- Savings & Loan Associations, Wauwatosa
- Savings Banks, Wauwatosa
- Sawmill, Paper & Woodworking Supplies, Machinery & Equipment, Wauwatosa
- Security & Surveillance System & Equipment, Wauwatosa
- Security Alarm Systems - Home & Business, Wauwatosa
- Security Brokers & Dealers, Wauwatosa
- Security Control Systems & Monitoring, Wauwatosa - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Wauwatosa
- Shoe Store - More, Wauwatosa
- Shoe Stores, Wauwatosa - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Wauwatosa
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- Small Business & Office Equipment Repair Services, Wauwatosa
- Snack Foods, Wauwatosa
- Social Services & Welfare, Wauwatosa
- South American Restaurants, Wauwatosa
- Specialty Stores, Wauwatosa
- Speech & Hearing Specialists, Wauwatosa
- Sporting Goods Stores, Wauwatosa
- Sportswear Clothing Stores, Wauwatosa - Sports Clothes
- Staffing & Support Services, Wauwatosa
- Stocks & Bond Brokers, Wauwatosa
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