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Among "All Schools," view the twenty boarding schools with the "smallest average class sizes." First, some important notes:
- Keep in mind that small statistical differences in average class sizes between schools do not always indicate better student performance at one school or another.
- Also keep in mind that boarding schools in general have smaller average class sizes than public schools - even for schools with larger class sizes, a "large" class in a boarding school would still often be considered small by public school standards which often have class sizes of 20+ students.
| Sorted by range (alphabetically within range) | * Indicates Boarding Grades Offered | ||
|
Boarding
School
|
School Type
|
Grades*
|
# Students
|
| 1. The Oxford Academy | All-Boys | 9-12, PG | 1 |
| 2. Brandon Hall School | Co-Ed | 4-12, PG | 4 |
| 3. The Gow School | All-Boys | 7-12, PG | 5 |
| 4. The Winchendon School | Co-Ed | 8-12, PG | 6 |
| 5.-8. Grand River Academy | All-Boys | 9-12, PG | 7 |
| 5.-8. Nawa Academy | Co-Ed | 7-12 | 7 |
| 5.-8. The Phelps School | All-Boys | 7-12, PG | 7 |
| 5.-8. Pine Ridge School | Co-Ed | 7-12, PG | 7 |
| 9.-19. Academy of the Holy Family | All-Girls | 9-12, PG | 8 |
| 9.-19. Hoosac School | Co-Ed | 8-12, PG | 8 |
| 9.-19. Howe Military School & Summer Camp | Co-Ed | 5-12 | 8 |
| 9.-19. Landmark School | Co-Ed | 9-12 | 8 |
| 9.-19. The Leelanau School | Co-Ed | 9-12 | 8 |
| 9.-19. Linden Hall | All-Girls | 6-12, PG | 8 |
| 9.-19. Lowell Whiteman School | Co-Ed | 9-12 | 8 |
| 9.-19. The Marvelwood School | Co-Ed | 9-12, PG | 8 |
| 9.-19. Oliverian School | Co-Ed | 8-12 | 8 |
| 9.-19. The Outdoor Academy | Co-Ed | 10-11 | 8 |
| 9.-19. West Nottingham Academy | Co-Ed | 9-12, PG | 8 |
| 20.-29. Blue Ridge School | All-Boys | 9-12 | 9 |
| Sorted by range (alphabetically within range) | * Indicates Boarding Grades Offered | ||
|
Boarding
School
|
School Type
|
Grades*
|
# Students
|
| 20.-29. Buxton School | Co-Ed | 9-12 | 9 |
| 20.-29. Chatham Hall | All-Girls | 9-12 | 9 |
| 20.-29. Darrow School | Co-Ed | 9-12 | 9 |
| 20.-29. Grier School | All-Girls | 7-12, PG | 9 |
| 20.-29. Northwood School | Co-Ed | 9-12, PG | 9 |
| 20.-29. Squaw Valley Academy | Co-Ed | 6-12 | 9 |
| 20.-29. The Storm King School | Co-Ed | 9-12 | 9 |
| 20.-29. The Thacher School | Co-Ed | 9-12 | 9 |
| 20.-29. White Mountain School | Co-Ed | 9-12, PG | 9 |
| 30.-60. Andrews Osborne Academy | Co-Ed | 7-12 | 10 |
| 30.-60. Annie Wright School | All-Girls | 9-12 | 10 |
| 30.-60. Besant Hill School (Formerly Happy Valley School) | Co-Ed | 9-12 | 10 |
| 30.-60. Blair Academy | Co-Ed | 9-12, PG | 10 |
| 30.-60. Bridgton Academy | All-Boys | 12-12, PG | 10 |
| 30.-60. Cate School | Co-Ed | 9-12 | 10 |
| 30.-60. CFS, The School at Church Farm | All-Boys | 7-12 | 10 |
