- Safety & Security Systems & Consultants, Port Lavaca
- Sand Gravel & Aggregate, Port Lavaca
- Sandwich Shop Restaurants, Port Lavaca
- Satellite & Cable TV Equipment & Systems, Port Lavaca
- Savings Banks, Port Lavaca
- Seafood Restaurants, Port Lavaca
- Secondary Schools, Port Lavaca
- Security & Surveillance System & Equipment, Port Lavaca
- Security Brokers & Dealers, Port Lavaca
- Security Guard & Patrol Service, Port Lavaca - Bodyguard, Guard Dogs, Etc
- Security Services, Port Lavaca
- Senior Citizens Information & Services, Port Lavaca
- Senior Citizens Service & Health Organizations, Port Lavaca
- Sewing & Yarn Stores & Supplies, Port Lavaca
- Shoe Repair Shops, Port Lavaca
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- Shoe Stores, Port Lavaca - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Port Lavaca
- Sleep Disorders Treatment & Information Centers, Port Lavaca
- Snacks & Desserts, Port Lavaca
- Social Services & Welfare, Port Lavaca
- Specialty Goods Storage, Port Lavaca
- Specialty Stores, Port Lavaca
- Sporting Goods Stores, Port Lavaca
- Sports Bars & Lounges, Port Lavaca
- Staffing & Support Services, Port Lavaca
- State Government, Port Lavaca
- Stocks & Bond Brokers, Port Lavaca
- Substance Abuse Clinics, Port Lavaca - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surveyor Services, Port Lavaca - Surveying Service
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