Schools
| Name | Years | Students |
|---|---|---|
| James Caldwell | 28 | 61 |
| Jamesburg | 3 | 4 |
| Jamestown | 1 | 1 |
| Jefferson Township | 26 | 69 |
| Jefferson, Elizabeth | 1 | 1 |
| Jersey City | 5 | 59 |
| Jersey City, Ferris | 1 | 6 |
| Jersey City, Lincoln | 1 | 1 |
| John F. Kennedy | 14 | 37 |
| Johnson Regional | 2 | 6 |
| Jonathan Dayton Regional | 1 | 5 |
| Jonathan Dayton Regional, Springfield | 16 | 49 |
| Kearny | 10 | 19 |
| Kent Place | 1 | 1 |
| Keyport | 4 | 4 |
| King's Christian | 8 | 11 |
| Kingsway Regional | 9 | 16 |
| Kinnelon | 48 | 100 |
| Kittatinny Regional | 42 | 176 |
| Lacey Township | 5 | 7 |