Smallest Average Class Size

Among "Schools with 400+ Students", view the boarding schools with the smallest average class sizes (2026).
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.
# Students Range: 6 20 Avg. # Students: 14

Smallest Average Class Size

Among Schools with 400+ Students (out of 78 schools)

Sorted by range (alphabetically within range)
Boarding School
# Students
Grades
Location
Rank: #11
Landmark School
(2)
# Students: 6
Grades: 9-12  | 2-12 (day)
429 Hale Street
Prides Crossing, MA 01965
(978) 236-3000
Rank: #2-42.-4
Mercersburg Academy
Mercersburg Academy Photo
(20)
# Students: 10
Grades: 9-12, PG
100 Academy Drive
Mercersburg, PA 17236
(717) 328-6173
Rank: #3-83.-8
Blair Academy
(9)
# Students: 11
Grades: 9-12, PG
2 Park St
Blairstown, NJ 07825
(908) 362-2009
Rank: #3-83.-8
Episcopal High School
Episcopal High School Photo - Football
(Episcopal)
(12)
# Students: 11
Grades: 9-12
1200 N. Quaker Lane
Alexandria, VA 22302
(703) 933-4062
# Students: 11
Grades: 9-12
1 Elm Street
Byfield, MA 01922
(978) 499-3120
Rank: #3-83.-8
The Taft School
The Taft School Photo - Our beautiful campus features facilities that rival those of many small colleges, including a library with 55,000 print volumes; a 45,000 square foot science and mathematics building; two theaters; two ice hockey rinks; and an 18-hole golf course.
(3)
# Students: 11
Grades: 9-12, PG
110 Woodbury Road
Watertown, CT 06795
(860) 945-7700
Rank: #7-337.-33
Avon Old Farms School
All-Boys
(6)
# Students: 12
Grades: 9-12, PG
500 Old Farms Road
Avon, CT 06001
(800) 464-2866
Rank: #7-337.-33
Berkshire School
(17)
# Students: 12
Grades: 9-12, PG
245 North Undermountain Road
Sheffield, MA 01257
(413) 229-1003
Rank: #7-337.-33
Bodwell High School
# Students: 12
Grades: 8-12
955 Harbourside Drive
North Vancouver, BC, Canada V7P 3S4
(604) 998-1000
Rank: #7-337.-33
Choate Rosemary Hall
(30)
# Students: 12
Grades: 9-12, PG
333 Christian Street
Wallingford, CT 06492
(203) 697-2239
Rank: #7-337.-33
Dana Hall School
All-Girls
(6)
# Students: 12
Grades: 9-12  | 5-12 (day)
45 Dana Road
Wellesley, MA 02482
(781) 489-1331
Rank: #7-337.-33
Deerfield Academy
(14)
# Students: 12
Grades: 9-12, PG
7 Boyden Lane
Deerfield, MA 01342
(413) 774-1400
Rank: #7-337.-33
Foxcroft Academy
(1)
# Students: 12
Grades: 9-12, PG
975 West Main Street
Dover Foxcroft, ME 04426
(207) 564-8664
Rank: #7-337.-33
Hill School
Hill School Photo - The Hill School sets a high standard for students in their dress and appearance to express pride in themselves and their respect for one another. Academic Dress is worn throughout the academic day whenever students are in an academic or public area, chapel services, sit-down meals, required evening performance, or any other designated occasion.
(8)
# Students: 12
Grades: 9-12, PG
860 Beech Street
Pottstown, PA 19464
(610) 326-1000
Rank: #7-337.-33
IMG Academy
(2)
# Students: 12
Grades: 6-12, PG
5650 Bollettieri Blvd
Bradenton, FL 34210
(800) 872-6425
Rank: #7-337.-33
# Students: 12
Grades: 9-12, PG
4000 J Maddy Pkwy
Interlochen, MI 49643
(231) 276-7472
Rank: #7-337.-33
Lake Forest Academy
(2)
# Students: 12
Grades: 9-12, PG
1500 West Kennedy Road
Lake Forest, IL 60045
(847) 615-3267
Rank: #7-337.-33
Lawrenceville School
(6)
# Students: 12
Grades: 9-12, PG
2500 Main Street
Lawrenceville, NJ 08648
(609) 895-2030
Rank: #7-337.-33
The Linsly School
The Linsly School Photo - Linsly's lower school (grades 5-8) program of studies emphasizes the mastery of fundamental concepts through innovative cross-curricular programs and regimented learning, all of which are designed to prepare students for college preparatory curriculum of the upper school (grades 9-12).
