| Auburn Adventist Academy | Auburn | 9-12 | 261 | 13.7 | Seventh-Day Adventist |
| Buena Vista SDA School | Auburn | K-8 | 221 | 20.1 | Seventh-Day Adventist |
| Holy Family Catholic School | Auburn | PreK-8 | 173 | 11.8 | Roman Catholic |
| Overcomer Academy | Auburn | PreK-8 | 194 | 15.8 | Christian (nondenominational) |
| Pacific International School; Prek-3rd | Auburn | PreK-3 | 19 | 6.6 | Nonsectarian |
| Rainier Christian Schools-Kent View Elementary | Auburn | K-6 | 105 | 9.2 | Christian (nondenominational) |
| Valley Christian School | Auburn | PreK-6 | 82 | 9.9 | Christian (nondenominational) |
| All-Star Academy | Bellevue | PreK-6 | 5 | 2.5 | Nonsectarian |
| Americas Child Montessori | Bellevue | K-2 | 9 | 9 | Nonsectarian |
| Asia Pacific Language School | Bellevue | PreK-K | 1 | not reported | Nonsectarian |
| Bel-Red Bilingual Academy | Bellevue | PreK-2 | 60 | 3.9 | Nonsectarian |
| Bellevue Children's Academy | Bellevue | PreK-4 | 541 | 8 | Nonsectarian |
| Bellevue Montessori School | Bellevue | 1-6 | 255 | 15.4 | Nonsectarian |
| Cedar Crest Academy Bellewood | Bellevue | PreK-5 | 190 | 12.7 | Nonsectarian |
| Cedar Crest Academy, Park Hig | Bellevue | PreK-K | 13 | not reported | Nonsectarian |
| Chestnut Montessori School | Bellevue | PreK-K | 2 | not reported | Nonsectarian |
| Dartmoor School | Bellevue | 3-12 | 78 | 4.9 | Nonsectarian |
| Dartmoor School - Seattle | Bellevue | 4-12 | 49 | 2 | Nonsectarian |
| Dartmoor School--Bellevue | Bellevue | 1-12 | 62 | 3.1 | Nonsectarian |
| Eastside Academy | Bellevue | 9-12 | 14 | 3.3 | Christian (nondenominational) |
| Eastside Christian School | Bellevue | PreK-8 | 239 | 9.6 | Christian (nondenominational) |
| Eton School | Bellevue | PreK-8 | 227 | 7.7 | Nonsectarian |
| Forest Ridge School of the Sacred Heart | Bellevue | 5-12 | 245 | 6.6 | Roman Catholic, all-girls |
| French Immersion School of Washington | Bellevue | PreK-5 | 149 | 9.3 | Nonsectarian |
| Intl Friends School | Bellevue | PreK-3 | 44 | 8.8 | Friends |
| Jewish Day School of Metropolitan Seattle | Bellevue | PreK-8 | 77 | 5.2 | Jewish |
| Living Montessori Academy | Bellevue | PreK-3 | 20 | 10 | Nonsectarian |
| Medina Academy | Bellevue | PreK-8 | 229 | 11.2 | Islamic |
| Newport Children's School | Bellevue | PreK-K | 33 | 11 | Nonsectarian |
| Open Window School | Bellevue | K-8 | 359 | 10.6 | Nonsectarian |
| Overlake Specialty School | Bellevue | 2-12 | 59 | 8.4 | Nonsectarian |
| Pikake School | Bellevue | PreK-K | 6 | 6 | Nonsectarian |
| Seattle Voctech School | Bellevue | 6-11 | 10 | 2.2 | Nonsectarian |
| Solomon International School | Bellevue | 8-12 | 14 | 14 | Nonsectarian |
| St. Madeleine Sophie Catholic School | Bellevue | PreK-8 | 144 | 9 | Roman Catholic |
| Summit Classical Christian School | Bellevue | K-12 | 275 | 7.4 | Christian (nondenominational) |
| The Little School | Bellevue | PreK-5 | 165 | 9.2 | Nonsectarian |
| Tzu Chi Academy Seattle | Bellevue | PreK-10 | 282 | 14.9 | Nonsectarian |
