Skates
- Skin Care & Cosmetology Salons, Wellesley
- Skin Care Products & Treatments, Wellesley
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- Small Appliances, Wellesley
- Snacks & Desserts, Wellesley
- Snow Removal Services, Wellesley - Snow Plow Service
- Social Clubs & Organizations, Wellesley
- Social Service Organizations Educational Information, Wellesley
- Social Services & Welfare, Wellesley
- Social Workers & Services, Wellesley
- Societies & Foundation Associations, Wellesley
- Special Interest Schools Or Instruction, Wellesley
- Specialty Animal Services, Wellesley
- Specialty Stores, Wellesley
- Sporting & Recreational Camps, Wellesley
- Sporting Goods Stores, Wellesley
- Sports & Recreational Services, Wellesley
- Sportswear Clothing Stores, Wellesley - Sports Clothes
- Sportswear Manufacturers, Wellesley
- Sprinkler System Contractors, Wellesley - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, Wellesley
- Stamp Collecting & Coin Dealers , Wellesley
- Stock & Bond Brokers & Dealers, Wellesley
- Stocks & Bond Brokers, Wellesley
- Storage & Closet Equipment Supplies & Materials, Wellesley
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