- Sandwich Shop Restaurants, Littleton
- Sanitation Consultants, Littleton
- Satellite Dish Antennas & Equipment Dealers, Littleton
- Sawmill & Planing Mills, Littleton
- Sawmill Supplies & Equipment Repair, Littleton
- Schools Montessori Instruction, Littleton
- Screen Printing, Littleton
- Secondary Schools, Littleton
- Security & Surveillance System & Equipment, Littleton
- Security Brokers & Dealers, Littleton
- Security Services, Littleton
- Senior Citizens Information & Services, Littleton
- Sewing & Yarn Stores & Supplies, Littleton
- Sewing Machines, Equipment & Supplies, Littleton
- Shoe Stores, Littleton - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Littleton
- Small Appliances, Littleton
- Smoked Meat Restaurants, Littleton
- Snacks & Desserts, Littleton
- Snowmobile Dealers, Littleton - Parts, Gear, Clothing & Accessories
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- Social Services & Welfare, Littleton
- Social Workers & Services, Littleton
- Special Education & Care, Littleton
- Special Events & Party Supply Rental, Littleton
- Specialty Animal Services, Littleton
- Specialty Goods Storage, Littleton
- Specialty Stores, Littleton
- Sporting Goods Equipment Rental, Littleton
- Sporting Goods Stores, Littleton
- Staffing & Support Services, Littleton
- Stairs, Balcony, Terrace & Steeple Contractors, Littleton
- State Government, Littleton
- Stationery & Office Supplies, Littleton
- Steel Manufacturers, Littleton
- Steeples & Spires, Littleton
- Stocks & Bond Brokers, Littleton
- Stone Setting Contractors, Littleton
- Structural Engineer, Littleton
- Surplus & Salvage Merchandise, Littleton
- Surveyor Services, Littleton - Surveying Service
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