# Students: 12
Grades: 7-12  | 5-12 (day)
60 Knox Lane
Wheeling, WV 26003
(304) 233-1436
Rank: #7-337.-33
Loomis Chaffee
Loomis Chaffee Photo - Loomis` beautiful 300-acre campus is located at the confluence of the Farmington and Connecticut rivers in Windsor, Connecticut. Affectionately referred to as the Island, Loomis is within walking distance of the town`s center, Amtrak train station, and other areas of interest.
(30)
# Students: 12
Grades: 9-12, PG
4 Batchelder Road
Windsor, CT 06095
(860) 687-6400
Rank: #7-337.-33
Lyndon Institute
# Students: 12
Grades: 9-12, PG
PO Box 127, 168 Institute Circle
Lyndon Center, VT 05850
(802) 535-3700
Rank: #7-337.-33
Middlesex School
(non-sectarian)
(29)
# Students: 12
Grades: 9-12
1400 Lowell Road
Concord, MA 01742
(978) 371-6524
Rank: #7-337.-33
Northfield Mount Hermon
(secular)
(14)
# Students: 12
Grades: 9-12, PG
One Lamplighter Way
Mount Hermon, MA 01354
(413) 498-3227
Rank: #7-337.-33
Phillips Exeter Academy
(29)
# Students: 12
Grades: 9-12, PG
20 Main Street
Exeter, NH 03833
(603) 777-3437
Rank: #7-337.-33
Rabun Gap-Nacoochee School
(Presbyterian)
(1)
# Students: 12
Grades: 7-12  | PK-12 (day)
339 Nacoochee Drive
Rabun Gap, GA 30568
(706) 746-7720
Rank: #7-337.-33
St. Johnsbury Academy
(3)
# Students: 12
Grades: 9-12, PG
1000 Main Street, PO Box 906
St. Johnsbury, VT 05819
(802) 751-2130
Rank: #7-337.-33
St. Paul's School
(Episcopal tradition)
(3)
# Students: 12
Grades: 9-12
325 Pleasant Street
Concord, NH 03301
(603) 229-4700
Rank: #7-337.-33
Stevenson School
(11)
# Students: 12
Grades: 9-12  | PK-12 (day)
3152 Forest Lake Road
Pebble Beach, CA 93953
(831) 625-8309
Rank: #29-4129.-41
The Hun School of Princeton
(1)
# Students: 13
Grades: 9-12, PG  | 6-12, PG (day)
176 Edgerstoune Road
Princeton, NJ 08540
(609) 921-7600
Rank: #29-4129.-41
Lawrence Academy
(1)
# Students: 13
Grades: 9-12
26 Powderhouse Road, P.O. Box 992
Groton, MA 01450
(978) 448-1530
Rank: #29-4129.-41
North Cross School
North Cross School Photo - Students at North Cross pursue a variety of interests, from champion athletics teams to drama, STEM to Global Studies, all set in a beautiful campus with passionate, dedicated teachers to guide them.
# Students: 13
Grades: 9-12  | PK-12 (day)
4254 Colonial Avenue
Roanoke, VA 24018
(540) 989-6641
Rank: #29-4129.-41
Phillips Academy Andover
(16)
# Students: 13
Grades: 9-12, PG
180 Main Street
Andover, MA 01810
(978) 749-4050
Rank: #29-4129.-41
# Students: 13
Grades: 6-12, PG  | PK-12, PG (day)
Via Collina d'Oro
Montagnola, Switzerland 6926
41919605151
Rank: #29-4129.-41
Worcester Academy
(1)
# Students: 13
Grades: 9-12, PG  | 6-12, PG (day)
81 Providence Street
Worcester, MA 01604
(508) 459-5481
Rank: #35-5535.-55
Baylor School
(4)
# Students: 14
Grades: 9-12  | 6-12 (day)
171 Baylor School Road
Chattanooga, TN 37405
(423) 267-5902
Rank: #35-5535.-55
The Brook Hill School
(non-denominational, conservative, evangelical, Christian tradition)
(3)
# Students: 14
Grades: 8-12  | PK-12 (day)
1051 N Houston
Bullard, TX 75757
(903) 894-5000
Rank: #35-5535.-55
Cranbrook Schools
(10)
# Students: 14
Grades: 9-12  | PK-12 (day)
PO Box 801 39221 Woodward Ave.