| 30.-60. Chapel Hill-Chauncy Hall | Co-Ed | 9-12, PG | 10 |
| 30.-60. Colorado Rocky Mountain School | Co-Ed | 9-12 | 10 |
| 30.-60. Country Day School, Costa Rica | Co-Ed | 8-12 | 10 |
| 30.-60. Dublin School | Co-Ed | 9-12, PG | 10 |
| 30.-60. Fishburne Military School | All-Boys | 8-12 | 10 |
| 30.-60. Foxcroft School | All-Girls | 9-12 | 10 |
| 30.-60. The Kiski School | All-Boys | 9-12, PG | 10 |
| 30.-60. The Knox School | Co-Ed | 7-12 | 10 |
| 30.-60. Maharishi Academy of Total Knowledge | All-Boys | 9-12 | 10 |
| 30.-60. Olney Friends School | Co-Ed | 9-12 | 10 |
| 30.-60. Purnell School | All-Girls | 9-12 | 10 |
| 30.-60. Riverside Military Academy | All-Boys | 7-12 | 10 |
| 30.-60. St. George's School | Co-Ed | 9-12 | 10 |
| 30.-60. St. Paul's School | Co-Ed | 9-12 | 10 |
| 30.-60. St. Timothy's School | All-Girls | 9-12, PG | 10 |
| 30.-60. Salem Academy | All-Girls | 9-12 | 10 |
| 30.-60. Scattergood Friends School | Co-Ed | 9-12, PG | 10 |
| 30.-60. Sedbergh School | Co-Ed | 7-12 | 10 |
| 30.-60. South Kent School | All-Boys | 9-12, PG | 10 |
| 30.-60. Stoneleigh-Burnham School | All-Girls | 7-12, PG | 10 |
| 30.-60. Stuart Hall School | All-Girls | 8-12 | 10 |
| 30.-60. Suffield Academy | Co-Ed | 9-12, PG | 10 |
| 30.-60. Wasatch Academy | Co-Ed | 9-12, PG | 10 |
| 30.-60. Woodberry Forest School | All-Boys | 9-12 | 10 |
| 61.-84. Brenau Academy | All-Girls | 9-12, PG | 11 |
| 61.-84. The Cambridge School of Weston | Co-Ed | 9-12, PG | 11 |
| 61.-84. Christ School | All-Boys | 8-12 | 11 |
| 61.-84. Emma Willard School | All-Girls | 9-12, PG | 11 |
| 61.-84. Hargrave Military Academy | All-Boys | 7-12, PG | 11 |
| 61.-84. Hawaii Preparatory Academy | Co-Ed | 6-12, PG | 11 |
| 61.-84. Kents Hill School | Co-Ed | 9-12, PG | 11 |
| 61.-84. The MacDuffie School | Co-Ed | 9-12 | 11 |
| 61.-84. Middlesex School | Co-Ed | 9-12 | 11 |
| 61.-84. Miss Hall's School | All-Girls | 9-12 | 11 |
| 61.-84. Miss Porter's School | All-Girls | 9-12, PG | 11 |
| 61.-84. Missouri Military Academy | All-Boys | 6-12, PG | 11 |
| 61.-84. Oakdale Christian Academy | Co-Ed | 7-12 | 11 |
| 61.-84. Pomfret School | Co-Ed | 9-12, PG | 11 |
| 61.-84. St. Andrew's School, DE | Co-Ed | 9-12 | 11 |
| 61.-84. St. John's Northwestern Military Academy | All-Boys | 7-12 | 11 |
| 61.-84. St. Margaret's School | All-Girls | 8-12 | 11 |
| 61.-84. St. Mark's School | Co-Ed | 9-12 | 11 |
| 61.-84. Solebury School | Co-Ed | 9-12, PG | 11 |
| 61.-84. Tallulah Falls School | Co-Ed | 7-12 | 11 |
| 61.-84. Verde Valley School | Co-Ed | 9-12 | 11 |
| 61.-84. Vermont Academy | Co-Ed | 9-12, PG | 11 |
| 61.-84. Wentworth Military Academy & College | Co-Ed | 9-12, PG | 11 |
| 61.-84. Westover School | All-Girls | 9-12 | 11 |
| 85.-147. Avon Old Farms School | All-Boys | 9-12, PG | 12 |
