Kingco Athletic Conference 3A Members 3A Members

| Institution | Location_ | Founded | Affiliation | Enrollment | Nickname |
|---|---|---|---|---|---|
| Bellevue | Bellevue | 1923 | Public ( Bellevue S.D. ) | 1327 | Wolverines |
| Interlake | Bellevue | 1968 | Public ( Bellevue S.D. ) | 1341 | s Saint |
| Juanita | Kirkland | 1971 | Public ( Lake Washington S.D. ) | 1010 | Rebels |
| Liberty | Renton | 1977 | Public ( Issaquah S.D. ) | 1237 | Patriots |
| Mercer Island | Mercer Island | 1957 | Public ( Mercer Island S.D. ) | 1424 | ers Island |