- Sand Gravel & Aggregate, Petersburg
- Sandwich Shop Restaurants, Petersburg
- Secondary Schools, Petersburg
- Security Brokers & Dealers, Petersburg
- Seeds & Bulbs Wholesale & Growers, Petersburg
- Senior Citizens Service & Health Organizations, Petersburg
- Shopping & Shopping Services, Petersburg
- Smoked Meat Restaurants, Petersburg
- Social Services & Welfare, Petersburg
- Societies & Foundation Associations, Petersburg
- Special Interest Schools Or Instruction, Petersburg
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- Specialty Animal Services, Petersburg
- Specialty Stores, Petersburg
- State Government, Petersburg
- Steel Erection Contractors, Petersburg - Steel Erectors
- Stock & Bond Brokers & Dealers, Petersburg
- Stocks & Bond Brokers, Petersburg
- Stone, Petersburg
- Stone & Rock Quarry, Petersburg - Gravel Pit, Shale, Granite, Limestone, Crushed Rock, etc
- Submarine Sandwich Restaurants, Petersburg
- Substance Abuse Clinics, Petersburg - Alcoholism, Addiction & Drug Abuse Treatment Centers
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