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.-18.  Academy of the Holy Family	All-Girls	9-12, PG	8
9.-18. Hoosac School	Co-Ed	8-12, PG	8
9.-18. Howe Military School & Summer Camp	Co-Ed	5-12	8
9.-18. Landmark School	Co-Ed	9-12	8
9.-18. The Leelanau School	Co-Ed	9-12	8
9.-18. Linden Hall	All-Girls	6-12, PG	8
9.-18. The Marvelwood School	Co-Ed	9-12, PG	8
9.-18. Oliverian School	Co-Ed	8-12	8
9.-18. The Outdoor Academy	Co-Ed	10-11	8
9.-18. Squaw Valley Academy	Co-Ed	6-12	8
19.-27. Blue Ridge School	All-Boys	9-12	9
19.-27. Buxton School	Co-Ed	9-12	9

Sorted by range (alphabetically within range)		* Indicates Boarding Grades Offered
Boarding School	School Type	Grades*	# Students
19.-27. Chatham Hall	All-Girls	9-12	9
19.-27. Darrow School	Co-Ed	9-12	9
19.-27. Grier School	All-Girls	7-12, PG	9
19.-27. Northwood School	Co-Ed	9-12, PG	9
19.-27. The Storm King School	Co-Ed	9-12	9
19.-27. The Thacher School	Co-Ed	9-12	9
19.-27. White Mountain School	Co-Ed	9-12, PG	9
28.-59. Andrews Osborne Academy	Co-Ed	7-12	10
28.-59. Annie Wright School	All-Girls	9-12, PG	10
28.-59. Besant Hill School (Formerly Happy Valley School)	Co-Ed	9-12	10
28.-59. Blair Academy	Co-Ed	9-12, PG	10
28.-59. Bridgton Academy	All-Boys	12-12, PG	10
28.-59. Cate School	Co-Ed	9-12	10
28.-59. CFS, The School at Church Farm	All-Boys	7-12	10
28.-59. Chapel Hill-Chauncy Hall	Co-Ed	9-12, PG	10
28.-59. Colorado Rocky Mountain School	Co-Ed	9-12	10
28.-59. Country Day School, Costa Rica	Co-Ed	8-12	10
28.-59. Dublin School	Co-Ed	9-12, PG	10
28.-59. Fishburne Military School	All-Boys	8-12	10
28.-59. Foxcroft School	All-Girls	9-12	10
28.-59. The Kiski School	All-Boys	9-12, PG	10
28.-59. The Knox School	Co-Ed	7-12	10
28.-59. Maharishi Academy of Total Knowledge	All-Boys	9-12	10
28.-59. Olney Friends School	Co-Ed	9-12	10
28.-59. Purnell School	All-Girls	9-12	10
28.-59. Riverside Military Academy	All-Boys	7-12	10
28.-59. St. George's School	Co-Ed	9-12	10
28.-59. St. Paul's School	Co-Ed	9-12	10
28.-59. St. Timothy's School	All-Girls	9-12, PG	10
28.-59. Salem Academy	All-Girls	9-12	10
28.-59. Scattergood Friends School	Co-Ed	9-12, PG	10
28.-59. Sedbergh School	Co-Ed	7-12	10
28.-59. South Kent School	All-Boys	9-12, PG	10
28.-59. Stoneleigh-Burnham School	All-Girls	7-12, PG	10
28.-59. Stuart Hall School	All-Girls	8-12	10
28.-59. Suffield Academy	Co-Ed	9-12, PG	10
28.-59. Wasatch Academy	Co-Ed	9-12, PG	10
28.-59. West Nottingham Academy	Co-Ed	9-12, PG	10
28.-59. Woodberry Forest School	All-Boys	9-12	10
60.-84. Brenau Academy	All-Girls	9-12, PG	11
60.-84. The Cambridge School of Weston	Co-Ed	9-12, PG	11
60.-84. Christ School	All-Boys	8-12	11
60.-84. Emma Willard School	All-Girls	9-12, PG	11
60.-84. Hargrave Military Academy	All-Boys	7-12, PG	11
60.-84. Hawaii Preparatory Academy	Co-Ed	6-12, PG	11
60.-84. Kents Hill School	Co-Ed	9-12, PG	11
60.-84. The MacDuffie School	Co-Ed	9-12	11
60.-84. Middlesex School	Co-Ed	9-12	11
60.-84. Miss Hall's School	All-Girls	9-12	11
