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
    6
    Grades: 8-12
    P.O. Box 116 , 242 Old Petersham Road
    HardwickMA 01037
    (413) 477-6000
  • 2.Rank: #2
    Hoosac School
    Hoosac School Photo - Hoosac School was founded in 1889.
    (Episcopal)
    7
    Grades: 8-12, PG
    PO Box 9
    HoosickNY 12089
    (518) 686-7331
  • 3.Rank: #3
    8
    Grades: 9-12, PG
    172 Ash Street
    WinchendonMA 01475
    (978) 297-4476
  • 4.-6.Rank: #4-6
    9
    Grades: 9-12
    Floor 2, 50/60 Station Road
    CambridgeUnited Kingdom CB1 2JH
    +44 1223 345698
  • 4.-6.Rank: #4-6
    9

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

    Grades: 7-12, PG
    2522 Grier School Road
    TyronePA 16686
    (814) 684-3000
  • 7.-17.Rank: #7-17
    10
    Grades: 9-12
    1960 Cate Mesa Road, P.O. Box 5005
    CarpinteriaCA 93013
    (805) 684-4127
  • 7.-17.Rank: #7-17
    10

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

    Grades: 9-12 | 6-12 (day)
    P.O. Box 98, 2555 W. Highway 154
    Los OlivosCA 93441
    (800) 287-9197
  • 7.-17.Rank: #7-17
    10

    Grades: 6-9
    271 Pine Nook Road, P.O. Box 7
    DeerfieldMA 01342
    (413) 774-9111
  • 7.-17.Rank: #7-17
    10

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

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

    Grades: 5-9 | Pre-K-9 (day)
    P.O. Box 68 528 Pomfret Street
    PomfretCT 06258
    (860) 928-1328
  • 7.-17.Rank: #7-17
    10

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

    Grades: 9-12
    P.O. Box 1910
    NewportRI 02840
    (401) 842-6600
  • 7.-17.Rank: #7-17
    10

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

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

    Grades: 8-12
    500 Christ School Road
    AshevilleNC 28704
    (828) 684-6232
  • 18.-32.Rank: #18-32
    11

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

    Grades: 8-12
    282 Farmers Row, Box 991
    GrotonMA 01450
    (978) 448-7510
  • 18.-32.Rank: #18-32
    11

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

    Grades: 9-12, PG
    64 Main Street
    MeridenNH 03770
    (603) 469-2100
  • 18.-32.Rank: #18-32
    11

    Grades: 6-12, PG
    66 School Street
    GranbyMA 01033
    (413) 255-0000
  • 18.-32.Rank: #18-32
    11

    Grades: 7-12, PG
    320 Iwo Jima Blvd
    HarlingenTX 78550
  • 18.-32.Rank: #18-32
    11

    Grades: 9-12, PG
    70 Main Street
    New HamptonNH 03256
    (603) 677-3401
  • 18.-32.Rank: #18-32
    11

    Grades: 6-12, PG
    200 Seminary Street
    PennsburgPA 18073
    (215) 679-9511
  • 18.-32.Rank: #18-32
    11

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

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

    Grades: 9-12
    1500 Mark Thomas Drive
    MontereyCA 93940
    (831) 655-9356
  • 18.-32.Rank: #18-32
    11

    Grades: 9-12
    5025 Thacher Road
    OjaiCA 93023
    (805) 640-3210
  • 18.-32.Rank: #18-32
    11

    Grades: 7-12
    1001 Eagle Road
    WaynePA 19087
    (610) 989-1200
  • 33.-72.Rank: #33-72
    12
    Grades: 9-12
    827 N. Tacoma Avenue
    TacomaWA 98403
    (253) 284-8601
  • 33.-72.Rank: #33-72
    12

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

    Grades: 9-12
    1160 Great Pond Road
    North AndoverMA 01845
    (978) 725-6272
  • 33.-72.Rank: #33-72
    12

    Grades: 8-12, PG | Pre-K-12, PG (day)
    300 Calverton School Rd
    HuntingtownMD 20639
    (410) 535-0216
  • 33.-72.Rank: #33-72
    12

