| St. Mary Elementary School | Bethel | PreK-8 | 150 | 12.9 | Roman Catholic |
| Bridgeport Hope School | Bridgeport | K-8 | 39 | 5.3 | Christian (nondenominational) |
| Catholic Academy of Bridgeport/St. Raphael Academy | Bridgeport | PreK-3 | 179 | 20.3 | Roman Catholic |
| Covenant School of Bridgeport | Bridgeport | 5-6 | 21 | 3.2 | Nonsectarian, all-boys |
| Fairfield County SDA School | Bridgeport | K-8 | 27 | 7.7 | Seventh-Day Adventist |
| Kolbe Cathedral High School | Bridgeport | 9-12 | 329 | 14.1 | Roman Catholic |
| St. Andrew Academy | Bridgeport | PreK-8 | 225 | 16.9 | Roman Catholic |
| St. Ann Academy | Bridgeport | K-8 | 179 | 22.4 | Roman Catholic |
| St. Augustine Academy | Bridgeport | 4-8 | 189 | 13.6 | Roman Catholic |
| The University School | Bridgeport | 8-12 | 36 | 5.1 | Nonsectarian |
| Christian Life Academy | Brookfield | PreK-8 | 81 | 5.1 | Christian (nondenominational) |
| Hudson Country Montessori School | Danbury | PreK-8 | 53 | not reported | Nonsectarian |
| Immaculate High School | Danbury | 9-12 | 375 | 12.2 | Roman Catholic |
| Immanuel Lutheran School | Danbury | PreK-8 | 55 | 6.5 | Lutheran Church (Missouri Synod) |
| St. Gregory the Great School | Danbury | PreK-8 | 244 | 18.3 | Roman Catholic |
| St. Peter School | Danbury | PreK-8 | 245 | 13.9 | Roman Catholic |
| Wooster School | Danbury | 5-12 | 310 | 6.7 | Episcopal |
| Easton Country Day School | Easton | PreK-12 | 159 | 5.3 | Nonsectarian |
| Assumption Catholic School | Fairfield | PreK-8 | 142 | 11.5 | Roman Catholic |
| Fairfield College Preparatory | Fairfield | 9-12 | 787 | 17.1 | Roman Catholic, all-boys |
| Fairfield Country Day School | Fairfield | K-9 | 198 | 5 | Nonsectarian, all-boys |
| Fusion Academy FF: Fairfield | Fairfield | 8-12 | 32 | 2.3 | Nonsectarian |
| Great Beginnings Montessori School | Fairfield | PreK-K | 18 | 3 | Nonsectarian |
| Notre Dame Catholic High School | Fairfield | 9-12 | 500 | 16.9 | Roman Catholic |
| St. Catherine Academy | Fairfield | 5-12 | 18 | 4.5 | Roman Catholic |
| St. Thomas Aquinas Catholic School | Fairfield | PreK-8 | 293 | 7.3 | Roman Catholic |
| The Hunt Ridge Montessori School | Fairfield | PreK-K | 10 | not reported | Nonsectarian |
| The Unquowa School | Fairfield | PreK-8 | 142 | 5.3 | Nonsectarian |
| Eagle Hill School | Greenwich | 1-9 | 254 | 4.5 | Nonsectarian |
| Greenwich Academy | Greenwich | PreK-12 | 802 | 7.2 | Nonsectarian, all-girls |
| Greenwich Catholic School | Greenwich | PreK-8 | 294 | 9.5 | Roman Catholic |
| Sacred Heart Greenwich | Greenwich | PreK-12 | 588 | 21.9 | Roman Catholic, all-girls |
| The Greenwich Country Day School | Greenwich | PreK-12 | 1,315 | 7.9 | Nonsectarian |
| Whitby School | Greenwich | PreK-8 | 253 | 3.1 | Nonsectarian |
| New Canaan Country School | New Canaan | PreK-9 | 493 | 8.2 | Nonsectarian |
| Housatonic Valley Waldorf School | Newtown | PreK-7 | 95 | 6.9 | Nonsectarian |
| St. Rose of Lima School | Newtown | PreK-8 | 227 | 18.8 | Roman Catholic |
| Regina Pacis Academy | Norwalk | PreK-8 | 96 | 8.5 | Roman Catholic |
| Winston Preparatory School | Norwalk | 5-12 | 143 | 2.7 | Nonsectarian |
| Ridgefield Montessori School | Ridgefield | PreK-K | 4 | not reported | Nonsectarian |
| St. Mary School | Ridgefield | PreK-8 | 194 | 8.3 | Roman Catholic |
| The Greenwich Japanese School | Riverside | 1-9 | 112 | 5.7 | Nonsectarian |
| The Southport School | Southport | 2-8 | 123 | 3.5 | Nonsectarian |
| Cardinal Kung Academy | Stamford | 7-12 | 117 | 7.5 | Roman Catholic |
| Catholic Academy of Stamford | Stamford | PreK-8 | 255 | 14.2 | Roman Catholic |
| Fusion Academy - Greenwich | Stamford | 6-12 | 35 | 2.3 | Nonsectarian |
| Links Academy | Stamford | 7-12 | 12 | not reported | Nonsectarian |
| Mater Salvatoris College Preparatory School | Stamford | PreK-8 | 200 | 5.7 | Roman Catholic |
| Our Lady of Grace Nursery School & Kindergarten | Stamford | PreK-K | 20 | 6.1 | Roman Catholic |
| The Children's School | Stamford | K-2 | 100 | 8.3 | Nonsectarian |
| The Long Ridge School | Stamford | PreK-5 | 56 | 5.4 | Nonsectarian |
| The Mead School | Stamford | PreK-8 | 80 | 4.1 | Nonsectarian |
| The Pinnacle School | Stamford | 3-12 | 73 | 2.3 | Nonsectarian |
| The Spire School | Stamford | 8-12 | 53 | 3.1 | Nonsectarian |
| Waterside School | Stamford | PreK-5 | 162 | 4.1 | Nonsectarian |
| St. James School | Stratford | PreK-8 | 212 | 11.5 | Roman Catholic |
| Christian Heritage School | Trumbull | K-12 | 407 | 11.6 | Christian (nondenominational) |
| St. Catherine of Siena School | Trumbull | PreK-8 | 195 | 14.6 | Roman Catholic |
| St. Joseph High School | Trumbull | 9-12 | 741 | 14 | Roman Catholic |
| St. Theresa School | Trumbull | PreK-8 | 177 | 12.6 | Roman Catholic |
| Cajal Academy | Westport | 2-12 | 11 | not reported | Nonsectarian |
| Landmark Preschool | Westport | K | 18 | 4 | Nonsectarian |
| Pierrepont School | Westport | K-12 | 114 | 2.6 | Nonsectarian |
| The Learning Community Day School | Westport | PreK-K | 24 | 5 | Nonsectarian |
| Belden Hill Montessori | Wilton | PreK-Transitional K | 4 | 4 | Nonsectarian |
| Westport Day School | Wilton | 6-12 | 27 | 3.4 | Nonsectarian |