Smallest Average Class Size

All Schools
All Schools 
400+ students
400+ students 
200-400 students
200-400 students 
< 200 students
< 200 students 
More
Among "Schools with 200-400 Students", view the boarding schools with the smallest average class sizes (2021-22).
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 Size (2021-22)

Among Schools with 200-400 Students (out of 106 schools)

Sorted by range (alphabetically within range)
  • Boarding School # Students Grades Location
  • 1.Rank: #1
    Eagle Hill School
    Eagle Hill School Photo - At Eagle Hill School we are pioneers, ready to explore with a sense of wonder and possibilities each day.
    (2)
    6
    Grades: 8-12
    P.O. Box 116 , 242 Old Petersham Road
    Hardwick, MA 01037
    (413) 477-6000
  • 2.Rank: #2
    Hoosac School
    Hoosac School Photo - Hoosac School was founded in 1889.
    (Episcopal)
    (1)
    7
    Grades: 8-12, PG
    PO Box 9
    Hoosick, NY 12089
    (518) 686-7331
  • 3.Rank: #3
    The Winchendon School
    (2)
    8
    Grades: 9-12, PG
    172 Ash Street
    Winchendon, MA 01475
    (978) 297-4476
  • 4.-6.Rank: #4-6
    CATS Colleges
    9
    Grades: 9-12
    Floor 2, 50/60 Station Road
    Cambridge, United Kingdom CB1 2JH
    +44 1223 345698
  • 4.-6.Rank: #4-6
    Forman School
    Forman School Photo - The Forman Green is at the center of campus life. Surrounded by dorms and faculty homes, it reflects the traditional charm of an historic New England community.
    (6)
    9

    Grades: 9-12, PG
    12 Norfolk Road, P.O. Box 80
    Litchfield, CT 06759
    (860) 567-1802
  • 4.-6.Rank: #4-6
    Grier School
    All-Girls 
    (6)
    9

    Grades: 7-12, PG
    2522 Grier School Road
    Tyrone, PA 16686
    (814) 684-3000
  • 7.-17.Rank: #7-17
    Cate School
    (19)
    10
    Grades: 9-12
    1960 Cate Mesa Road, P.O. Box 5005
    Carpinteria, CA 93013
    (805) 684-4127
  • 7.-17.Rank: #7-17
    Cheshire Academy
    (5)
    10

    Grades: 9-12, PG
    10 Main Street
    Cheshire, CT 06410
    (203) 439-7250
  • 7.-17.Rank: #7-17
    Dunn School
    10

    Grades: 9-12 | 6-12 (day)
    P.O. Box 98, 2555 W. Highway 154
    Los Olivos, CA 93441
    (800) 287-9197
  • 7.-17.Rank: #7-17
    Eaglebrook School
    All-Boys 
    (1)
    10

    Grades: 6-9
    271 Pine Nook Road, P.O. Box 7
    Deerfield, MA 01342
    (413) 774-9111
  • 7.-17.Rank: #7-17
    Leysin American School in Switzerland (LAS)
    Leysin American School in Switzerland (LAS) Photo
    10

    Grades: 7-12, PG
    Chemin de la Source 3
    Leysin, Switzerland 1854
    0041244934888
  • 7.-17.Rank: #7-17
    Randolph-Macon Academy
    (United Methodist)
    (4)
    10

    Grades: 6-12, PG
    200 Academy Drive
    Front Royal, VA 22630
    (540) 636-5484
  • 7.-17.Rank: #7-17
    Rectory School
    (2)
    10

    Grades: 5-9 | Pre-K-9 (day)
    P.O. Box 68 528 Pomfret Street
    Pomfret, CT 06258
    (860) 928-1328
  • 7.-17.Rank: #7-17
    St. Andrew's School
    (1)
    10

    Grades: 9-12, PG | 6-12, PG (day)
    63 Federal Road
    Barrington, RI 02806
    (401) 246-1230
  • 7.-17.Rank: #7-17
    St. George's School
    (Episcopal)
    (1)
    10