| Dartmoor Schools | Bothell | 3-12 | 36 | 5.5 | Nonsectarian |
| Evergreen Academy | Bothell | PreK-5 | 171 | 5.2 | Nonsectarian |
| Heritage Christian Academy | Bothell | PreK-10 | 253 | 7.6 | Baptist |
| Providence Classical Christian School | Bothell | PreK-12 | 350 | 12.7 | Calvinist |
| St. Brendan's Catholic Church | Bothell | PreK-8 | 217 | 18.1 | Roman Catholic |
| Woodinville Montessori School | Bothell | PreK-12 | 312 | 7.7 | Nonsectarian |
| Glendale Lutheran School | Burien | PreK-8 | 63 | 11.2 | Evangelical Lutheran Church in America |
| John F Kennedy Catholic High School | Burien | 9-12 | 815 | 12.6 | Roman Catholic |
| Mayf Academy | Burien | K-7 | 180 | 22.5 | Islamic |
| St. Bernadette School | Burien | PreK-8 | 168 | 14 | Roman Catholic |
| The Bridge School | Burien | K-5 | 34 | 9.7 | Nonsectarian |
| Three Tree Montessori School | Burien | PreK-6 | 73 | 10.4 | Nonsectarian |
| Sacred Heart School | Clyde Hill | PreK-8 | 408 | 13.2 | Roman Catholic |
| Holy Trinity Lutheran School | Des Moines | PreK-8 | 186 | 16.5 | Wisconsin Evangelical Lutheran Synod |
| K-School | Des Moines | 1-12 | 38 | 10.9 | Wisconsin Evangelical Lutheran Synod |
| St. Philomena School | Des Moines | PreK-8 | 261 | 17.9 | Roman Catholic |
| Hillside Academy | Duvall | PreK-8 | 39 | 3.8 | Christian (nondenominational) |
| A Country Garden Montessori | Enumclaw | PreK-K | 2 | not reported | Nonsectarian |
| Rainier Foothills Academy | Enumclaw | K-2 | 9 | 9 | Nonsectarian |
| Brooklake Christian School | Federal Way | PreK-5 | 98 | 11 | Assembly of God |
| Evergreen Christian Private School | Federal Way | K-8 | 201 | 13.8 | Christian (nondenominational) |
| Holy Innocents School of the Northwest | Federal Way | K-8 | 26 | 8.7 | Roman Catholic |
| Montessori Academy at Spring Valley | Federal Way | PreK-8 | 44 | 13.3 | Nonsectarian |
| St. Vincent de Paul School | Federal Way | PreK-8 | 232 | 13.6 | Roman Catholic |
| Bright Horizons at the Highlands | Issaquah | PreK-5 | 6 | 6 | Nonsectarian |
| Brightmont Academy - Sammamish | Issaquah | 1-12 | 44 | 2.5 | Nonsectarian |
| Emerald Heights Academy | Issaquah | PreK-8 | 45 | 7.4 | Roman Catholic |
| Gilman Montessori Academy | Issaquah | PreK | 4 | not reported | Nonsectarian |
| Issaquah Montessori School | Issaquah | PreK-K | 10 | 2.6 | Nonsectarian |
| Lakeside Montessori School | Issaquah | PreK-K | 2 | not reported | Nonsectarian |
| Snoqualmie Springs School | Issaquah | PreK-2 | 71 | 16.1 | Nonsectarian |
| St. Joseph School-- Issaquah and Snoqualmie | Issaquah | PreK-7 | 165 | 6.2 | Roman Catholic |
| Synergy Learning Academy | Issaquah | PreK-Transitional K | 9 | not reported | Nonsectarian |
| Basic Steps Academy | Kent | K-1 | 6 | 3.2 | Nonsectarian |
| Cascade Vista Baptist School | Kent | PreK-12 | 123 | 11.4 | Baptist |
| Sunbeams Lutheran School | Kent | PreK-5 | 54 | 13.2 | Lutheran Church (Missouri Synod) |
| Sunshine Mountain Christian School | Kent | PreK-K | 24 | 12 | Lutheran |
