- Salvage Yards, Junk Yards & Wrecker Service, Pontiac
- Salvation Army, Pontiac
- Sand Gravel & Aggregate, Pontiac
- Sandwich Shop Restaurants, Pontiac
- Satellite TV Service, Pontiac
- Scales Retail, Pontiac
- School - Catholic, Pontiac
- School - Christian, Pontiac
- School Bus Transportation Service, Pontiac
- Secondary Schools, Pontiac
- Secretarial & Court Reporting Services, Pontiac
- Security Alarm Systems - Home & Business, Pontiac
- Security Brokers & Dealers, Pontiac
- Security Services, Pontiac
- Seeds & Bulbs Wholesale & Growers, Pontiac
- Senior Citizens Service & Health Organizations, Pontiac
- Septic Tanks & Systems, Pontiac - Wholesale, Dealers & Suppliers
- Sheet Metal Contractors, Pontiac - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Pontiac
- Shoe Dyers, Pontiac
- Shoe Repair Shops, Pontiac
- Shoe Stores, Pontiac - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Pontiac
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- Signs, Pontiac
- Sleep Doctors, Pontiac - Specialists, Physicians & Surgeons (Sleep Medicine)
- Snowmobile Dealers, Pontiac - Parts, Gear, Clothing & Accessories
- Social Services & Welfare, Pontiac
- Societies & Foundation Associations, Pontiac
- Special Education & Care, Pontiac
- Specialty Stores, Pontiac
- Speech & Hearing Specialists, Pontiac
- Sporting Goods Stores, Pontiac
- Sports Bars & Lounges, Pontiac
- Staffing & Support Services, Pontiac
- Stamp Collecting & Coin Dealers , Pontiac
- State Government, Pontiac
- Steel Manufacturers, Pontiac
- Stereo, Audio & Video Equipment Dealers & Stores, Pontiac
- Stock & Bond Brokers & Dealers, Pontiac
- Stocks & Bond Brokers, Pontiac
- Stone & Rock Quarry, Pontiac - Gravel Pit, Shale, Granite, Limestone, Crushed Rock, etc
- Store Fixtures & Display Equipment, Pontiac
- Stoves & Furnace Equipment, Pontiac - Fittings & Repair Parts
- Submarine Sandwich Restaurants, Pontiac
- Support Services, Pontiac
- Surveyor Services, Pontiac - Surveying Service
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