60.-84. Miss Porter's School	All-Girls	9-12, PG	11
60.-84. Missouri Military Academy	All-Boys	6-12, PG	11
60.-84. Oakdale Christian Academy	Co-Ed	7-12	11
60.-84. Pomfret School	Co-Ed	9-12, PG	11
60.-84. St. Andrew's School, DE	Co-Ed	9-12	11
60.-84. St. John's Northwestern Military Academy	All-Boys	7-12	11
60.-84. St. Margaret's School	All-Girls	8-12	11
60.-84. St. Mark's School	Co-Ed	9-12	11
60.-84. Solebury School	Co-Ed	9-12, PG	11
60.-84. Tabor Academy	Co-Ed	9-12	11
60.-84. Tallulah Falls School	Co-Ed	7-12	11
60.-84. Verde Valley School	Co-Ed	9-12	11
60.-84. Vermont Academy	Co-Ed	9-12, PG	11
60.-84. Wentworth Military Academy & College	Co-Ed	9-12, PG	11
60.-84. Westover School	All-Girls	9-12	11
85.-145. Avon Old Farms School	All-Boys	9-12, PG	12
85.-145. Berkshire School	Co-Ed	9-12, PG	12
85.-145. Brewster Academy	Co-Ed	9-12, PG	12
85.-145. Brooks School	Co-Ed	9-12	12
85.-145. Camden Military Academy	All-Boys	7-12, PG	12
85.-145. Canterbury School	Co-Ed	9-12, PG	12
85.-145. Cheshire Academy	Co-Ed	9-12, PG	12
85.-145. Choate Rosemary Hall	Co-Ed	9-12, PG	12
85.-145. Christchurch School	All-Boys	8-12, PG	12
85.-145. Concord Academy	Co-Ed	9-12	12
85.-145. Cushing Academy	Co-Ed	9-12, PG	12
85.-145. Dana Hall School	All-Girls	9-12	12
85.-145. Deerfield Academy	Co-Ed	9-12, PG	12
85.-145. Episcopal High School	Co-Ed	9-12	12
85.-145. The Ethel Walker School	All-Girls	9-12	12
85.-145. The Forman School	Co-Ed	9-12, PG	12
85.-145. Fountain Valley School of Colorado	Co-Ed	9-12	12
85.-145. The Glenholme School	Co-Ed	6-12, PG	12
85.-145. Gould Academy	Co-Ed	9-12, PG	12
85.-145. The Governor's Academy (formerly Governor Dummer Academy)	Co-Ed	9-12	12
85.-145. The Gunnery	Co-Ed	9-12, PG	12
85.-145. Hebron Academy	Co-Ed	9-12, PG	12
85.-145. High Mowing School	Co-Ed	9-12	12
85.-145. Hill School	Co-Ed	9-12, PG	12
85.-145. The Hotchkiss School	Co-Ed	9-12, PG	12
85.-145. Hyde-Bath	Co-Ed	9-12, PG	12
85.-145. Hyde-Woodstock	Co-Ed	9-12, PG	12
85.-145. Kent School	Co-Ed	9-12, PG	12
85.-145. Kimball Union Academy	Co-Ed	9-12, PG	12
85.-145. La Lumiere School	Co-Ed	9-12, PG	12
85.-145. Lake Forest Academy	Co-Ed	9-12, PG	12
85.-145. Lawrenceville School	Co-Ed	9-12, PG	12
85.-145. The Madeira School	All-Girls	9-12	12
85.-145. Massanutten Military Academy	Co-Ed	7-12, PG	12
85.-145. Mercersburg Academy	Co-Ed	9-12, PG	12
85.-145. Midland School	Co-Ed	9-12	12
85.-145. Miller School	Co-Ed	8-12, PG	12
85.-145. New Hampton School	Co-Ed	9-12, PG	12
85.-145. New York Military Academy	Co-Ed	7-12	12
85.-145. Peddie School	Co-Ed	9-12, PG	12
85.-145. Perkiomen School	Co-Ed	7-12, PG	12
85.-145. Phillips Exeter Academy	Co-Ed	9-12, PG	12
85.-145. Proctor Academy	Co-Ed	9-12	12
85.-145. St. Andrew's School - RI	Co-Ed	9-12	12
85.-145. St. Anne's-Belfield School	Co-Ed	9-12	12
85.-145. Saint James School	Co-Ed	8-12	12
85.-145. St. Johnsbury Academy	Co-Ed	9-12, PG	12
85.-145. Salisbury School	All-Boys	9-12, PG	12
85.-145. San Marcos Baptist Academy	Co-Ed	7-12	12