| Avocado Montessori Academy Bld | Kirkland | PreK | 50 | 3.2 | Nonsectarian |
| Cedar Crest Academy Kirkland | Kirkland | PreK-K | 24 | 10 | Nonsectarian |
| Countryside Montessori | Kirkland | PreK-K | 4 | 2 | Nonsectarian |
| Creative Sprouts | Kirkland | PreK-Transitional K | 2 | not reported | Nonsectarian |
| Eastside Preparatory School | Kirkland | 5-12 | 536 | 8.7 | Nonsectarian |
| Holy Family Parish School | Kirkland | PreK-8 | 260 | 14 | Roman Catholic |
| Kirkland Childrens School | Kirkland | PreK-4 | 32 | 10.7 | Nonsectarian |
| Lakeview Montessori School | Kirkland | PreK-K | 6 | 3 | Nonsectarian |
| Les Lilas French Bilingual Community School | Kirkland | PreK-3 | 52 | 4.2 | Nonsectarian |
| Northlake Academy | Kirkland | PreK-5 | 108 | 3.7 | Nonsectarian |
| Puget Sound Adventist Academy | Kirkland | K-12 | 187 | 12.1 | Seventh-Day Adventist |
| Creative Learning Center | Mercer Island | PreK-K | 4 | not reported | Nonsectarian |
| Early World Montessori | Mercer Island | PreK-K | 6 | 3 | Nonsectarian |
| French American School of Puget Sound | Mercer Island | PreK-8 | 312 | 5.3 | Nonsectarian |
| Northwest Yeshiva High School | Mercer Island | 9-12 | 57 | 4.3 | Jewish |
| Privett Academy | Mercer Island | 7-12 | 74 | 10.6 | Nonsectarian |
| St. Monica School | Mercer Island | PreK-12 | 222 | 9.7 | Roman Catholic |
| Yellow Wood Academy | Mercer Island | 4-12 | 101 | not reported | Nonsectarian |
| New Life Montessori | Newcastle | PreK-K | 3 | not reported | Christian (nondenominational) |
| Brightmont Academy-Redmond | Redmond | 3-12 | 26 | not reported | Nonsectarian |
| Cascadia School | Redmond | PreK-5 | 97 | 9.6 | Nonsectarian |
| Cedar Crest Academy | Redmond | PreK-K | 30 | 12.5 | Nonsectarian |
| Eaton Arrowsmith School | Redmond | Ungraded | 18 | 3.7 | Nonsectarian |
| Global Idea School | Redmond | K-4 | 42 | 5.2 | Nonsectarian |
| Montessori Childrens House | Redmond | PreK-8 | 79 | 4.4 | Nonsectarian |
| Northern Lights Montessori | Redmond | PreK-1 | 25 | 12.5 | Nonsectarian |
| Northern Lights Montessori - Willows Campus | Redmond | PreK-1 | 25 | 6.2 | Nonsectarian |
| Spectrum Academy | Redmond | PreK-Transitional K | 13 | not reported | Nonsectarian |
| The Bear Creek School | Redmond | PreK-12 | 673 | 8.3 | Christian (nondenominational) |
| The Madrone School | Redmond | Ungraded | 8 | 7.3 | Nonsectarian |
| The Sammamish Montessori School | Redmond | PreK-K | 50 | not reported | Nonsectarian |
| Willows Preparatory School | Redmond | 5-12 | 271 | 8.7 | Nonsectarian |
| Cedar River Montessori School | Renton | PreK-8 | 79 | 5.5 | Nonsectarian |
| Children's Institute for Learning Differences | Renton | 1-12 | 41 | 4.1 | Nonsectarian |
| King of Kings Lutheran Preschool and Kindergarten | Renton | PreK-Transitional K | 5 | 8.3 | Lutheran Church (Missouri Synod) |
| Maple Valley Elementary School | Renton | PreK-6 | 53 | not reported | Christian (nondenominational) |