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

    Grades: 9-12, PG
    101 Aspetuck Avenue
    New MilfordCT 06776
    (860) 210-3832
  • 33.-72.Rank: #33-72
    12

    Grades: 6-9
    62 Alumni Drive
    CanaanNH 03741
    (603) 523-3548
  • 33.-72.Rank: #33-72
    12

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

    Grades: 9-12
    49 Seahorse Lane
    ChristchurchVA 23031
    (804) 758-2306
  • 33.-72.Rank: #33-72
    12

    Grades: 9-12
    166 Main Street
    ConcordMA 01742
    (978) 402-2250
  • 33.-72.Rank: #33-72
    12

    Grades: 9-12, PG
    39 School Street
    AshburnhamMA 01430
    (978) 827-7300
  • 33.-72.Rank: #33-72
    12

    Grades: 9-11
    1539 E Howard St.
    PasadenaCA 91104
    (914) 495-6056
  • 33.-72.Rank: #33-72
    12

    Grades: 7-12, PG | 6-12, PG (day)
    230 Bushy Hill Road
    SimsburyCT 06070
    (860) 408-4200
  • 33.-72.Rank: #33-72
    12

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

    Grades: 7-12, PG
    P.O. 278, 4744 James Madison Hwy
    Fork UnionVA 23055
    (800) 462-3862
  • 33.-72.Rank: #33-72
    12

    Grades: 9-12
    6155 Fountain Valley School Road
    Colorado SpringsCO 80911
    (719) 391-5251
  • 33.-72.Rank: #33-72
    12

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

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

    Grades: 9-12, PG
    PO Box 1879
    PlymouthNH 03264
    (603) 536-1747
  • 33.-72.Rank: #33-72
    12

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

    Grades: 9-12, PG
    8328 Georgetown Pike
    McLeanVA 22102-1200
    (703) 556-8273
  • 33.-72.Rank: #33-72
    12

    Grades: 6-12, PG
    295 Main Street
    PittsfieldME 04967
    (207) 487-2282
  • 33.-72.Rank: #33-72
    12

    Grades: 9-12, PG
    26 Chase Road
    ThompsonCT 06277
    (860) 923-9245
  • 33.-72.Rank: #33-72
    12

    Grades: 9-12
    60 Main Street
    FarmingtonCT 06032
    (860) 409-3530
  • 33.-72.Rank: #33-72
    12

    Grades: 3-12 | Pre-K-12 (day)
    723 El Paseo Road
    OjaiCA 93023
    (805) 646-1423
  • 33.-72.Rank: #33-72
    12

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

    Grades: 9-12, PG
    204 Main Street - P.O. Box 500
    AndoverNH 03216
    (603) 735-6652
  • 33.-72.Rank: #33-72
    12

    Grades: 9-12, PG
    418 Houghton Brook Road
    PutneyVT 05346
    (802) 387-6201
  • 33.-72.Rank: #33-72
    12

    Grades: 6-12
    2001 Riverside Drive
    GainesvilleGA 30501
    (877) 692-2338
  • 33.-72.Rank: #33-72
    12

    Grades: 5-9 | K-9 (day)
    201 Romford Rd.
    WashingtonCT 06794
  • 33.-72.Rank: #33-72
    12

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

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

    Grades: 9-12, PG
    251 Canaan Road
    SalisburyCT 06068
    (860) 435-5732
  • 33.-72.Rank: #33-72
    12

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

    Grades: 9-12, PG
    30 School Street
    TiltonNH 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
    PawlingNY 12564
    (845) 855-4825
  • 33.-72.Rank: #33-72
    12

    Grades: 9-12
    12096 N. Ventura Ave
    OjaiCA 93023
    (805) 646-1464
  • 33.-72.Rank: #33-72
    12

    Grades: 9-12
    400 VES Road
    LynchburgVA 24503
    (434) 385-3607
  • 33.-72.Rank: #33-72
    12