    Grades: 9-12
    P.O. Box 1910
    Newport, RI 02840
    (401) 842-6600
  • 7.-17.Rank: #7-17
    Solebury School
    (4)
    10

    Grades: 9-12, PG
    6832 Phillips Mill Road
    New Hope, PA 18938
    (215) 862-5261
  • 7.-17.Rank: #7-17
    Vermont Academy
    (2)
    10

    Grades: 9-12, PG
    10 Long Walk
    Saxtons River, VT 05154
    (802) 869-6229
  • 18.-32.Rank: #18-32
    Brewster Academy
    (10)
    11
    Grades: 9-12, PG
    80 Academy Drive
    Wolfeboro, NH 03894
    (603) 569-7200
  • 18.-32.Rank: #18-32
    Christ School
    All-Boys  (Episcopal)
    (1)
    11

    Grades: 8-12
    500 Christ School Road
    Asheville, NC 28704
    (828) 684-6232
  • 18.-32.Rank: #18-32
    Gould Academy
    (2)
    11

    Grades: 9-12, PG
    PO Box 860
    Bethel, ME 04217
    (207) 824-7777
  • 18.-32.Rank: #18-32
    Groton School
    (Episcopal)
    (19)
    11

    Grades: 8-12
    282 Farmers Row, Box 991
    Groton, MA 01450
    (978) 448-7510
  • 18.-32.Rank: #18-32
    Kents Hill School
    Kents Hill School Photo - Our idyllic, 400-acre campus is nestled in the midst of the Belgrade Lakes and provides sweeping views of the mountains of Maine and New Hampshire.
    (1)
    11

    Grades: 9-12, PG
    PO Box 257, 1614 Main St., Rte. 17
    Kents Hill, ME 04349
    (207) 685-1606
  • 18.-32.Rank: #18-32
    Kimball Union Academy
    (5)
    11

    Grades: 9-12, PG
    64 Main Street
    Meriden, NH 03770
    (603) 469-2100
  • 18.-32.Rank: #18-32
    The MacDuffie School
    (1)
    11

    Grades: 6-12, PG
    66 School Street
    Granby, MA 01033
    (413) 255-0000
  • 18.-32.Rank: #18-32
    Marine Military Academy
    All-Boys 
    11

    Grades: 7-12, PG
    320 Iwo Jima Blvd
    Harlingen, TX 78550
  • 18.-32.Rank: #18-32
    New Hampton School
    (8)
    11

    Grades: 9-12, PG
    70 Main Street
    New Hampton, NH 03256
    (603) 677-3401
  • 18.-32.Rank: #18-32
    Perkiomen School
    Perkiomen School Photo - Innovation Center
    (5)
    11

    Grades: 6-12, PG
    200 Seminary Street
    Pennsburg, PA 18073
    (215) 679-9511
  • 18.-32.Rank: #18-32
    Ross School
    Ross School Photo
    11

    Grades: 6-12, PG | K-12, PG (day)
    18 Goodfriend Drive
    East Hampton, NY 11937
    (631) 907-5400
  • 18.-32.Rank: #18-32
    Saint James School
    (Episcopal)
    11

    Grades: 8-12
    17641 College Road
    Hagerstown, MD 21740
    (301) 733-9330
  • 18.-32.Rank: #18-32
    Santa Catalina School
    All-Girls  (Catholic)
    (1)
    11

    Grades: 9-12
    1500 Mark Thomas Drive
    Monterey, CA 93940
    (831) 655-9356
  • 18.-32.Rank: #18-32
    The Thacher School
    (26)
    11

    Grades: 9-12
    5025 Thacher Road
    Ojai, CA 93023
    (805) 640-3210
  • 18.-32.Rank: #18-32
    Valley Forge Military Academy
    All-Boys 
    (2)
    11

