- Sandwich Shop Restaurants, Summerville
- Savings Banks, Summerville
- Scientific & Laboratory Equipment & Instruments, Summerville
- Scrap & Waste Machinery, Summerville
- Scrap & Waste Materials, Summerville
- Secondary Schools, Summerville
- Security Brokers & Dealers, Summerville
- Sheriff's Department, Summerville
- Shipping Service, Summerville
- Shopping & Shopping Services, Summerville
- Snack Foods, Summerville
- Social Security Counselors & Representatives, Summerville
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- Social Services & Welfare, Summerville
- Special Education & Care, Summerville
- Special Interest Schools Or Instruction, Summerville
- Specialty Animal Services, Summerville
- Specialty Stores, Summerville
- Sporting Goods Stores, Summerville
- Sports Medicine, Summerville - Doctors, Physicians & Surgeons
- Staffing & Support Services, Summerville
- State Government, Summerville
- State Parks, Summerville
- Stocks & Bond Brokers, Summerville
- Surveyor Services, Summerville - Surveying Service
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