Bloomfield Hills, MI 48303
(248) 645-3610
Rank: #35-5535.-55
Culver Academies
(21)
# Students: 14
Grades: 9-12
1300 Academy Road
Culver, IN 46511
(574) 842-7100
Rank: #35-5535.-55
Fay School
(1)
# Students: 14
Grades: 7-9  | K-9 (day)
48 Main Street
Southborough, MA 01772
(508) 490-8201
Rank: #35-5535.-55
George School
(Quaker)
(9)
# Students: 14
Grades: 9-12
1690 Newtown Langhorne Road
Newtown, PA 18940
(215) 579-6547
Rank: #35-5535.-55
McCallie School
McCallie School Photo - The College Counseling office works with our students to help them find the best college fit for them and to make sure they are best prepared for the application and the financial aid processes.
All-Boys (Christian)
(3)
# Students: 14
Grades: 9-12, PG  | 6-12, PG (day)
500 Dodds Avenue
Chattanooga, TN 37404
(423) 624-8300
Rank: #35-5535.-55
Milton Academy
Milton Academy Photo - Milton Academy is only eight miles from Boston's museums, schools and attractions, but it has the benefits of a 130-acre New England campus-with green quads and lots of fall foliage.
(8)
# Students: 14
Grades: 9-12  | K-12 (day)
170 Centre Street
Milton, MA 02186
(617) 898-2227
Rank: #35-5535.-55
Oregon Episcopal School
(Episcopal)
# Students: 14
Grades: 9-12, PG  | PK-12, PG (day)
6300 SW Nicol Road
Portland, OR 97223
(503) 768-3115
Rank: #35-5535.-55
St. Anne's-Belfield School
(nondenominational)
# Students: 14
Grades: 9-12  | PK-12 (day)
2132 Ivy Road
Charlottesville, VA 22903
(434) 296-5106
Rank: #35-5535.-55
Western Reserve Academy
(non-sectarian)
# Students: 14
Grades: 9-12, PG
115 College Street
Hudson, OH 44236
(330) 650-9717
Rank: #35-5535.-55
# Students: 14
Grades: 7-12  | PK-12 (day)
6189 Winter Garden-Vineland Rd
Windermere, FL 34786
(407) 905-7737
Rank: #35-5535.-55
# Students: 14
Grades: 9-12, PG
201 N. Sprague Ave.
Kingston, PA 18704
(570) 270-2160
Rank: #48-7148.-71
The Athenian School
The Athenian School Photo
(1)
# Students: 15
Grades: 9-12  | 6-12 (day)
2100 Mt. Diablo Scenic Blvd.
Danville, CA 94506
(925) 362-7223
Rank: #48-7148.-71
The Bolles School
# Students: 15
Grades: 9-12, PG  | PK-12, PG (day)
7400 San Jose Blvd.
Jacksonville, FL 32217
(904) 256-5030
Rank: #48-7148.-71
Darlington School
(11)
# Students: 15
Grades: 9-12, PG  | PK-12, PG (day)
1014 Cave Spring Road, SW
Rome, GA 30161
(706) 236-0436
Rank: #48-7148.-71
Fryeburg Academy
Fryeburg Academy Photo
(1)
# Students: 15
Grades: 9-12, PG
745 Main Street
Fryeburg, ME 04037
(207) 935-2013
Rank: #48-7148.-71
Garrison Forest School
All-Girls
# Students: 15
Grades: 8-12  | PK-12 (day)
300 Garrison Forest Road
Owings Mills, MD 21117
(410) 559-3111
Rank: #48-7148.-71
# Students: 15
Grades: 9-12, PG
101 West College Blvd
Roswell, NM 88201
(800) 421-5376
Rank: #48-7148.-71
# Students: 15
Grades: 6-12  | Pre-K-12 (day)
7600 Lyons Road
Coconut Creek, FL 33073
(954) 247-0179
Rank: #48-7148.-71
Saint Andrew's School
(Episcopal tradition)
(3)
# Students: 15
Grades: 9-12
3900 Jog Road
Boca Raton, FL 33434
(561) 210-2020
Rank: #48-7148.-71
St. Mary's School
(Catholic)
# Students: 15
Grades: 6-12  | 5-12 (day)
816 Black Oak Drive
Medford, OR 97504
(541) 773-7877
Rank: #48-7148.-71
Shady Side Academy
(1)
# Students: 15
Grades: 9-12  | PK-12 (day)
423 Fox Chapel Road
Pittsburgh, PA 15238
(412) 968-3180
Rank: #48-7148.-71
# Students: 15
Grades: 9-12  | PK-12 (day)
1 Community School Drive
Sun Valley, ID 83353
(208) 622-3960
Rank: #48-7148.-71
Tallulah Falls School
(2)
# Students: 15
Grades: 7-12  | 4-12 (day)
201 Campus Drive, PO Box 10
Tallulah Falls, GA 30573
(706) 754-0400
Rank: #48-7148.-71
Trinity College School
(established in the Anglican tradition)
# Students: 15
Grades: 9-12  | 5-12 (day)
