Smallest Average Class Size
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.
Smallest Average Class Sizes:

Among All Schools (out of 247 schools)

Sorted by range (alphabetically within range) * Indicates Boarding Grades Offered
1.  The Oxford AcademyAll-Boys
9-12, PG
1
2.  Brandon Hall SchoolCo-Ed
4-12, PG
4
3.  The Gow SchoolAll-Boys
7-12, PG
5
4.  The Winchendon SchoolCo-Ed
9-12, PG
6
5.-7.  Grand River AcademyAll-Boys
9-12, PG
7
5.-7.  Nawa AcademyCo-Ed
7-12
7
5.-7.  West Nottingham AcademyCo-Ed
9-12, PG
7
8.-18.  Academy of the Holy FamilyAll-Girls
9-12, PG
8
8.-18.  Dublin SchoolCo-Ed
9-12
8
8.-18. Hoosac SchoolCo-Ed
8-12, PG
8
8.-18. Howe Military School & Summer CampCo-Ed
5-12
8
8.-18. Landmark SchoolCo-Ed
9-12
8
8.-18. The Leelanau SchoolCo-Ed
9-12
8
8.-18. Linden HallAll-Girls
6-12, PG
8
8.-18. Lowell Whiteman SchoolCo-Ed
9-12
8
8.-18. The Marvelwood SchoolCo-Ed
9-12, PG
8
8.-18. Oliverian SchoolCo-Ed
9-12, PG
8
8.-18. The Outdoor AcademyCo-Ed
10-11
8
19.-26. Blue Ridge SchoolAll-Boys
9-12
9
19.-26. Buxton SchoolCo-Ed
9-12
9

Sorted by range (alphabetically within range) * Indicates Boarding Grades Offered
19.-26. Chatham HallAll-Girls
9-12
9
19.-26. Darrow SchoolCo-Ed
9-12
9
19.-26. Grier SchoolAll-Girls
6-12, PG
9
19.-26. Northwood SchoolCo-Ed
9-12, PG
9
19.-26. Squaw Valley AcademyCo-Ed
6-12
9
19.-26. The White Mountain SchoolCo-Ed
9-12, PG
9
27.-62. Academy of St. XavierAll-Boys
7-12
10
27.-62. Andrews Osborne AcademyCo-Ed
7-12
10
27.-62. Annie Wright SchoolAll-Girls
9-12
10
27.-62. Besant Hill School (Formerly Happy Valley School)Co-Ed
9-12
10
27.-62. Blair AcademyCo-Ed
9-12, PG
10
27.-62. Bridgton AcademyAll-Boys
12-12, PG
10
27.-62. Cate SchoolCo-Ed
9-12
10
27.-62. CFS, The School at Church FarmAll-Boys
7-12
10
27.-62. Chapel Hill-Chauncy HallCo-Ed
9-12, PG
10
27.-62. Colorado Rocky Mountain SchoolCo-Ed
9-12
10
27.-62. Country Day School, Costa RicaCo-Ed
8-12
10
27.-62. Fishburne Military SchoolAll-Boys
8-12
10
27.-62. The Forman SchoolCo-Ed
9-12, PG
10
27.-62. Foxcroft SchoolAll-Girls
9-12
10
27.-62. The Kiski SchoolAll-Boys
9-12, PG
10
27.-62. The Knox SchoolCo-Ed
7-12
10
27.-62. Maharishi Academy of Total KnowledgeAll-Boys
9-12
10
27.-62. Massanutten Military AcademyCo-Ed
7-12, PG
10
27.-62. Oak Hill AcademyCo-Ed
8-12
10
27.-62. Oldfields SchoolAll-Girls
8-12, PG
10
27.-62. Olney Friends SchoolCo-Ed
9-12
10
27.-62. Purnell SchoolAll-Girls
9-12
10
27.-62. Riverside Military AcademyAll-Boys
7-12, PG
10
27.-62. St. Andrew's School - RICo-Ed
9-12
10
27.-62. St. Mark's SchoolCo-Ed
9-12
10
27.-62. St. Paul's SchoolCo-Ed
9-12
10
27.-62. St. Timothy's SchoolAll-Girls
9-12, PG
10
27.-62. Salem AcademyAll-Girls
9-12
10
27.-62. Scattergood Friends SchoolCo-Ed
9-12, PG
10
27.-62. South Kent SchoolAll-Boys
9-12, PG
10
27.-62. Stoneleigh-Burnham SchoolAll-Girls
7-12, PG
10
