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"

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 •  School Resources - Endowment per student •  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 •  Student Test Scores - Highest average SSAT score •  School History - Oldest founding date