- Sandwich Shop Restaurants, Chelsea
- Satellite & Cable TV Equipment & Systems Repair & Service, Chelsea
- Satellite Dish Antennas & Equipment Dealers, Chelsea
- Satellite TV Service, Chelsea
- Savings & Loan Associations, Chelsea
- Savings Banks, Chelsea
- Scrap & Waste Materials, Chelsea
- Secondary Schools, Chelsea
- Secretarial & Court Reporting Services, Chelsea
- Security Brokers & Dealers, Chelsea
- Security Guard & Patrol Service, Chelsea - Bodyguard, Guard Dogs, Etc
- Security Investigative Services, Chelsea
- Security Services, Chelsea
- Septic Tank Installation & Repair, Chelsea - Septic Systems
- Septic Tank Pumping & Cleaning, Chelsea - Septic Systems
- Septic Tanks & Septic Systems Contractors, Chelsea - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Shoe Store - More, Chelsea
- Shopping & Shopping Services, Chelsea
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- Skin Care & Cosmetology Salons, Chelsea
- Skin Care Products & Treatments, Chelsea
- Snacks & Desserts, Chelsea
- Social Services & Welfare, Chelsea
- Social Workers & Services, Chelsea
- Societies & Foundation Associations, Chelsea
- Special Interest Schools Or Instruction, Chelsea
- Specialty Animal Services, Chelsea
- Specialty Stores, Chelsea
- Speech & Hearing Specialists, Chelsea
- Sports Medicine, Chelsea - Doctors, Physicians & Surgeons
- Staffing & Support Services, Chelsea
- Stamp Collecting & Coin Dealers , Chelsea
- Stampings Non Metallic Manufacturers, Chelsea
- State Government, Chelsea
- Stocks & Bond Brokers, Chelsea
- Stoves & Furnace Equipment, Chelsea - Fittings & Repair Parts
- Surgical Hospitals, Chelsea - Surgical Centers
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