27.-62. Stuart Hall SchoolAll-Girls
8-12
10
27.-62. Suffield AcademyCo-Ed
9-12, PG
10
27.-62. The Thacher SchoolCo-Ed
9-12
10
27.-62. Virginia Episcopal SchoolCo-Ed
9-12
10
27.-62. Woodberry Forest SchoolAll-Boys
9-12
10
63.-85. Berkshire SchoolCo-Ed
9-12, PG
11
63.-85. Brenau AcademyAll-Girls
9-12, PG
11
63.-85. Canterbury SchoolCo-Ed
9-12, PG
11
63.-85. Christ SchoolAll-Boys
8-12
11
63.-85. Emma Willard SchoolAll-Girls
9-12, PG
11
63.-85. Hargrave Military AcademyAll-Boys
7-12, PG
11
63.-85. Kents Hill SchoolCo-Ed
9-12, PG
11
63.-85. The MacDuffie SchoolCo-Ed
9-12
11
63.-85. Miss Hall's SchoolAll-Girls
9-12
11
63.-85. Miss Porter's SchoolAll-Girls
9-12, PG
11
63.-85. Missouri Military AcademyAll-Boys
6-12, PG
11
63.-85. Oakdale Christian AcademyCo-Ed
7-12
11
63.-85. Pomfret SchoolCo-Ed
9-12, PG
11
63.-85. St. Andrew's School, DECo-Ed
9-12
11
63.-85. St. George's SchoolCo-Ed
9-12
11
63.-85. St. John's Northwestern Military AcademyAll-Boys
7-12, PG
11
63.-85. St. Margaret's SchoolAll-Girls
8-12
11
63.-85. Solebury SchoolCo-Ed
9-12
11
63.-85. Tallulah Falls SchoolCo-Ed
7-12
11
63.-85. Verde Valley SchoolCo-Ed
9-12
11
63.-85. Vermont AcademyCo-Ed
9-12, PG
11
63.-85. Wentworth Military Academy & CollegeCo-Ed
9-12, PG
11
63.-85. Westover SchoolAll-Girls
9-12
11
86.-152. Avon Old Farms SchoolAll-Boys
9-12, PG
12
86.-152. Brewster AcademyCo-Ed
9-12, PG
12
86.-152. Brooks SchoolCo-Ed
9-12
12
86.-152. The Cambridge School of WestonCo-Ed
9-12, PG
12
86.-152. Camden Military AcademyAll-Boys
7-12, PG
12
86.-152. CCI The Renaissance SchoolCo-Ed
10-12, PG
12
86.-152. Cheshire AcademyCo-Ed
9-12, PG
12
86.-152. Choate Rosemary HallCo-Ed
9-12, PG
12
86.-152. Concord AcademyCo-Ed
9-12
12
86.-152. Cushing AcademyCo-Ed
9-12, PG
12
86.-152. Dana Hall SchoolAll-Girls
9-12
12
86.-152. Deerfield AcademyCo-Ed
9-12, PG
12
86.-152. Episcopal High SchoolCo-Ed
9-12
12
86.-152. The Ethel Walker SchoolAll-Girls
9-12
12
86.-152. Fountain Valley School of ColoradoCo-Ed
9-12
12
86.-152. The Glenholme SchoolCo-Ed
5-12, PG
12
86.-152. Gould AcademyCo-Ed
9-12, PG
12
86.-152. The Governor's Academy
(formerly Governor Dummer Academy)
Co-Ed
9-12
12
86.-152. The GunneryCo-Ed
9-12, PG
12
86.-152. Hawaii Preparatory AcademyCo-Ed
6-12, PG
12
86.-152. Hebron AcademyCo-Ed
9-12, PG
12
86.-152. High Mowing SchoolCo-Ed
9-12
12
86.-152. Hill SchoolCo-Ed
9-12, PG
12
86.-152. Holderness SchoolCo-Ed
9-12, PG
12
86.-152. The Hotchkiss SchoolCo-Ed
9-12, PG
12
86.-152. Hyde-BathCo-Ed
9-12, PG
12
86.-152. Hyde-WoodstockCo-Ed
9-12, PG
12
86.-152. Kent SchoolCo-Ed
9-12, PG
12
86.-152. Kimball Union AcademyCo-Ed
9-12, PG
12
86.-152. La Lumiere SchoolCo-Ed
9-12, PG
12
86.-152. Lake Forest AcademyCo-Ed
9-12, PG
12
86.-152. Lawrenceville SchoolCo-Ed
9-12, PG
12
86.-152. Loomis Chaffee SchoolCo-Ed
9-12, PG
12
86.-152. The Madeira SchoolAll-Girls
9-12
12