    Grades: 7-12
    1001 Eagle Road
    Wayne, PA 19087
    (610) 989-1200
  • 33.-72.Rank: #33-72
    Annie Wright Schools
    (4)
    12
    Grades: 9-12
    827 N. Tacoma Avenue
    Tacoma, WA 98403
    (253) 284-8601
  • 33.-72.Rank: #33-72
    Applewild School
    12

    Grades: 5-9 | Pre-K-9 (day)
    120 Prospect Street
    Fitchburg, MA 01420
    (978) 342-6053
  • 33.-72.Rank: #33-72
    Brooks School
    (Episcopal)
    (10)
    12

    Grades: 9-12
    1160 Great Pond Road
    North Andover, MA 01845
    (978) 725-6272
  • 33.-72.Rank: #33-72
    The Calverton School
    The Calverton School Photo - Friendships are made across divisions at Calverton.
    12

    Grades: 8-12, PG | Pre-K-12, PG (day)
    300 Calverton School Rd
    Huntingtown, MD 20639
    (410) 535-0216
  • 33.-72.Rank: #33-72
    Camden Military Academy
    All-Boys 
    (18)
    12

    Grades: 7-12, PG
    520 Hwy. 1 North
    Camden, SC 29020
    (800) 948-6291
  • 33.-72.Rank: #33-72
    Canterbury School
    (Catholic)
    (1)
    12

    Grades: 9-12, PG
    101 Aspetuck Avenue
    New Milford, CT 06776
    (860) 210-3832
  • 33.-72.Rank: #33-72
    Cardigan Mountain School
    All-Boys 
    (2)
    12

    Grades: 6-9
    62 Alumni Drive
    Canaan, NH 03741
    (603) 523-3548
  • 33.-72.Rank: #33-72
    CATS Academy Boston
    (1)
    12

    Grades: 9-12
    2001 Washington Street
    Braintree, MA 02184
    (857) 400-9700
  • 33.-72.Rank: #33-72
    Christchurch School
    (Episcopal)
    12

    Grades: 9-12
    49 Seahorse Lane
    Christchurch, VA 23031
    (804) 758-2306
  • 33.-72.Rank: #33-72
    Concord Academy
    (9)
    12

    Grades: 9-12
    166 Main Street
    Concord, MA 01742
    (978) 402-2250
  • 33.-72.Rank: #33-72
    Cushing Academy
    (2)
    12

    Grades: 9-12, PG
    39 School Street
    Ashburnham, MA 01430
    (978) 827-7300
  • 33.-72.Rank: #33-72
    EF Academy Pasadena
    12

    Grades: 9-11
    1539 E Howard St.
    Pasadena, CA 91104
    (914) 495-6056
  • 33.-72.Rank: #33-72
    The Ethel Walker School
    All-Girls 
    12

    Grades: 7-12, PG | 6-12, PG (day)
    230 Bushy Hill Road
    Simsbury, CT 06070
    (860) 408-4200
  • 33.-72.Rank: #33-72
    Forest Ridge School of the Sacred Heart
    All-Girls  (Catholic)
    12

    Grades: 8-12 | 5-12 (day)
    4800 139th Avenue SE
    Bellevue, WA 98006
    (425) 641-0700
  • 33.-72.Rank: #33-72
    Fork Union Military Academy
    All-Boys  (Baptist)
    (6)
    12

    Grades: 7-12, PG
    P.O. 278, 4744 James Madison Hwy
    Fork Union, VA 23055
    (800) 462-3862
  • 33.-72.Rank: #33-72
    Fountain Valley School of Colorado
    (4)
    12

    Grades: 9-12
    6155 Fountain Valley School Road
    Colorado Springs, CO 80911
    (719) 391-5251
  • 33.-72.Rank: #33-72
    The Frederick Gunn School
    12

    Grades: 9-12, PG
    99 Green Hill Road
    Washington, CT 06793
    (860) 868-7334
  • 33.-72.Rank: #33-72
    Hebron Academy
    (9)
    12

