- Sandwich Shop Restaurants, Dumas
- Satellite Descrambling & Programming Service, Dumas
- Satellite Dish Antennas & Equipment Dealers, Dumas
- Satellite TV Service, Dumas
- Savings & Loan Associations, Dumas
- Savings Banks, Dumas
- School - Christian, Dumas
- Seafood Restaurants, Dumas
- Secondary Schools, Dumas
- Seed & Grain Cleaning, Dumas
- Seeds & Bulbs Wholesale & Growers, Dumas
- Senior Citizens Service & Health Organizations, Dumas
- Septic Tanks & Systems, Dumas - Wholesale, Dealers & Suppliers
- Sewer & Drain Cleaning & Repair, Dumas - Drain Cleaner & Installation Services
- Sewing & Yarn Stores & Supplies, Dumas
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- Sheet Metal Contractors, Dumas - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Dumas
- Shopping & Shopping Services, Dumas
- Snack Foods, Dumas
- Social Services & Welfare, Dumas
- Social Workers & Services, Dumas
- Specialty Stores, Dumas
- Sporting Goods Stores, Dumas
- Staffing & Support Services, Dumas
- State Government, Dumas
- Steel Manufacturers, Dumas
- Steel Mills & Blast Furnaces, Dumas
- Stone Setting Contractors, Dumas
- Surgical Hospitals, Dumas - Surgical Centers
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