| 85.-147. Berkshire School | Co-Ed | 9-12, PG | 12 |
| 85.-147. Brewster Academy | Co-Ed | 9-12, PG | 12 |
| 85.-147. Brooks School | Co-Ed | 9-12 | 12 |
| 85.-147. Camden Military Academy | All-Boys | 7-12, PG | 12 |
| 85.-147. Canterbury School | Co-Ed | 9-12, PG | 12 |
| 85.-147. Cheshire Academy | Co-Ed | 9-12, PG | 12 |
| 85.-147. Choate Rosemary Hall | Co-Ed | 9-12, PG | 12 |
| 85.-147. Christchurch School | All-Boys | 8-12, PG | 12 |
| 85.-147. Concord Academy | Co-Ed | 9-12 | 12 |
| 85.-147. Cushing Academy | Co-Ed | 9-12, PG | 12 |
| 85.-147. Dana Hall School | All-Girls | 9-12 | 12 |
| 85.-147. Deerfield Academy | Co-Ed | 9-12, PG | 12 |
| 85.-147. Episcopal High School | Co-Ed | 9-12 | 12 |
| 85.-147. The Ethel Walker School | All-Girls | 9-12 | 12 |
| 85.-147. The Forman School | Co-Ed | 9-12, PG | 12 |
| 85.-147. Fountain Valley School of Colorado | Co-Ed | 9-12 | 12 |
| 85.-147. The Glenholme School | Co-Ed | 5-12, PG | 12 |
| 85.-147. Gould Academy | Co-Ed | 9-12, PG | 12 |
| 85.-147. The Governor's Academy (formerly Governor Dummer Academy) | Co-Ed | 9-12 | 12 |
| 85.-147. The Gunnery | Co-Ed | 9-12, PG | 12 |
| 85.-147. Hebron Academy | Co-Ed | 9-12, PG | 12 |
| 85.-147. High Mowing School | Co-Ed | 9-12 | 12 |
| 85.-147. Hill School | Co-Ed | 9-12, PG | 12 |
| 85.-147. The Hotchkiss School | Co-Ed | 9-12, PG | 12 |
| 85.-147. Hyde-Bath | Co-Ed | 9-12, PG | 12 |
| 85.-147. Hyde-Woodstock | Co-Ed | 9-12, PG | 12 |
| 85.-147. Kent School | Co-Ed | 9-12, PG | 12 |
| 85.-147. Kimball Union Academy | Co-Ed | 9-12, PG | 12 |
| 85.-147. La Lumiere School | Co-Ed | 9-12, PG | 12 |
| 85.-147. Lake Forest Academy | Co-Ed | 9-12, PG | 12 |
| 85.-147. Lawrenceville School | Co-Ed | 9-12, PG | 12 |
| 85.-147. The Madeira School | All-Girls | 9-12 | 12 |
| 85.-147. Massanutten Military Academy | Co-Ed | 7-12, PG | 12 |
| 85.-147. Mercersburg Academy | Co-Ed | 9-12, PG | 12 |
| 85.-147. Midland School | Co-Ed | 9-12 | 12 |
| 85.-147. Miller School | Co-Ed | 8-12, PG | 12 |
| 85.-147. New Hampton School | Co-Ed | 9-12, PG | 12 |
| 85.-147. New York Military Academy | Co-Ed | 7-12 | 12 |
| 85.-147. Peddie School | Co-Ed | 9-12, PG | 12 |
| 85.-147. Perkiomen School | Co-Ed | 7-12, PG | 12 |
| 85.-147. Phillips Exeter Academy | Co-Ed | 9-12, PG | 12 |
| 85.-147. Proctor Academy | Co-Ed | 9-12 | 12 |
| 85.-147. St. Andrew's School - RI | Co-Ed | 9-12 | 12 |
| 85.-147. St. Anne's-Belfield School | Co-Ed | 9-12 | 12 |
| 85.-147. Saint James School | Co-Ed | 8-12 | 12 |
| 85.-147. St. Johnsbury Academy | Co-Ed | 9-12, PG | 12 |
| 85.-147. Salisbury School | All-Boys | 9-12, PG | 12 |
| 85.-147. San Domenico School | All-Girls | 9-12 | 12 |
| 85.-147. San Marcos Baptist Academy | Co-Ed | 7-12 | 12 |
| 85.-147. Santa Catalina School | All-Girls | 9-12 | 12 |
| 85.-147. Stanstead College | Co-Ed | 7-12 | 12 |