    Grades: 6-12, PG
    339 Paris Road PO Box 309
    Hebron, ME 04238
    (207) 966-5225
  • 33.-72.Rank: #33-72
    Holderness School
    (Episcopal)
    (8)
    12

    Grades: 9-12, PG
    PO Box 1879
    Plymouth, NH 03264
    (603) 536-1747
  • 33.-72.Rank: #33-72
    Indian Mountain School
    Indian Mountain School Photo - As one of the most popular spring sports at IMS, the varsity boys and girls programs have sent athletes to compete at the highest levels of high school and college.
    12

    Grades: 5-9 | Pre-K-9 (day)
    211 Indian Mountain Road
    Lakeville, CT 06039
    (435) 480-0871
  • 33.-72.Rank: #33-72
    The Madeira School
    All-Girls 
    (2)
    12

    Grades: 9-12, PG
    8328 Georgetown Pike
    McLean, VA 22102-1200
    (703) 556-8273
  • 33.-72.Rank: #33-72
    Maine Central Institute
    12

    Grades: 6-12, PG
    295 Main Street
    Pittsfield, ME 04967
    (207) 487-2282
  • 33.-72.Rank: #33-72
    Marianapolis Preparatory School
    (Catholic)
    12

    Grades: 9-12, PG
    26 Chase Road
    Thompson, CT 06277
    (860) 923-9245
  • 33.-72.Rank: #33-72
    Miss Porter's School
    All-Girls 
    (5)
    12

    Grades: 9-12
    60 Main Street
    Farmington, CT 06032
    (860) 409-3530
  • 33.-72.Rank: #33-72
    Ojai Valley School
    (2)
    12

    Grades: 3-12 | Pre-K-12 (day)
    723 El Paseo Road
    Ojai, CA 93023
    (805) 646-1423
  • 33.-72.Rank: #33-72
    Pomfret School
    (8)
    12

    Grades: 9-12, PG
    PO Box 128, 398 Pomfret Street
    Pomfret, CT 06258
    (860) 963-6120
  • 33.-72.Rank: #33-72
    Proctor Academy
    (12)
    12

    Grades: 9-12, PG
    204 Main Street - P.O. Box 500
    Andover, NH 03216
    (603) 735-6652
  • 33.-72.Rank: #33-72
    The Putney School
    (14)
    12

    Grades: 9-12, PG
    418 Houghton Brook Road
    Putney, VT 05346
    (802) 387-6201
  • 33.-72.Rank: #33-72
    Riverside Military Academy
    All-Boys 
    (5)
    12

    Grades: 6-12
    2001 Riverside Drive
    Gainesville, GA 30501
    (877) 692-2338
  • 33.-72.Rank: #33-72
    Rumsey Hall School
    12

    Grades: 5-9 | K-9 (day)
    201 Romford Rd.
    Washington, CT 06794
  • 33.-72.Rank: #33-72
    St. Andrew's School, DE
    St. Andrew's School, DE Photo - St. Andrew's seminar style discussions, which include faculty and students seated at a central round table, are heard throughout English, history and language classes.
    (Episcopal)
    (13)
    12

    Grades: 9-12
    350 Noxontown Road
    Middletown, DE 19709
    (302) 285-4231
  • 33.-72.Rank: #33-72
    St. Mark's School
    (Episcopal)
    (7)
    12

    Grades: 9-12
    25 Marlboro Road
    Southborough, MA 01772
    (508) 786-6118
  • 33.-72.Rank: #33-72
    Salisbury School
    All-Boys 
    (2)
    12

    Grades: 9-12, PG
    251 Canaan Road
    Salisbury, CT 06068
    (860) 435-5732
  • 33.-72.Rank: #33-72
    Taejon Christian International School
    12

    Grades: 6-12 | Pre-K-12 (day)
    77 Yongsan 2-ro, Yuseong Gu
    Daejeon, South Korea 34035
    82426209116
  • 33.-72.Rank: #33-72
    Tilton School
    (1)
    12

