| SOFIA Science Steering Committee | Academic & Science |
| Sitka Sound Science Center | Academic & Science |
| Solar System Science Collaboration | Academic & Science |
| Science Student Success Centre | Academic & Science |
| Student Support Services Center | Academic & Science |
| Southwest Student Services Corporation | Business |
| Senior Secondary School Certificate | Business |
| Street Sweeper Social Club | Community |
| Super Sativa Seed Club | Community |
| Student Systems Steering Committee | Community |
| Silja Symphony Song Contest | Community |
| Speed School Student Council | Community |
| Super Secret Stamp Club | Community |
| Spread Spectrum Security Code | Computing |
| Static Synchronous Series Compensator | General |
| Synchronous Static Series Compensator | General |
| Semjase Silver Star Center | General |
| Speech Sign Success Center | General |
| Staff Scientist Staff Clinician | General |
| Surface Ship Support Center | General |
| Static Series Synchronous Compensator | General |
| Sunday Spot Social Circle | General |
| Surface Subsurface Surveillance Coordination | General |
| Stainless Steel Separation Conveyor | General |
| Superior Shoulder Suspensory Complex | General |
| Small Sagittarius Star Cloud | General |
| Single Sideband Suppressed Carrier | General |
| Storm Sewer System Charge | General |
| Stainless Steel Scissor Carts | General |
| Suzuki Swift Sport Cup | General |
| Scottish Social Services Council | Governmental |
| Supreme State Security Court | Governmental |
| Self Service Supply Center | Governmental |
| Surface, Subsurface Search Surveillance Coordination | Governmental |
| Senior Services of Snohomish County | Regional |
