- Sales & Marketing Consultant, Acton
- Salvation Army, Acton
- Sand Gravel & Aggregate, Acton
- Sandwich Shop Restaurants, Acton
- Secondary Schools, Acton
- Security Brokers & Dealers, Acton
- Senior Citizens Housing, Acton
- Senior Citizens Service & Health Organizations, Acton
- Septic Tank Pumping & Cleaning, Acton - Septic Systems
- Sewer & Drain Cleaning & Repair, Acton - Drain Cleaner & Installation Services
- Shopping & Shopping Services, Acton
- Snacks & Desserts, Acton
- Soccer Clubs, Acton
- Social Clubs & Organizations, Acton
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- Social Services & Welfare, Acton
- Societies & Foundation Associations, Acton
- Special Coatings, Acton - Protective Coatings
- Special Interest Schools Or Instruction, Acton
- Specialty Stores, Acton
- Sporting Goods Stores, Acton
- Stadiums, Arenas, Coliseums & Athletic Fields, Acton
- Stock & Bond Brokers & Dealers, Acton
- Stocks & Bond Brokers, Acton
- Submarine Sandwich Restaurants, Acton
- Substance Abuse Outpatient Clinics, Acton
- Surveyor Services, Acton - Surveying Service
- Swimming Pools, Acton
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