    Grades: 9-12, PG
    30 School Street
    Tilton, NH 03276
    (603) 286-1733
  • 33.-72.Rank: #33-72
    Trinity-Pawling School
    All-Boys  (Episcopal)
    12

    Grades: 8-12, PG | 7-12, PG (day)
    700 Route 22
    Pawling, NY 12564
    (845) 855-4825
  • 33.-72.Rank: #33-72
    Villanova Preparatory School
    (Catholic)
    (1)
    12

    Grades: 9-12
    12096 N. Ventura Ave
    Ojai, CA 93023
    (805) 646-1464
  • 33.-72.Rank: #33-72
    Virginia Episcopal School
    Virginia Episcopal School Photo - Jett Hall is our main building on the VES campus. This original building, constructed in 1916, is where we welcome guests to campus. It houses our administration, Admissions, Development, Marketing and Business offices, holds classrooms and our Day Student Lounge.
    (Episcopal)
    (7)
    12

    Grades: 9-12
    400 VES Road
    Lynchburg, VA 24503
    (434) 385-3607
  • 33.-72.Rank: #33-72
    Wasatch Academy
    (4)
    12

    Grades: 8-12, PG
    120 South 100 West
    Mt. Pleasant, UT 84647
    (435) 462-1400
  • 33.-72.Rank: #33-72
    Westminster School
    (10)
    12

    Grades: 9-12, PG
    995 Hopmeadow Street
    Simsbury, CT 06070
    (860) 408-3060
  • 73.-83.Rank: #73-83
    Asheville School
    (4)
    13
    Grades: 9-12
    360 Asheville School Rd.
    Asheville, NC 28806
    (828) 254-6345
  • 73.-83.Rank: #73-83
    Idyllwild Arts Academy
    (17)
    13

    Grades: 9-12, PG
    52500 Temecula Road
    Idyllwild, CA 92549
    (951) 468-7223
  • 73.-83.Rank: #73-83
    Millbrook School
    (4)
    13

    Grades: 9-12, PG
    131 Millbrook School Road
    Millbrook, NY 12545
    (845) 677-8261
  • 73.-83.Rank: #73-83
    Portsmouth Abbey School
    (Catholic)
    (5)
    13

    Grades: 9-12
    285 Cory's Lane
    Portsmouth, RI 02871
    (401) 643-1248
  • 73.-83.Rank: #73-83
    Saint Mary's School
    All-Girls  (Episcopal)
    (1)
    13

    Grades: 9-12
    900 Hillsborough Street
    Raleigh, NC 27603
    (919) 424-4100
  • 73.-83.Rank: #73-83
    St. Stephen's School
    13

    Grades: 9-12, PG
    Via Aventina 3
    Rome, Italy 00153
    +39 06 575 0605
  • 73.-83.Rank: #73-83
    Stanstead College
    (2)
    13

    Grades: 7-12, PG
    450 Dufferein
    Stanstead, Canada 05830
    (819) 876-2223
  • 73.-83.Rank: #73-83
    Washington Academy
    13

    Grades: 9-12, PG
    PO Box 190, 66 Cutler Road
    East Machias, ME 04630
    (207) 255-8301
  • 73.-83.Rank: #73-83
    The Webb School
    (10)
    13

    Grades: 7-12 | 6-12 (day)
    319 Webb Road East
    Bell Buckle, TN 37020
    (931) 389-6003
  • 73.-83.Rank: #73-83
    The Williston Northampton School
    (17)
    13

    Grades: 9-12, PG | 7-12, PG (day)
    19 Payson Avenue
    Easthampton, MA 01027
    (413) 529-3241
  • 73.-83.Rank: #73-83
    Woodside Priory School (Priory)
    (Catholic)
    (2)
    13

    Grades: 9-12 | 6-12 (day)
    302 Portola Road
    Portola Valley, CA 94028
    (650) 851-8223
  • 84.-86.Rank: #84-86
    The Cambridge School of Weston
    (15)
    14
    Grades: 9-12, PG
    45 Georgian Road
    Weston, MA 02493
    (781) 642-8650
  • 84.-86.Rank: #84-86
    Missouri Military Academy
    All-Boys 
    (6)
    14

