- School - Christian, Marriottsville
- Secondary Schools, Marriottsville
- Security & Surveillance System & Equipment, Marriottsville
- Security Services, Marriottsville
- Shopping & Shopping Services, Marriottsville
- Skin Care & Cosmetology Salons, Marriottsville
- Skin Care Products & Treatments, Marriottsville
- Sleep Disorders Treatment & Information Centers, Marriottsville
- Sleep Doctors, Marriottsville - Specialists, Physicians & Surgeons (Sleep Medicine)
- Social Services & Welfare, Marriottsville
- Societies & Foundation Associations, Marriottsville
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- Special Interest Schools Or Instruction, Marriottsville
- Specialty Stores, Marriottsville
- Spiritual Church, Marriottsville
- Sporting & Recreational Camps, Marriottsville
- Staffing & Support Services, Marriottsville
- State Government, Marriottsville
- Structural Engineer, Marriottsville
- Summer Camps, Marriottsville
- Swimming Pools Management Services, Marriottsville
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Marriottsville
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