- Safety Equipment & Supplies, Douglas
- Sand Gravel & Aggregate, Douglas
- Savings Banks, Douglas
- Secondary Schools, Douglas
- Secretarial & Court Reporting Services, Douglas
- Security Alarm Systems - Home & Business, Douglas
- Security Brokers & Dealers, Douglas
- Security Control Systems & Monitoring, Douglas - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Douglas
- Sheet Metal Contractors, Douglas - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Douglas
- Shoe Dyers, Douglas
- Shoe Repair & Shoeshine Parlors, Douglas
- Shoe Repair Shops, Douglas
- Shoe Stores, Douglas - Mens, Womens & Kids Shoes
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- Shopping & Shopping Services, Douglas
- Snack Foods, Douglas
- Snacks & Desserts, Douglas
- Social Services & Welfare, Douglas
- Special Events & Party Supply Rental, Douglas
- Specialty Animal Services, Douglas
- Specialty Stores, Douglas
- Sporting Goods Stores, Douglas
- Staffing & Support Services, Douglas
- State Government, Douglas
- Stationery & Office Supplies, Douglas
- Stereo, Audio & Video Equipment Dealers & Stores, Douglas
- Stocks & Bond Brokers, Douglas
- Stone, Douglas
- Sushi Restaurants, Douglas
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