86.-152. Mercersburg AcademyCo-Ed
9-12, PG
12
86.-152. Middlesex SchoolCo-Ed
9-12
12
86.-152. Midland SchoolCo-Ed
9-12
12
86.-152. Miller SchoolCo-Ed
8-12, PG
12
86.-152. New Hampton SchoolCo-Ed
9-12, PG
12
86.-152. New York Military AcademyCo-Ed
7-12, PG
12
86.-152. Peddie SchoolCo-Ed
9-12, PG
12
86.-152. Perkiomen SchoolCo-Ed
7-12, PG
12
86.-152. The Phelps SchoolAll-Boys
7-12, PG
12
86.-152. Phillips Exeter AcademyCo-Ed
9-12, PG
12
86.-152. Proctor AcademyCo-Ed
9-12, PG
12
86.-152. Rosseau Lake CollegeCo-Ed
7-12, PG
12
86.-152. St. Anne's-Belfield SchoolCo-Ed
9-12
12
86.-152. Saint James SchoolCo-Ed
8-12
12
86.-152. St. Johnsbury AcademyCo-Ed
9-12, PG
12
86.-152. St. Thomas More SchoolAll-Boys
8-12, PG
12
86.-152. Salisbury SchoolAll-Boys
9-12, PG
12
86.-152. San Domenico SchoolAll-Girls
9-12
12
86.-152. San Marcos Baptist AcademyCo-Ed
7-12
12
86.-152. Santa Catalina SchoolAll-Girls
9-12
12
86.-152. Shattuck-St. Mary's SchoolCo-Ed
6-12, PG
12
86.-152. Stanstead CollegeCo-Ed
7-12
12
86.-152. The Storm King SchoolCo-Ed
8-12
12
86.-152. Subiaco AcademyAll-Boys
8-12
12
86.-152. Tabor AcademyCo-Ed
9-12
12
86.-152. Thomas Jefferson SchoolCo-Ed
7-12, PG
12
86.-152. Tilton SchoolCo-Ed
9-12, PG
12
86.-152. TMI -The Episcopal School of TexasCo-Ed
9-12
12
86.-152. Wayland AcademyCo-Ed
9-12
12
86.-152. The Webb SchoolCo-Ed
7-12, PG
12
86.-152. Western Reserve AcademyCo-Ed
9-12, PG
12
86.-152. Westminster SchoolCo-Ed
9-12, PG
12
86.-152. Wilbraham & Monson AcademyCo-Ed
9-12, PG
12
153.-165. Groton SchoolCo-Ed
8-12
13
153.-165. The Hun School of PrincetonCo-Ed
9-12, PG
13
153.-165. Leysin American School in Switzerland (LAS)Co-Ed
8-12, PG
13
153.-165. The Pennington SchoolCo-Ed
7-12
13
153.-165. Phillips Academy AndoverCo-Ed
9-12, PG
13
153.-165. Randolph-Macon AcademyCo-Ed
6-12, PG
13
153.-165. St. Albans SchoolAll-Boys
9-12
13
153.-165. Saint Mary's SchoolAll-Girls
9-12
13
153.-165. The Stony Brook SchoolCo-Ed
7-12
13
153.-165. Trinity Pawling SchoolAll-Boys
9-12, PG
13
153.-165. Valley Forge Military AcademyAll-Boys
7-12, PG
13
153.-165. Wasatch AcademyCo-Ed
9-12, PG
13
153.-165. The Williston Northampton SchoolCo-Ed
9-12, PG
13
166.-188. Asheville SchoolCo-Ed
9-12
14
166.-188. Baylor SchoolCo-Ed
9-12
14
166.-188. Carlisle SchoolCo-Ed
9-12
14
166.-188. Christchurch SchoolAll-Boys
9-12, PG
14
166.-188. Darlington SchoolCo-Ed
9-12, PG
14
166.-188. George SchoolCo-Ed
9-12
14
166.-188. Idyllwild Arts AcademyCo-Ed
9-12, PG
14
166.-188. Lawrence AcademyCo-Ed
9-12
14
166.-188. The Masters SchoolCo-Ed
9-12
14
166.-188. McCallie SchoolAll-Boys
9-12
14
166.-188. Millbrook SchoolCo-Ed
9-12
14
166.-188. Milton AcademyCo-Ed
9-12
14
166.-188. North Broward Preparatory SchoolCo-Ed
7-12
14
166.-188. Northfield Mount Hermon SchoolCo-Ed
9-12, PG
14
166.-188. Ojai Valley SchoolCo-Ed
3-12
14
166.-188. Oregon Episcopal SchoolCo-Ed
9-12