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

    Grades: 9-12, PG
    995 Hopmeadow Street
    SimsburyCT 06070
    (860) 408-3060
  • 73.-83.Rank: #73-83
    13
    Grades: 9-12
    360 Asheville School Rd.
    AshevilleNC 28806
    (828) 254-6345
  • 73.-83.Rank: #73-83
    13

    Grades: 9-12, PG
    52500 Temecula Road
    IdyllwildCA 92549
    (951) 468-7223
  • 73.-83.Rank: #73-83
    13

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

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

    Grades: 9-12
    900 Hillsborough Street
    RaleighNC 27603
    (919) 424-4100
  • 73.-83.Rank: #73-83
    13

    Grades: 9-12, PG
    Via Aventina 3
    RomeItaly 00153
    +39 06 575 0605
  • 73.-83.Rank: #73-83
    13

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

    Grades: 9-12, PG
    PO Box 190, 66 Cutler Road
    East MachiasME 04630
    (207) 255-8301
  • 73.-83.Rank: #73-83
    13

    Grades: 7-12 | 6-12 (day)
    319 Webb Road East
    Bell BuckleTN 37020
    (931) 389-6003
  • 73.-83.Rank: #73-83
    13

    Grades: 9-12, PG | 7-12, PG (day)
    19 Payson Avenue
    EasthamptonMA 01027
    (413) 529-3241
  • 73.-83.Rank: #73-83
    13

    Grades: 9-12 | 6-12 (day)
    302 Portola Road
    Portola ValleyCA 94028
    (650) 851-8223
  • 84.-86.Rank: #84-86
    14
    Grades: 9-12, PG
    45 Georgian Road
    WestonMA 02493
    (781) 642-8650
  • 84.-86.Rank: #84-86
    14

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

    Grades: 9-12
    22520 Mount Michael Road
    ElkhornNE 68022
    (402) 238-1457
  • 87.-97.Rank: #87-97
    15
    Grades: 7-12
    2605 Carlsbad Blvd.
    CarlsbadCA 92008
    (888) 762-2338
  • 87.-97.Rank: #87-97
    15

    Grades: 7-12
    80 chemin Moulton Hill
    Sherbrooke, QuebecCanada J1M 1Z8
    (819) 566-0238
  • 87.-97.Rank: #87-97
    15

    Grades: 9-12, PG | K-12, PG (day)
    65-1692 Kohala Mountain Road
    KamuelaHI 96743
    (808) 881-4321
  • 87.-97.Rank: #87-97
    15

    Grades: 9-12
    4391 County Rd. 29
    LakefieldCanada K0L2H0
    (705) 652-3324
  • 87.-97.Rank: #87-97
    15

    Grades: 9-12
    1000 Green St.
    AtchisonKS 66002
    (913) 367-5482
  • 87.-97.Rank: #87-97
    15

    Grades: 8-12 | 6-12 (day)
    290 Quintard Rd.
    SewaneeTN 37375
    (931) 598-5651
  • 87.-97.Rank: #87-97
    15

    Grades: 7-12
    1600 St. Bernard Drive, S.E.
    CullmanAL 35055
    (256) 255-5890
  • 87.-97.Rank: #87-97
    15

    Grades: 6-12 | K-12 (day)
    2801 Ranch Road 12
    San MarcosTX 78666
    (800) 428-5120
  • 87.-97.Rank: #87-97
    15

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

    Grades: 9-12 | Pre-K-12 (day)
    975 Westtown Rd
    West ChesterPA 19382
    (610) 399-7900
  • 87.-97.Rank: #87-97
    15

    Grades: 9-12 | K-12 (day)
    101 School House Lane
    WilliamsburgVA 23188
    (757) 378-5263
  • 98.-106.Rank: #98-106
    >15
    Grades: 6-12
    40 College Hill Road
    Rothesay, New BrunswickCanada E2E 5H1
    (506) 847-8224
  • 98.-106.Rank: #98-106
    >15

    Grades: 9-12, PG
    12 Highland Street
    NatickMA 01760
    (508) 650-5020
  • 98.-106.Rank: #98-106
    >15

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