- Sandwich Shop Restaurants, Cudahy
- School - Catholic, Cudahy
- School - Christian, Cudahy
- Scrap & Waste Materials, Cudahy
- Screen Printing, Cudahy
- Secondary Schools, Cudahy
- Security & Surveillance System & Equipment, Cudahy
- Security Alarm Systems - Home & Business, Cudahy
- Security Brokers & Dealers, Cudahy
- Security Services, Cudahy
- Sewing & Yarn Stores & Supplies, Cudahy
- Shipping Companies, Cudahy
- Shooting & Target Ranges, Cudahy
- Shopping & Shopping Services, Cudahy
- Siding Contractors, Cudahy - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Skating Rink & Hockey Operation Services, Cudahy
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- Sleep Disorders Treatment & Information Centers, Cudahy
- Social Service Organizations Volunteer Services, Cudahy
- Social Services & Welfare, Cudahy
- Solder Equipment & Service, Cudahy
- Special Dies Tools Jigs & Fixtures Manufacturers, Cudahy
- Specialty Stores, Cudahy
- Sporting Goods Stores, Cudahy
- Sports Clubs, Cudahy
- Staffing & Support Services, Cudahy
- Steel & Metal Goods, Cudahy - Steel Distributors
- Steel Manufacturers, Cudahy
- Stocks & Bond Brokers, Cudahy
- Store Fixtures, Cudahy
- Store Fronts, Cudahy - Storefront
- Surplus & Salvage Merchandise, Cudahy
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