| New Horizon School | Renton | 5-12 | 49 | 6.1 | Nonsectarian |
| Phoenix Montessori | Renton | PreK-K | 5 | not reported | Nonsectarian |
| Rainier Christian School District | Renton | PreK-12 | 274 | 7.7 | Christian (nondenominational) |
| Renton Christian School | Renton | PreK-8 | 690 | 15.9 | Assembly of God |
| Renton Prep Christian School | Renton | PreK-10 | 220 | 13.3 | Lutheran Church (Missouri Synod) |
| St. Anthony Elementary School | Renton | PreK-8 | 350 | 17.5 | Roman Catholic |
| Arbor Schools | Sammamish | PreK-5 | 44 | 4.9 | Nonsectarian |
| Aster Montessori School | Sammamish | PreK-K | 4 | not reported | Nonsectarian |
| Eastside Montessori Education Family | Sammamish | PreK-5 | 54 | 2.2 | Nonsectarian |
| Pacific Learning Academy | Sammamish | 6-12 | 37 | 5.4 | Nonsectarian |
| Sammamish Childrens School | Sammamish | PreK-K | 23 | 11.5 | Nonsectarian |
| TLC Montessori | Sammamish | PreK-1 | 12 | 5.7 | Nonsectarian |
| St. Francis of Assisi School | Seahurst | K-8 | 479 | 17.2 | Roman Catholic |
| Hope Christian Academy | Seatac | K-10 | 14 | 3 | Assembly of God |
| Seattle Christian Schools | Seatac | K-12 | 606 | 12.9 | Christian (nondenominational) |
| Academy for Precision Learning | Seattle | K-12 | 66 | 4 | Nonsectarian |
| Academy for Precision Learning, Upper School | Seattle | K-12 | 67 | 4.1 | Nonsectarian |
| Bertschi School | Seattle | PreK-5 | 226 | 10.3 | Nonsectarian |
| Billings Middle School | Seattle | 6-8 | 82 | 7.4 | Nonsectarian |
| Bishop Blanchet High School | Seattle | 9-12 | 922 | 13 | Roman Catholic |
| Bridges Academy Seattle | Seattle | 4-12 | 43 | 2.6 | Nonsectarian |
| Bright Water Waldorf School | Seattle | PreK-8 | 56 | 5.5 | Nonsectarian |
| Christ the King Parish School | Seattle | PreK-8 | 157 | 14.4 | Roman Catholic |
| Concordia Lutheran School | Seattle | PreK-7 | 58 | 7 | Lutheran Church (Missouri Synod) |
| Derech Emunah | Seattle | 9-11 | 6 | not reported | Jewish, all-girls |
| Discovery Montessori School | Seattle | PreK-K | 5 | 5 | Nonsectarian |
| Epiphany School | Seattle | PreK-5 | 232 | 7.2 | Nonsectarian |
| Explorer West Middle School | Seattle | 6-8 | 106 | 9.1 | Nonsectarian |
| Fusion Academy Seattle | Seattle | 6-12 | 39 | 2.3 | Nonsectarian |
| Hamlin Robinson School | Seattle | 1-8 | 389 | 7.1 | Nonsectarian |
| Hampton Tutors | Seattle | 12 | 1 | not reported | Nonsectarian |
| Holy Names Academy | Seattle | 9-12 | 571 | 16.2 | Roman Catholic, all-girls |
| Holy Rosary School | Seattle | PreK-8 | 465 | 16.1 | Roman Catholic |
| Hope Lutheran School | Seattle | PreK-8 | 135 | 9.4 | Lutheran Church (Missouri Synod) |
| Ideal School | Seattle | K-9 | 116 | 9.7 | Nonsectarian |
| Kaleidoscope School | Seattle | K-3 | 8 | 4 | Nonsectarian |
| Kapka Cooperative School | Seattle | K-5 | 66 | 7.9 | Nonsectarian |
| King's School | Seattle | PreK-12 | 1,209 | 14.2 | Christian (nondenominational) |
| Lake Washington Girls Middle School | Seattle | 6-8 | 111 | 7.4 | Nonsectarian, all-girls |