- Sandwich Shop Restaurants, Monticello
- School - Christian, Monticello
- Secondary Schools, Monticello
- Security Brokers & Dealers, Monticello
- Senior Citizens Service & Health Organizations, Monticello
- Sewer Construction Contractors, Monticello - Sewer Line, Pipe Installation & Repair Services
- Shopping & Shopping Services, Monticello
- Signs, Monticello
- Snack Foods, Monticello
- Social Clubs & Organizations, Monticello
- Social Services & Welfare, Monticello
- Sod & Sodding Service, Monticello
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- Speciality Food Stores, Monticello
- Specialty Animal Services, Monticello
- Specialty Stores, Monticello
- Sporting Goods Stores, Monticello
- Sprinkler System Contractors, Monticello - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, Monticello
- State Government, Monticello
- Steel Manufacturers, Monticello
- Stocks & Bond Brokers, Monticello
- Substance Abuse Clinics, Monticello - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surveyor Services, Monticello - Surveying Service
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