    Grades: 7-12, PG
    204 Grand Street
    Mexico, MO 65265
    (573) 581-1776
  • 84.-86.Rank: #84-86
    Mount Michael Benedictine School
    All-Boys  (Catholic)
    14

    Grades: 9-12
    22520 Mount Michael Road
    Elkhorn, NE 68022
    (402) 238-1457
  • 87.-97.Rank: #87-97
    Army and Navy Academy
    All-Boys 
    (4)
    15
    Grades: 7-12
    2605 Carlsbad Blvd.
    Carlsbad, CA 92008
    (888) 762-2338
  • 87.-97.Rank: #87-97
    Bishop's College School
    15

    Grades: 7-12
    80 chemin Moulton Hill
    Sherbrooke, Quebec, Canada J1M 1Z8
    (819) 566-0238
  • 87.-97.Rank: #87-97
    Hawai'i Preparatory Academy
    (4)
    15

    Grades: 9-12, PG | K-12, PG (day)
    65-1692 Kohala Mountain Road
    Kamuela, HI 96743
    (808) 881-4321
  • 87.-97.Rank: #87-97
    Lakefield College School
    (Anglican)
    (4)
    15

    Grades: 9-12
    4391 County Rd. 29
    Lakefield, Canada K0L2H0
    (705) 652-3324
  • 87.-97.Rank: #87-97
    Maur Hill - Mount Academy (MH-MA)
    Maur Hill - Mount Academy (MH-MA) Photo
    (Catholic)
    15

    Grades: 9-12
    1000 Green St.
    Atchison, KS 66002
    (913) 367-5482
  • 87.-97.Rank: #87-97
    St. Andrew's-Sewanee School
    (Episcopal)
    (6)
    15

    Grades: 8-12 | 6-12 (day)
    290 Quintard Rd.
    Sewanee, TN 37375
    (931) 598-5651
  • 87.-97.Rank: #87-97
    St. Bernard Preparatory School
    (Catholic)
    15

    Grades: 7-12
    1600 St. Bernard Drive, S.E.
    Cullman, AL 35055
    (256) 255-5890
  • 87.-97.Rank: #87-97
    San Marcos Academy
    (Baptist)
    15

    Grades: 6-12 | K-12 (day)
    2801 Ranch Road 12
    San Marcos, TX 78666
    (800) 428-5120
  • 87.-97.Rank: #87-97
    TASIS The American School in England
    15

    Grades: 8-12, PG | Pre-K-12, PG (day)
    Coldharbour Lane
    Thorpe, Surrey TW20 8TE, United Kingdom tw20 8te
    441932565252
  • 87.-97.Rank: #87-97
    Westtown School
    Westtown School Photo - Main building
    (Society of Friends)
    (44)
    15

    Grades: 9-12 | Pre-K-12 (day)
    975 Westtown Rd
    West Chester, PA 19382
    (610) 399-7900
  • 87.-97.Rank: #87-97
    Williamsburg Christian Academy
    15

    Grades: 9-12 | K-12 (day)
    101 School House Lane
    Williamsburg, VA 23188
    (757) 378-5263
  • 98.-106.Rank: #98-106
    Rothesay Netherwood School
    >15
    Grades: 6-12
    40 College Hill Road
    Rothesay, New Brunswick, Canada E2E 5H1
    (506) 847-8224
  • 98.-106.Rank: #98-106
    Walnut Hill School for the Arts
    (3)
    >15

    Grades: 9-12, PG
    12 Highland Street
    Natick, MA 01760
    (508) 650-5020
  • 98.-106.Rank: #98-106
    Admiral Farragut Academy
    (8)
    >15

    Grades: 8-12 | K-12 (day)
    501 Park Street North
    St. Petersburg, FL 33710
    (727) 384-5504
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