Schools
| Name | Years | Students |
|---|---|---|
| River Dell Regional | 21 | 50 |
| Riverside | 15 | 24 |
| Robbinsville HS | 9 | 25 |
| Roselle | 1 | 3 |
| Roselle Park | 10 | 25 |
| Roxbury | 52 | 355 |
| Rumson-Fair Haven | 23 | 53 |
| Rutgers Prep | 22 | 45 |
| Rutgers University | 1 | 1 |
| Rutherford | 21 | 33 |
| Sacred Heart | 4 | 7 |
| Saddle Brook | 6 | 23 |
| Salem | 17 | 27 |
| Salem | 1 | 1 |
| Sayerville | 11 | 27 |
| Sayerville Jr. | 1 | 1 |
| Sayerville Memorial | 2 | 3 |
| Schalick | 4 | 5 |
| Science | 2 | 2 |
| Scotch Plains | 2 | 2 |