| 85.-147. Subiaco Academy | All-Boys | 9-12 | 12 |
| 85.-147. Tabor Academy | Co-Ed | 9-12 | 12 |
| 85.-147. Thomas Jefferson School | Co-Ed | 7-12, PG | 12 |
| 85.-147. Tilton School | Co-Ed | 9-12, PG | 12 |
| 85.-147. TMI -The Episcopal School of Texas | Co-Ed | 9-12 | 12 |
| 85.-147. Virginia Episcopal School | Co-Ed | 9-12 | 12 |
| 85.-147. Wayland Academy | Co-Ed | 9-12 | 12 |
| 85.-147. The Webb School | Co-Ed | 7-12, PG | 12 |
| 85.-147. Western Reserve Academy | Co-Ed | 9-12, PG | 12 |
| 85.-147. Westminster School | Co-Ed | 9-12, PG | 12 |
| 85.-147. Wilbraham & Monson Academy | Co-Ed | 9-12, PG | 12 |
| 148.-157. Groton School | Co-Ed | 8-12 | 13 |
| 148.-157. Holderness School | Co-Ed | 9-12, PG | 13 |
| 148.-157. The Hun School of Princeton | Co-Ed | 9-12, PG | 13 |
| 148.-157. Leysin American School in Switzerland | Co-Ed | 9-12, PG | 13 |
| 148.-157. Northfield Mount Hermon School | Co-Ed | 9-12, PG | 13 |
| 148.-157. The Pennington School | Co-Ed | 7-12 | 13 |
| 148.-157. Phillips Academy Andover | Co-Ed | 9-12, PG | 13 |
| 148.-157. Saint Mary's School | All-Girls | 9-12 | 13 |
| 148.-157. Trinity Pawling School | All-Boys | 9-12, PG | 13 |
| 148.-157. The Williston Northampton School | Co-Ed | 9-12, PG | 13 |
| 158.-181. Advanced Academy of Georgia | Co-Ed | 11-12 | 14 |
| 158.-181. Army and Navy Academy | All-Boys | 7-12 | 14 |
| 158.-181. Asheville School | Co-Ed | 9-12 | 14 |
| 158.-181. Baylor School | Co-Ed | 9-12 | 14 |
| 158.-181. Carlisle School | Co-Ed | 9-12 | 14 |
| 158.-181. Darlington School | Co-Ed | 9-12, PG | 14 |
| 158.-181. Dunn School | Co-Ed | 9-12 | 14 |
| 158.-181. George School | Co-Ed | 9-12 | 14 |
| 158.-181. Idyllwild Arts Academy | Co-Ed | 9-12, PG | 14 |
| 158.-181. Lawrence Academy | Co-Ed | 9-12 | 14 |
| 158.-181. Loomis Chaffee School | Co-Ed | 9-12, PG | 14 |
| 158.-181. The Masters School | Co-Ed | 9-12 | 14 |
| 158.-181. McCallie School | All-Boys | 9-12 | 14 |
| 158.-181. Millbrook School | Co-Ed | 9-12 | 14 |
| 158.-181. Milton Academy | Co-Ed | 9-12 | 14 |
| 158.-181. Oldfields School | All-Girls | 8-12, PG | 14 |
| 158.-181. Oregon Episcopal School | Co-Ed | 9-12 | 14 |
| 158.-181. Orme School | Co-Ed | 8-12, PG | 14 |
| 158.-181. Portsmouth Abbey School | Co-Ed | 9-12 | 14 |
| 158.-181. Rosseau Lake College | Co-Ed | 7-12 | 14 |
| 158.-181. St. Andrew's-Sewanee School | Co-Ed | 9-12 | 14 |
| 158.-181. Stevenson School | Co-Ed | 9-12 | 14 |
| 158.-181. The Stony Brook School | Co-Ed | 7-12 | 14 |
| 158.-181. Wyoming Seminary Upper School | Co-Ed | 9-12, PG | 14 |
| 182.-203. The Athenian School | Co-Ed | 9-12 | 15 |
| 182.-203. The Bolles School | Co-Ed | 7-12, PG | 15 |
| 182.-203. Bronte College of Canada | Co-Ed | 9-12, PG | 15 |
| 182.-203. CCI The Renaissance School | Co-Ed | 10-12, PG | 15 |
| 182.-203. Conserve School | Co-Ed | 9-12 | 15 |
