| Name | School | Sub-Type |
|---|---|---|
| Seattle Maharashtra Mandal | Classification 3 | |
| Seattle Overseas Chinese Assiation | ||
| Seattle Pacific University | ||
| Seattle Saibaba Temple | Classification 3 | |
| Seattle Shaolin Kungfu Acadmey | ||
| Seattle Tamil Sangam | Classification 3 | |
| Seattle Visiting Nurse Association | ||
| Seattle WA State Korean Association | Classification 3 | |
| Seattle Wind Symphony | ||
| Seattle Women Marching Forward | ||
| Sherwood Forest Community Club | ||
| Shirdi Sai Seva Samithi | Classification 3 | |
| Shri Shirdi Sai Seva Samithi | Classification 3 | |
| SkiMasters Ski School | ||
| Smart Coding School | ||
| Somerset cub scouts | Somerset Elementary School | |
| Song of Seattle | Classification 2 | |
| Sounder's Women | ||
| Spanish Immersion Parent | ||
| Speed Unlimited | ||
| Spotlight Dance | ||
| Srini Acharya | Classification 4 | |
| St George Church | ||
| St Louise School | Classification 3 | |
| St. Joseph of Peace | ||
| St. Madeleine Sophie School | Classification 3 | |
| St. Thomas School | Classification 3 | |
| Sudden Impact | ||
| Sudden Impact Volleyball | Classification 3 | |
| Suplex City Wrestling | Bellevue High School, Bellevue School Di... |
