- Sales & Marketing Consultant, Rockford
- Sand Gravel & Aggregate, Rockford
- Sandblasting, Rockford - General Contractors
- Sandwich Shop Restaurants, Rockford
- Satellite Dish Antennas & Equipment Dealers, Rockford
- Sawdust & Shavings, Rockford
- Sawmill & Planing Mills, Rockford
- Sawmill Supplies & Equipment Repair, Rockford
- Science & Academic Consultants, Rockford
- Scrap & Waste Materials, Rockford
- Screen Printing, Rockford
- Secondary Schools, Rockford
- Security Brokers & Dealers, Rockford
- Senior Citizens Housing, Rockford
- Septic Tank Installation & Repair, Rockford - Septic Systems
- Septic Tank Pumping & Cleaning, Rockford - Septic Systems
- Septic Tanks & Septic Systems Contractors, Rockford - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems, Rockford - Wholesale, Dealers & Suppliers
- Sewer & Drain Cleaning & Repair, Rockford - Drain Cleaner & Installation Services
- Sewing & Yarn Stores & Supplies, Rockford
- Shoe Stores, Rockford - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Rockford
- Siding Contractors, Rockford - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Sign Supplies & Sign Making Equipment, Rockford
- Signs, Rockford
- Ski Centers, Rockford
- Ski Resorts, Rockford
- Small Appliances, Rockford
- Snack Foods, Rockford
- Snacks & Desserts, Rockford
- Snow Removal Services, Rockford - Snow Plow Service
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- Snowmobile Repair, Parts, Sales & Service, Rockford
- Soccer Equipment & Supplies, Rockford
- Social Services & Welfare, Rockford
- Societies & Foundation Associations, Rockford
- Solar Energy Companies - Contractors, Rockford - Solar Panel Installation - Solar Power Systems
- Special Coatings, Rockford - Protective Coatings
- Special Dies Tools Jigs & Fixtures Manufacturers, Rockford
- Special Interest Schools Or Instruction, Rockford
- Special Needs Transportation, Rockford
- Specialty Animal Services, Rockford
- Specialty Stores, Rockford
- Speech & Hearing Specialists, Rockford
- Sporting Goods Stores, Rockford
- Sports Agents, Rockford
- Sports Bars & Lounges, Rockford
- Sports Promoters & Managers, Rockford
- Sports Promotions & Special Events, Rockford
- Sportswear Clothing Stores, Rockford - Sports Clothes
- Sprinkler System Contractors, Rockford - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, Rockford
- State Government, Rockford
- Steel & Metal Goods, Rockford - Steel Distributors
- Stereo, Audio & Video Equipment Dealers & Stores, Rockford
- Stocks & Bond Brokers, Rockford
- Store Fronts, Rockford - Storefront
- Stoves & Furnace Equipment, Rockford - Fittings & Repair Parts
- Submarine Sandwich Restaurants, Rockford
- Surveyor Services, Rockford - Surveying Service
- Swimming Pools, Rockford
- Swimming Pools Supplies, Equipment & Accessories, Rockford
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