| 182.-203. EduKick Academic Soccer Boarding School Academies | Co-Ed | 8-12, PG | 15 |
| 182.-203. Florida Air Academy | Co-Ed | 6-12 | 15 |
| 182.-203. Fork Union Military Academy | All-Boys | 6-12, PG | 15 |
| 182.-203. Fryeburg Academy | Co-Ed | 9-12, PG | 15 |
| 182.-203. Garrison Forest School | All-Girls | 8-12 | 15 |
| 182.-203. George Stevens Academy | Co-Ed | 9-12 | 15 |
| 182.-203. The Hockaday School | All-Girls | 8-12 | 15 |
| 182.-203. Interlochen Arts Academy | Co-Ed | 9-12, PG | 15 |
| 182.-203. New Mexico Military Institute | Co-Ed | 9-12, PG | 15 |
| 182.-203. Oakwood Friends School | Co-Ed | 9-12 | 15 |
| 182.-203. The Putney School | Co-Ed | 9-12 | 15 |
| 182.-203. Randolph-Macon Academy | Co-Ed | 6-12, PG | 15 |
| 182.-203. Saint Andrew's School | Co-Ed | 9-12 | 15 |
| 182.-203. St. Thomas More School | All-Boys | 8-12, PG | 15 |
| 182.-203. Shawnigan Lake School | Co-Ed | 8-12 | 15 |
| 182.-203. TASIS The American School in England | Co-Ed | 9-12, PG | 15 |
| 182.-203. Westtown School | Co-Ed | 9-12 | 15 |
| 204.-231. Admiral Farragut Academy | Co-Ed | 6-12 | >15 |
| 204.-231. Cranbrook Schools | Co-Ed | 9-12 | >15 |
| 204.-231. Culver Academies | Co-Ed | 9-12, PG | >15 |
| 204.-231. Family First Academy | Co-Ed | 8-12 | >15 |
| 204.-231. Georgetown Preparatory School | All-Boys | 9-12 | >15 |
| 204.-231. Indian Springs School | Co-Ed | 9-12 | >15 |
| 204.-231. Ojai Valley School | Co-Ed | 3-12 | >15 |
| 204.-231. Rabun Gap-Nacoochee School | Co-Ed | 7-12 | >15 |
| 204.-231. St. Catherine's Military Academy | All-Boys | 4-8 | >15 |
| 204.-231. Saint John's Preparatory School | Co-Ed | 9-12, PG | >15 |
| 204.-231. St. Stephen's Episcopal School | Co-Ed | 8-12 | >15 |
| 204.-231. Shattuck-St. Mary's School | Co-Ed | 6-12, PG | >15 |
| 204.-231. The Webb Schools | Co-Ed | 9-12 | >15 |
| 204.-231. Brentwood College School | Co-Ed | 9-12 | >15 |
| 204.-231. The Delphian School | Co-Ed | 3-12 | >15 |
| 204.-231. Ridley College | Co-Ed | 5-12, PG | >15 |
| 204.-231. St. Andrew's College | All-Boys | 6-12, PG | >15 |
| 204.-231. Villanova Preparatory School | Co-Ed | 9-12 | >15 |
| 204.-231. The Brook Hill School | Co-Ed | 8-12 | >15 |
| 204.-231. Flintridge Sacred Heart Academy | All-Girls | 9-12 | >15 |
| 204.-231. Havergal College | All-Girls | 9-12 | >15 |
| 204.-231. The King's Academy | Co-Ed | 7-12 | >15 |
| 204.-231. Montverde Academy | Co-Ed | 7-12, PG | >15 |
| 204.-231. St. Michaels University School | Co-Ed | 8-12 | >15 |
| 204.-231. The Bishop Strachan School | All-Girls | 7-12 | >15 |
| 204.-231. Cotter Schools | Co-Ed | 9-12, PG | >15 |
| 204.-231. Monte Vista Christian School | Co-Ed | 9-12 | >15 |
| 204.-231. Girard College | Co-Ed | 1-12 | >15 |
• View all schools sorted by "average class size"
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