55 Deblaquire St N.
Port Hope, Canada L1A4K7
(905) 885-3209
Rank: #61-10061.-100
Branksome Hall Asia
All-Girls
# Students: >15
Grades: 6-12  | PK-12 (day)
234 Global edu-ro, Daejeong-eup, Seogwipo-si
Jeju-do, South Korea 63644
82649025000
Rank: #61-10061.-100
Brentwood College School
(1)
# Students: >15
Grades: 9-12, PG  | 8-12, PG (day)
2735 Mt. Baker Road
Mill Bay, BC V8H 1K8, Canada 1
(250) 743-5521
Rank: #61-10061.-100
Georgetown Preparatory School
All-Boys (Catholic)
(3)
# Students: >15
Grades: 9-12
10900 Rockville Pike
North Bethesda, MD 20852
(301) 214-1215
Rank: #61-10061.-100
Iolani School
(The Episcopal Church)
# Students: >15
Grades: 9-12  | K-12 (day)
563 Kamoku Street
Honolulu, HI 96826
(808) 943-2379
Rank: #61-10061.-100
Shawnigan Lake School
(2)
# Students: >15
Grades: 8-12
1975 Renfrew Road
Shawnigan Lake, BC, Canada V0R2W1
(250) 743-6207
Rank: #61-10061.-100
The Webb Schools
(29)
# Students: >15
Grades: 9-12
1175 West Baseline Road
Claremont, CA 91711
(909) 482-5214
Rank: #61-10061.-100
Ashbury College
(4)
# Students: >15
Grades: 9-12  | 4-12 (day)
362 Mariposa Avenue
Ottawa, Canada K1M 0T3
(613) 749-9630
Rank: #61-10061.-100
Chaminade College Preparatory School
Chaminade College Preparatory School Photo - Chaminade is located 20 minutes outside of Downtown St. Louis in the lovely, safe, green neighborhood of Creve Coeur. Our 55 acre campus is fun and lively throughout the school year and a wonderful place not only to study and play but also to become part of the family.
All-Boys (Catholic)
# Students: >15
Grades: 6-12
425 South Lindbergh Blvd.
St. Louis, MO 63131
(314) 692-6645
Rank: #61-10061.-100
# Students: >15
Grades: 9-12
1003 Main Street West
Hamilton, Canada L8S 4P3
(905) 572-7883
Rank: #61-10061.-100
Ridley College
(5)
# Students: >15
Grades: 6-12, PG  | PK-12, PG (day)
2 Ridley Road
St.Catharines, Canada L2R7C3
(905) 684-1889
Rank: #61-10061.-100
# Students: >15
Grades: 9-12  | PK-12 (day)
3400 Richmond Road
Victoria, Canada V8P 4P5
(250) 370-6170
Rank: #61-10061.-100
St. Stephen's Episcopal School
(Episcopal)
(1)
# Students: >15
Grades: 8-12  | 6-12 (day)
6500 St. Stephen's Drive
Austin, TX 78746
(512) 327-1213
Rank: #61-10061.-100
Branksome Hall
Branksome Hall Photo
All-Girls
# Students: >15
Grades: 7-12  | PK-12 (day)
10 Elm Avenue
Toronto, Canada m4w 1n4
(416) 920-9741
Rank: #61-10061.-100
# Students: >15
Grades: 9-12  | Pre-K-12 (day)
1 Morris Street
New York, NY 10004
(212) 232-0266
Rank: #61-10061.-100
The Village School
# Students: >15
Grades: 6-12  | PK-12 (day)
13051 Whittington Drive
Houston, TX 77077
(281) 496-7900
Rank: #61-10061.-100
Wisconsin Lutheran High School
(Wisconsin Evangelical Lutheran Synod)
(2)
# Students: >15
Grades: 9-12
330 N. Glenview Avenue
Milwaukee, WI 53213
(414) 453-4567
Rank: #61-10061.-100
St. Croix Academy
St. Croix Academy Photo - St. Croix's lakeside family-style dormitory was built in 2015 and is located on a beautiful lake with walkways to the Mississippi River and within walking distance of over 50 shops and restaurants.
(Wisconsin Evangelical Lutheran Synod (WELS) or the Evangelical Lutheran Synod (ELS))
# Students: >15
Grades: 6-12
1200 Oakdale Ave.
St. Paul, MN 55118
(651) 455-1521
Rank: #61-10061.-100
St. George's School, Vancouver
All-Boys (Anglican tradition)
# Students: >15
Grades: 8-12  | K-12 (day)
4175 West 29th Avenue
Vancouver, BC, Canada V6S1V1
(604) 221-3890

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