85.-145. Santa Catalina School	All-Girls	9-12	12
85.-145. Stanstead College	Co-Ed	7-12	12
85.-145. Subiaco Academy	All-Boys	9-12	12
85.-145. Thomas Jefferson School	Co-Ed	7-12, PG	12
85.-145. Tilton School	Co-Ed	9-12, PG	12
85.-145. TMI -The Episcopal School of Texas	Co-Ed	9-12	12
85.-145. Virginia Episcopal School	Co-Ed	9-12	12
85.-145. Wayland Academy	Co-Ed	9-12	12
85.-145. The Webb School	Co-Ed	7-12, PG	12
85.-145. Western Reserve Academy	Co-Ed	9-12, PG	12
85.-145. Westminster School	Co-Ed	9-12, PG	12
85.-145. Wilbraham & Monson Academy	Co-Ed	9-12, PG	12
146.-155. Groton School	Co-Ed	8-12	13
146.-155. Holderness School	Co-Ed	9-12, PG	13
146.-155. The Hun School of Princeton	Co-Ed	9-12, PG	13
146.-155. Leysin American School in Switzerland	Co-Ed	9-12, PG	13
146.-155. Northfield Mount Hermon School	Co-Ed	9-12, PG	13
146.-155. The Pennington School	Co-Ed	7-12	13
146.-155. Phillips Academy Andover	Co-Ed	9-12, PG	13
146.-155. Saint Mary's School	All-Girls	9-12	13
146.-155. Trinity Pawling School	All-Boys	9-12, PG	13
146.-155. The Williston Northampton School	Co-Ed	9-12, PG	13
156.-180. Advanced Academy of Georgia	Co-Ed	11-12	14
156.-180. Army and Navy Academy	All-Boys	7-12	14
156.-180. Asheville School	Co-Ed	9-12	14
156.-180. Baylor School	Co-Ed	9-12	14
156.-180. Carlisle School	Co-Ed	9-12	14
156.-180. Darlington School	Co-Ed	9-12, PG	14
156.-180. Dunn School	Co-Ed	9-12	14
156.-180. George School	Co-Ed	9-12	14
156.-180. Idyllwild Arts Academy	Co-Ed	9-12, PG	14
156.-180. Lawrence Academy	Co-Ed	9-12	14
156.-180. Loomis Chaffee School	Co-Ed	9-12, PG	14
156.-180. The Masters School	Co-Ed	9-12	14
156.-180. McCallie School	All-Boys	9-12	14
156.-180. Millbrook School	Co-Ed	9-12	14
156.-180. Milton Academy	Co-Ed	9-12	14
156.-180. Oldfields School	All-Girls	8-12, PG	14
156.-180. Oregon Episcopal School	Co-Ed	9-12	14
156.-180. Orme School	Co-Ed	8-12, PG	14
156.-180. Portsmouth Abbey School	Co-Ed	9-12	14
156.-180. Rosseau Lake College	Co-Ed	7-12	14
156.-180. St. Andrew's-Sewanee School	Co-Ed	9-12	14
156.-180. San Domenico School	All-Girls	9-12	14
156.-180. Stevenson School	Co-Ed	9-12	14
156.-180. The Stony Brook School	Co-Ed	7-12	14
156.-180. Wyoming Seminary Upper School	Co-Ed	9-12, PG	14
181.-203. The Athenian School	Co-Ed	9-12	15
181.-203. The Bolles School	Co-Ed	7-12, PG	15
181.-203. Bronte College of Canada	Co-Ed	9-12, PG	15
181.-203. CCI The Renaissance School	Co-Ed	10-12, PG	15
181.-203. Conserve School	Co-Ed	9-12	15
181.-203. EduKick Academic Soccer Boarding School Academies	Co-Ed	8-12, PG	15
181.-203. Florida Air Academy	Co-Ed	6-12	15
181.-203. Fork Union Military Academy	All-Boys	6-12, PG	15
181.-203. Fryeburg Academy	Co-Ed	9-12, PG	15
181.-203. Garrison Forest School	All-Girls	8-12	15
181.-203. George Stevens Academy	Co-Ed	9-12	15
181.-203. The Hockaday School	All-Girls	8-12	15
181.-203. Interlochen Arts Academy	Co-Ed	9-12, PG	15
181.-203. New Mexico Military Institute	Co-Ed	9-12, PG	15
