- Sales & Marketing Consultant, Plainsboro
- Sandwich Shop Restaurants, Plainsboro
- Savings & Loan Associations, Plainsboro
- Savings Banks, Plainsboro
- Scholarships & Financial Aid, Plainsboro
- Schools Montessori Instruction, Plainsboro
- Screen Printing, Plainsboro
- Search & Rescue, Plainsboro
- Secondary Schools, Plainsboro
- Security & Surveillance System & Equipment, Plainsboro
- Security Brokers & Dealers, Plainsboro
- Security Services, Plainsboro
- Shooting & Target Ranges, Plainsboro
- Shopping & Shopping Services, Plainsboro
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- Snacks & Desserts, Plainsboro
- Social Services & Welfare, Plainsboro
- Social Workers & Services, Plainsboro
- Special Education & Care, Plainsboro
- Special Interest Schools Or Instruction, Plainsboro
- Specialty Stores, Plainsboro
- Speech & Hearing Specialists, Plainsboro
- Sports Medicine, Plainsboro - Doctors, Physicians & Surgeons
- Staffing & Support Services, Plainsboro
- Steak House Restaurants, Plainsboro
- Steamship Companies & Agencies, Plainsboro
- Stock & Bond Brokers & Dealers, Plainsboro
- Stocks & Bond Brokers, Plainsboro
- Stress Management & Counseling, Plainsboro
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