- Salvation Army, Campbellford
- Sandwich Shop Restaurants, Campbellford
- Satellite & Cable TV Equipment & Systems Repair & Service, Campbellford
- Satellite Dish Antennas & Equipment Dealers, Campbellford
- Scrap & Waste Machinery, Campbellford
- Scrap & Waste Materials, Campbellford
- Screen Printing, Campbellford
- Seafood Restaurants, Campbellford
- Secondary Schools, Campbellford
- Security Brokers & Dealers, Campbellford
- Senior Citizens Housing, Campbellford
- Septic Systems Installation & Repair, Campbellford
- Septic Tanks & Septic Systems Contractors, Campbellford - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Service Establishment Supplies & Equipment, Campbellford
- Sewing Machine Repair & Service, Campbellford
- Sewing Machines, Equipment & Supplies, Campbellford
- Shopping & Shopping Services, Campbellford
- Siding Contractors, Campbellford - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
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- Small Appliances, Campbellford
- Social Services & Welfare, Campbellford
- Societies & Foundation Associations, Campbellford
- Special Events & Party Supply Rental, Campbellford
- Speciality Food Stores, Campbellford
- Specialty Animal Services, Campbellford
- Specialty Rental Services, Campbellford
- Specialty Stores, Campbellford
- Sporting Goods Stores, Campbellford
- Sprinkler Alarm Systems, Campbellford - Fire Sprinkler Systems
- Storm Doors & Windows, Campbellford
- Stove, Oven, Range & Cooktop Parts & Supplies, Campbellford
- Stoves & Furnace Equipment, Campbellford - Fittings & Repair Parts
- Submarine Sandwich Restaurants, Campbellford
- Substance Abuse Outpatient Clinics, Campbellford
- Sunroom & Solarium Construction Contractors, Campbellford
- Surveyor Services, Campbellford - Surveying Service
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