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.-7.  Grand River Academy	All-Boys	9-12, PG	7
5.-7.  Nawa Academy	Co-Ed	7-12	7
5.-7.  The Phelps School	All-Boys	7-12, PG	7
8.-18.  Academy of the Holy Family	All-Girls	9-12, PG	8
8.-18.  Hoosac School	Co-Ed	8-12, PG	8
8.-18. Howe Military School & Summer Camp	Co-Ed	5-12	8
8.-18. Landmark School	Co-Ed	9-12	8
8.-18. The Leelanau School	Co-Ed	9-12	8
8.-18. Linden Hall	All-Girls	6-12, PG	8
8.-18. Lowell Whiteman School	Co-Ed	9-12	8
8.-18. The Marvelwood School	Co-Ed	9-12, PG	8
8.-18. Oliverian School	Co-Ed	9-12, PG	8
8.-18. The Outdoor Academy	Co-Ed	10-11	8
8.-18. West Nottingham Academy	Co-Ed	9-12, PG	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	6-12, PG	9
19.-27. Northwood School	Co-Ed	9-12, PG	9
19.-27. Squaw Valley Academy	Co-Ed	6-12	9
19.-27. The Storm King 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	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. Oldfields School	All-Girls	8-12, PG	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. Mark'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. The Thacher School	Co-Ed	9-12	10
28.-59. Woodberry Forest School	All-Boys	9-12	10
60.-83. Berkshire School	Co-Ed	9-12, PG	11
60.-83. Brenau Academy	All-Girls	9-12, PG	11
60.-83. Canterbury School	Co-Ed	9-12, PG	11
60.-83. Christ School	All-Boys	8-12	11
60.-83. Emma Willard School	All-Girls	9-12, PG	11
60.-83. Hargrave Military Academy	All-Boys	7-12, PG	11
60.-83. Kents Hill School	Co-Ed	9-12, PG	11
60.-83. The MacDuffie School	Co-Ed	9-12	11
60.-83. Middlesex School	Co-Ed	9-12	11
60.-83. Miss Hall's School	All-Girls	9-12	11
60.-83. Miss Porter's School	All-Girls	9-12, PG	11
60.-83. Missouri Military Academy	All-Boys	6-12, PG	11
60.-83. Oakdale Christian Academy	Co-Ed	7-12	11
60.-83. Pomfret School	Co-Ed	9-12, PG	11
60.-83. St. Andrew's School, DE	Co-Ed	9-12	11
60.-83. St. George's School	Co-Ed	9-12	11
60.-83. St. John's Northwestern Military Academy	All-Boys	7-12	11
60.-83. St. Margaret's School	All-Girls	8-12	11
60.-83. Solebury School	Co-Ed	9-12	11
60.-83. Tallulah Falls School	Co-Ed	7-12	11
60.-83. Verde Valley School	Co-Ed	9-12	11
60.-83. Vermont Academy	Co-Ed	9-12, PG	11
60.-83. Wentworth Military Academy & College	Co-Ed	9-12, PG	11
60.-83. Westover School	All-Girls	9-12	11
84.-146. Avon Old Farms School	All-Boys	9-12, PG	12
84.-146. Brewster Academy	Co-Ed	9-12, PG	12
84.-146. Brooks School	Co-Ed	9-12	12
84.-146. The Cambridge School of Weston	Co-Ed	9-12, PG	12
84.-146. Camden Military Academy	All-Boys	7-12, PG	12
84.-146. Cheshire Academy	Co-Ed	9-12, PG	12
84.-146. Choate Rosemary Hall	Co-Ed	9-12, PG	12
84.-146. Christchurch School	All-Boys	8-12, PG	12
84.-146. Concord Academy	Co-Ed	9-12	12
84.-146. Cushing Academy	Co-Ed	9-12, PG	12
84.-146. Dana Hall School	All-Girls	9-12	12
84.-146. Deerfield Academy	Co-Ed	9-12, PG	12
84.-146. Episcopal High School	Co-Ed	9-12	12
84.-146. The Ethel Walker School	All-Girls	9-12	12
84.-146. The Forman School	Co-Ed	9-12, PG	12
84.-146. Fountain Valley School of Colorado	Co-Ed	9-12	12
84.-146. The Glenholme School	Co-Ed	6-12, PG	12
84.-146. Gould Academy	Co-Ed	9-12, PG	12
