| The Greenwich Japanese School | 2.1 |
Regular elementary or secondary | 1-9 | 180 | 7.0 | Nonsectarian |
| Greenwich Academy | 2.4 |
Regular elementary or secondary | Pre-KG-12 | 772 | 8.1 | Nonsectarian |
| Brunswick School | 2.6 |
Regular elementary or secondary | Pre-KG-12 | 861 | 5.6 | Nonsectarian |
| Eagle Hill School | 3.4 |
Special education | Ungraded-Ungraded | 230 | 3.1 | Nonsectarian |
| Villa Maria Education Center | 5.5 |
Special education | KG-9 | 71 | 3.3 | Roman Catholic |
| New Canaan Country School | 5.9 |
Regular elementary or secondary | Pre-KG-9 | 565 | 5.9 | Nonsectarian |
| Pierrepont School | 12.8 |
Regular elementary or secondary | KG-10 | 45 | 2.6 | Nonsectarian |
| Greens Farms Academy | 15.4 |
Regular elementary or secondary | KG-12 | 624 | 8.1 | Nonsectarian |
| Eagle Hill - Southport | 17.3 |
Special education | Ungraded-Ungraded | 111 | 3.9 | Nonsectarian |
| Giant Steps Connecticut | 17.5 |
Special education | KG-12 | 39 | 6.4 | Nonsectarian |
| Fairfield Country Day School | 17.7 |
Regular elementary or secondary | KG-9 | 271 | 6.6 | Nonsectarian |
| Phoenix Academy | 20.3 |
Regular elementary or secondary | Pre-KG-9 | 89 | 6.3 | Nonsectarian |
| St Catherine Academy | 20.3 |
Special education | Ungraded-Ungraded | 15 | 5.0 | Roman Catholic |
| Wooster School | 21.2 |
Regular elementary or secondary | KG-12 | 343 | 6.4 | Episcopal |
| Christian Heritage School | 24.7 |
Regular elementary or secondary | KG-12 | 528 | 11.5 | Christian (no specific denomination) |
| St Dominic's Academy | 24.7 |
Regular elementary or secondary | KG-12 | 20 | 5.0 | Roman Catholic |
