- Salvation Army, Chelsea
- Sandwich Shop Restaurants, Chelsea
- Satellite & Cable TV Equipment & Systems, Chelsea
- Satellite Communication Downlinking & Uplinking, Chelsea
- Satellite Descrambling & Programming Service, Chelsea
- Satellite Dish Antennas & Equipment Dealers, Chelsea
- Satellite TV Service, Chelsea
- School Bus Transportation, Chelsea
- Scientific Equipment & Services, Chelsea
- Scientific Services, Chelsea
- Scrap & Waste Materials, Chelsea
- Seafood Restaurants, Chelsea
- Secondary Schools, Chelsea
- Secretarial & Court Reporting Services, Chelsea
- Security Alarm Systems - Home & Business, Chelsea
- Security Control Systems & Monitoring, Chelsea - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, Chelsea - Bodyguard, Guard Dogs, Etc
- Security Services, Chelsea
- Senior Citizens Information & Services, Chelsea
- Sheet Metal, Chelsea
- Sheet Metal Work - Aluminum, Tin, Stainless Steel, etc, Chelsea - Sheet Metal Products
- Sheriff's Department, Chelsea
- Ship & Boat Building & Repairing, Chelsea
- Shoe Stores, Chelsea - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Chelsea
- Signs, Chelsea
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- Small Appliances, Chelsea
- Snacks & Desserts, Chelsea
- Social Clubs & Organizations, Chelsea
- Social Services & Welfare, Chelsea
- Societies & Foundation Associations, Chelsea
- Solar Energy Companies - Contractors, Chelsea - Solar Panel Installation - Solar Power Systems
- Solar Energy Equipment & Systems - Service & Repair, Chelsea - Solar Power Systems
- Sound Systems & Recording Equipment, Chelsea
- South American Restaurants, Chelsea
- Special Events & Party Supply Rental, Chelsea
- Special Interest Schools Or Instruction, Chelsea
- Special Needs Transportation, Chelsea
- Speciality Food Stores, Chelsea
- Specialty Stores, Chelsea
- Sportswear Clothing Stores, Chelsea - Sports Clothes
- Springs Coil Flat - Industrial Supply & Equipment, Chelsea
- Springs Coil Flat Etcetera Manufacturers, Chelsea
- Staffing & Support Services, Chelsea
- State Government, Chelsea
- Steel Springs Manufacturers Except Wire, Chelsea
- Submarine Sandwich Restaurants, Chelsea
- Substance Abuse Clinics, Chelsea - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Substance Abuse Services, Chelsea
- Surveyor Services, Chelsea - Surveying Service
- Sweepers & Scrubbers Industrial, Chelsea - Sweeping Service
- Synagogues & Temples, Chelsea
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