181.-203. Oakwood Friends School	Co-Ed	9-12	15
181.-203. The Putney School	Co-Ed	9-12	15
181.-203. Randolph-Macon Academy	Co-Ed	6-12, PG	15
181.-203. Saint Andrew's School	Co-Ed	9-12	15
181.-203. St. Thomas More School	All-Boys	8-12, PG	15
181.-203. Shawnigan Lake School	Co-Ed	8-12	15
181.-203. TASIS The American School in England	Co-Ed	9-12, PG	15
181.-203. The Webb Schools	Co-Ed	9-12	15
181.-203. Westtown School	Co-Ed	9-12	15
204.-230. Admiral Farragut Academy	Co-Ed	6-12	>15
204.-230. Cranbrook Schools	Co-Ed	9-12	>15
204.-230. Culver Academies	Co-Ed	9-12, PG	>15
204.-230. Family First Academy	Co-Ed	8-12	>15
204.-230. Georgetown Preparatory School	All-Boys	9-12	>15
204.-230. Indian Springs School	Co-Ed	9-12	>15
204.-230. Ojai Valley School	Co-Ed	3-12	>15
204.-230. Rabun Gap-Nacoochee School	Co-Ed	7-12	>15
204.-230. St. Catherine's Military Academy	All-Boys	4-8	>15
204.-230. Saint John's Preparatory School	Co-Ed	9-12, PG	>15
204.-230. St. Stephen's Episcopal School	Co-Ed	8-12	>15
204.-230. Shattuck-St. Mary's School	Co-Ed	6-12, PG	>15
204.-230. Brentwood College School	Co-Ed	9-12	>15
204.-230. The Delphian School	Co-Ed	3-12	>15
204.-230. Ridley College	Co-Ed	5-12, PG	>15
204.-230. St. Andrew's College	All-Boys	6-12, PG	>15
204.-230. Villanova Preparatory School	Co-Ed	9-12	>15
204.-230. The Brook Hill School	Co-Ed	8-12	>15
204.-230. Flintridge Sacred Heart Academy	All-Girls	9-12	>15
204.-230. Havergal College	All-Girls	9-12	>15
204.-230. The King's Academy	Co-Ed	7-12	>15
204.-230. Montverde Academy	Co-Ed	7-12, PG	>15
204.-230. St. Michaels University School	Co-Ed	8-12	>15
204.-230. The Bishop Strachan School	All-Girls	7-12	>15
204.-230. Cotter Schools	Co-Ed	9-12, PG	>15
204.-230. Monte Vista Christian School	Co-Ed	9-12	>15
204.-230. Girard College	Co-Ed	1-12	>15

•  View all schools sorted by "average class size"

Top School Listings by Category:

Compare among:  All schools Schools with 400+ students Schools with 200-400 students Schools with < 200 students Military schools only All-girls schools only All-boys schools only •  Community Size - Largest student body (number of students) •  Community Size - Smallest student body (number of students) •  Boarding Focus - Highest percentage of boarding students •  Diversity - Highest percentage of international students •  Diversity - Highest percentage of students of color •  Affordability - Least expensive tuition •  Affordability - Highest percentage of students on financial aid •  Student Attention - Smallest average class sizes •  Student Attention - Lowest teacher:student ratio •  Faculty Education - Highest percentage of faculty with advanced degrees •  School Resources - Largest endowments •  Selectivity - Lowest acceptance rates •  Offering Breadth - Most sports offered •  Offering Breadth - Most extracurriculars offered •  Offering Breadth - Most AP/advanced courses offered •  Student Test Scores - Highest average SAT scores •  School History - Oldest founding date