84.-146. The Governor's Academy (formerly Governor Dummer Academy)	Co-Ed	9-12	12
84.-146. The Gunnery	Co-Ed	9-12, PG	12
84.-146. Hawaii Preparatory Academy	Co-Ed	6-12, PG	12
84.-146. Hebron Academy	Co-Ed	9-12, PG	12
84.-146. High Mowing School	Co-Ed	9-12	12
84.-146. Hill School	Co-Ed	9-12, PG	12
84.-146. The Hotchkiss School	Co-Ed	9-12, PG	12
84.-146. Hyde-Bath	Co-Ed	9-12, PG	12
84.-146. Hyde-Woodstock	Co-Ed	9-12, PG	12
84.-146. Kent School	Co-Ed	9-12, PG	12
84.-146. Kimball Union Academy	Co-Ed	9-12, PG	12
84.-146. La Lumiere School	Co-Ed	9-12, PG	12
84.-146. Lake Forest Academy	Co-Ed	9-12, PG	12
84.-146. Lawrenceville School	Co-Ed	9-12, PG	12
84.-146. The Madeira School	All-Girls	9-12	12
84.-146. Massanutten Military Academy	Co-Ed	7-12, PG	12
84.-146. Mercersburg Academy	Co-Ed	9-12, PG	12
84.-146. Midland School	Co-Ed	9-12	12
84.-146. Miller School	Co-Ed	8-12, PG	12
84.-146. New Hampton School	Co-Ed	9-12, PG	12
84.-146. New York Military Academy	Co-Ed	7-12	12
84.-146. Peddie School	Co-Ed	9-12, PG	12
84.-146. Perkiomen School	Co-Ed	7-12, PG	12
84.-146. Phillips Exeter Academy	Co-Ed	9-12, PG	12
84.-146. Proctor Academy	Co-Ed	9-12, PG	12
84.-146. St. Andrew's School - RI	Co-Ed	9-12	12
84.-146. St. Anne's-Belfield School	Co-Ed	9-12	12
84.-146. Saint James School	Co-Ed	8-12	12
84.-146. St. Johnsbury Academy	Co-Ed	9-12, PG	12
84.-146. Salisbury School	All-Boys	9-12, PG	12
84.-146. San Domenico School	All-Girls	9-12	12
84.-146. San Marcos Baptist Academy	Co-Ed	7-12	12
84.-146. Santa Catalina School	All-Girls	9-12	12
84.-146. Stanstead College	Co-Ed	7-12	12
84.-146. Subiaco Academy	All-Boys	8-12	12
84.-146. Tabor Academy	Co-Ed	9-12	12
84.-146. Thomas Jefferson School	Co-Ed	7-12, PG	12
84.-146. Tilton School	Co-Ed	9-12, PG	12
84.-146. TMI -The Episcopal School of Texas	Co-Ed	9-12	12
84.-146. Virginia Episcopal School	Co-Ed	9-12	12
84.-146. Wayland Academy	Co-Ed	9-12	12
84.-146. The Webb School	Co-Ed	7-12, PG	12
84.-146. Western Reserve Academy	Co-Ed	9-12, PG	12
84.-146. Westminster School	Co-Ed	9-12, PG	12
84.-146. Wilbraham & Monson Academy	Co-Ed	9-12, PG	12
147.-157. Groton School	Co-Ed	8-12	13
147.-157. Holderness School	Co-Ed	9-12, PG	13
147.-157. The Hun School of Princeton	Co-Ed	9-12, PG	13
147.-157. Leysin American School in Switzerland	Co-Ed	8-12, PG	13
147.-157. The Pennington School	Co-Ed	7-12	13
147.-157. Phillips Academy Andover	Co-Ed	9-12, PG	13
147.-157. Saint Mary's School	All-Girls	9-12	13
147.-157. The Stony Brook School	Co-Ed	7-12	13
147.-157. Trinity Pawling School	All-Boys	9-12, PG	13
147.-157. Wasatch Academy	Co-Ed	9-12, PG	13
147.-157. The Williston Northampton School	Co-Ed	9-12, PG	13
158.-180. Advanced Academy of Georgia	Co-Ed	11-12	14
158.-180. Army and Navy Academy	All-Boys	7-12	14
158.-180. Asheville School	Co-Ed	9-12	14
158.-180. Baylor School	Co-Ed	9-12	14
158.-180. Carlisle School	Co-Ed	9-12	14
158.-180. Darlington School	Co-Ed	9-12, PG	14
158.-180. Dunn School	Co-Ed	9-12	14
158.-180. George School	Co-Ed	9-12	14
158.-180. Idyllwild Arts Academy	Co-Ed	9-12, PG	14
158.-180. Lawrence Academy	Co-Ed	9-12	14
158.-180. Loomis Chaffee School	Co-Ed	9-12, PG	14
158.-180. The Masters School	Co-Ed	9-12	14