14
166.-188. The Orme School of ArizonaCo-Ed
8-12, PG
14
166.-188. Portsmouth Abbey SchoolCo-Ed
9-12
14
166.-188. St. Andrew's-Sewanee SchoolCo-Ed
9-12
14
166.-188. Sedbergh SchoolCo-Ed
7-12
14
166.-188. Stevenson SchoolCo-Ed
9-12
14
166.-188. Washington AcademyCo-Ed
9-12, PG
14
166.-188. Wyoming Seminary Upper SchoolCo-Ed
9-12, PG
14
189.-206. Army and Navy AcademyAll-Boys
7-12
15
189.-206. The Athenian SchoolCo-Ed
9-12
15
189.-206. The Bolles SchoolCo-Ed
7-12, PG
15
189.-206. EduKick Academic Soccer (Sports) Boarding School AcademiesCo-Ed
8-12, PG
15
189.-206. Florida Air AcademyCo-Ed
6-12
15
189.-206. Fork Union Military AcademyAll-Boys
6-12, PG
15
189.-206. Fryeburg AcademyCo-Ed
9-12, PG
15
189.-206. Garrison Forest SchoolAll-Girls
8-12
15
189.-206. George Stevens AcademyCo-Ed
9-12
15
189.-206. The Hockaday SchoolAll-Girls
8-12
15
189.-206. Interlochen Arts AcademyCo-Ed
9-12, PG
15
189.-206. New Mexico Military InstituteCo-Ed
9-12, PG
15
189.-206. Oakwood Friends SchoolCo-Ed
9-12
15
189.-206. The Putney SchoolCo-Ed
9-12, PG
15
189.-206. Saint Andrew's SchoolCo-Ed
9-12
15
189.-206. Shawnigan Lake SchoolCo-Ed
8-12
15
189.-206. TASIS The American School in EnglandCo-Ed
9-12, PG
15
189.-206. Westtown SchoolCo-Ed
9-12
15
207.-238. Admiral Farragut AcademyCo-Ed
6-12
>15
207.-238. Brentwood College SchoolCo-Ed
9-12
>15
207.-238. Bronte College of CanadaCo-Ed
9-12, PG
>15
207.-238. Cranbrook SchoolsCo-Ed
9-12
>15
207.-238. Culver AcademiesCo-Ed
9-12
>15
207.-238. Dunn SchoolCo-Ed
9-12
>15
207.-238. Foxcroft AcademyCo-Ed
9-12, PG
>15
207.-238. Georgetown Preparatory SchoolAll-Boys
9-12
>15
207.-238. Houghton AcademyCo-Ed
9-12, PG
>15
207.-238. Indian Springs SchoolCo-Ed
9-12
>15
207.-238. Rabun Gap-Nacoochee SchoolCo-Ed
7-12
>15
207.-238. St. Catherine's Military AcademyAll-Boys
4-8
>15
207.-238. Saint John's Preparatory SchoolCo-Ed
9-12, PG
>15
207.-238. St. Stephen's Episcopal SchoolCo-Ed
8-12
>15
207.-238. Villanova Preparatory SchoolCo-Ed
9-12
>15
207.-238. The Webb SchoolsCo-Ed
9-12
>15
207.-238. Ashbury CollegeCo-Ed
9-12
>15
207.-238. The Delphian SchoolCo-Ed
3-12
>15
207.-238. St. Andrew's CollegeAll-Boys
6-12
>15
207.-238. The Brook Hill SchoolCo-Ed
8-12
>15
207.-238. Flintridge Sacred Heart AcademyAll-Girls
9-12
>15
207.-238. Havergal CollegeAll-Girls
9-12
>15
207.-238. The King's AcademyCo-Ed
7-12
>15
207.-238. Montverde AcademyCo-Ed
7-12, PG
>15
207.-238. St. Michaels University SchoolCo-Ed
8-12
>15
207.-238. Woodside Priory School (The Priory)Co-Ed
9-12
>15
207.-238. The Bishop Strachan SchoolAll-Girls
7-12
>15
207.-238. Cotter SchoolsCo-Ed
9-12, PG
>15
207.-238. Monte Vista Christian SchoolCo-Ed
9-12
>15
207.-238. Ridley CollegeCo-Ed
Pre-K-12, PG
>15
207.-238. Family First AcademyCo-Ed
8-12
>15
207.-238. Girard CollegeCo-Ed
1-12
>15

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