158.-180. McCallie School	All-Boys	9-12	14
158.-180. Millbrook School	Co-Ed	9-12	14
158.-180. Milton Academy	Co-Ed	9-12	14
158.-180. Northfield Mount Hermon School	Co-Ed	9-12, PG	14
158.-180. Oregon Episcopal School	Co-Ed	9-12	14
158.-180. Orme School	Co-Ed	8-12, PG	14
158.-180. Portsmouth Abbey School	Co-Ed	9-12	14
158.-180. Rosseau Lake College	Co-Ed	7-12	14
158.-180. St. Andrew's-Sewanee School	Co-Ed	9-12	14
158.-180. Stevenson School	Co-Ed	9-12	14
158.-180. Wyoming Seminary Upper School	Co-Ed	9-12, PG	14
181.-202. The Athenian School	Co-Ed	9-12	15
181.-202. The Bolles School	Co-Ed	7-12, PG	15
181.-202. Bronte College of Canada	Co-Ed	9-12, PG	15
181.-202. CCI The Renaissance School	Co-Ed	10-12, PG	15
181.-202. Conserve School	Co-Ed	9-12	15
181.-202. EduKick Academic Soccer (Sports) Boarding School Academies	Co-Ed	8-12, PG	15
181.-202. Florida Air Academy	Co-Ed	6-12	15
181.-202. Fork Union Military Academy	All-Boys	6-12, PG	15
181.-202. Fryeburg Academy	Co-Ed	9-12, PG	15
181.-202. Garrison Forest School	All-Girls	8-12	15
181.-202. George Stevens Academy	Co-Ed	9-12	15
181.-202. The Hockaday School	All-Girls	8-12	15
181.-202. Interlochen Arts Academy	Co-Ed	9-12, PG	15
181.-202. New Mexico Military Institute	Co-Ed	9-12, PG	15
181.-202. Oakwood Friends School	Co-Ed	9-12	15
181.-202. The Putney School	Co-Ed	9-12	15
181.-202. Randolph-Macon Academy	Co-Ed	6-12, PG	15
181.-202. Saint Andrew's School	Co-Ed	9-12	15
181.-202. St. Thomas More School	All-Boys	8-12, PG	15
181.-202. Shawnigan Lake School	Co-Ed	8-12	15
181.-202. TASIS The American School in England	Co-Ed	9-12, PG	15
181.-202. Westtown School	Co-Ed	9-12	15
203.-232. Admiral Farragut Academy	Co-Ed	6-12	>15
203.-232. Cranbrook Schools	Co-Ed	9-12	>15
203.-232. Culver Academies	Co-Ed	9-12, PG	>15
203.-232. Family First Academy	Co-Ed	8-12	>15
203.-232. Georgetown Preparatory School	All-Boys	9-12	>15
203.-232. Houghton Academy	Co-Ed	9-12, PG	>15
203.-232. Indian Springs School	Co-Ed	9-12	>15
203.-232. Ojai Valley School	Co-Ed	3-12	>15
203.-232. Rabun Gap-Nacoochee School	Co-Ed	7-12	>15
203.-232. St. Catherine's Military Academy	All-Boys	4-8	>15
203.-232. Saint John's Preparatory School	Co-Ed	9-12, PG	>15
203.-232. St. Stephen's Episcopal School	Co-Ed	8-12	>15
203.-232. Shattuck-St. Mary's School	Co-Ed	6-12, PG	>15
203.-232. The Webb Schools	Co-Ed	9-12	>15
203.-232. Ashbury College	Co-Ed	9-12	>15
203.-232. Brentwood College School	Co-Ed	9-12	>15
203.-232. The Delphian School	Co-Ed	3-12	>15
203.-232. Ridley College	Co-Ed	5-12, PG	>15
203.-232. St. Andrew's College	All-Boys	6-12	>15
203.-232. Villanova Preparatory School	Co-Ed	9-12	>15
203.-232. The Brook Hill School	Co-Ed	8-12	>15
203.-232. Flintridge Sacred Heart Academy	All-Girls	9-12	>15
203.-232. Havergal College	All-Girls	9-12	>15
203.-232. The King's Academy	Co-Ed	7-12	>15
203.-232. Montverde Academy	Co-Ed	7-12, PG	>15
203.-232. St. Michaels University School	Co-Ed	8-12	>15
203.-232. The Bishop Strachan School	All-Girls	7-12	>15
203.-232. Cotter Schools	Co-Ed	9-12, PG	>15
203.-232. Monte Vista Christian School	Co-Ed	9-12	>15
203.-232. 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