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 400+ Students", view the boarding schools with the smallest average class sizes (2019-20).
  • 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 (2019-20)

Among Schools with 400+ Students (out of 110 schools)

Sorted by range (alphabetically within range)
  • Boarding School # Students Grades Location
  • 1.Rank: #1
    8
    Grades: 9-12 | 2-12 (day)
    P.O. Box 227
    Prides CrossingMA 01965
    (978)236-3000
  • 2.Rank: #2
    9
    Grades: 9-12, PG
    Suffield Academy
    SuffieldCT 06078
    (860)386-4440
  • 3.-9.Rank: #3-9
    11
    Grades: 9-12, PG
    500 Old Farms Road
    AvonCT 06001
    (800)464-2866
  • 3.-9.Rank: #3-9
    11

    Grades: 9-12
    1200 N. Quaker Lane
    AlexandriaVA 22302
    (877)933-4347
  • 3.-9.Rank: #3-9
    11

    Grades: 9-12
    1 Elm Street
    ByfieldMA 01922
    (978)499-3120
  • 3.-9.Rank: #3-9
    11

    Grades: 9-12, PG
    100 Academy Drive
    MercersburgPA 17236
    (717)328-6173
  • 3.-9.Rank: #3-9
    11

    Grades: 8-12 | Pre-K-12 (day)
    4254 Colonial Avenue
    RoanokeVA 24018
    (540)989-6641
  • 3.-9.Rank: #3-9
    11

    Grades: 9-12, PG
    One Lamplighter Way
    Mount HermonMA 01354
    (413)498-3227
  • 3.-9.Rank: #3-9
    11

    Grades: 9-12, PG
    110 Woodbury Road
    WatertownCT 06795
    (860)945-7700
  • 10.-31.Rank: #10-31
    12
    Grades: 9-12, PG
    245 North Undermountain Road
    SheffieldMA 01257
    (413)229-1003
  • 10.-31.Rank: #10-31
    12

    Grades: 9-12, PG
    PO Box 600
    BlairstownNJ 07825
    (908)362-6121
  • 10.-31.Rank: #10-31
    12

    Grades: 9-12, PG
    333 Christian Street
    WallingfordCT 06492
    (203)697-2239
  • 10.-31.Rank: #10-31
    Dana Hall School
    Dana Hall School Photo - Experimentation. Exploration. Creativity. Dana Hall`s visual artists are sensitive observers of themselves and the world around them.
    All-Girls 
    12

    Grades: 9-12 | 5-12 (day)
    45 Dana Road
    WellesleyMA 02482
    (781)489-1331
  • 10.-31.Rank: #10-31
    12

    Grades: 9-12, PG
    7 Boyden Lane
    DeerfieldMA 01342
    (413)774-1400
  • 10.-31.Rank: #10-31
    12

    Grades: 9-12, PG
    975 West Main Street
    Dover FoxcroftME 04426
    (207)564-8664
  • 10.-31.Rank: #10-31
    12

    Grades: 9-12, PG
    860 Beech Street
    PottstownPA 19464
    (610)326-1000
  • 10.-31.Rank: #10-31
    12

    Grades: 9-12, PG
    11 Interlaken Road
    LakevilleCT 06039
    (860)435-3102
  • 10.-31.Rank: #10-31
    Kent School
    Kent School Photo - Our campus is located along the shores of the Housatonic River, adjacent to the town of Kent.
    (Episcopal)
    12

    Grades: 9-12, PG
    PO Box 2006
    KentCT 06757
    (860)927-6111
  • 10.-31.Rank: #10-31
    12

    Grades: 9-12, PG
    1500 West Kennedy Road
    Lake ForestIL 60045
    (847)615-3267
  • 10.-31.Rank: #10-31
    12

    Grades: 9-12, PG
    2500 Main Street
    LawrencevilleNJ 08648
    (800)735-2030
  • 10.-31.Rank: #10-31
    12

    Grades: 9-12, PG
    Office of Admission
    WindsorCT 06095
    (860)687-6400
  • 10.-31.Rank: #10-31
    12

    Grades: 9-12
    PO Box 127, 168 Institute Circle
    Lyndon CenterVT 05850
    (802)535-3700
  • 10.-31.Rank: #10-31
    12

    Grades: 9-12, PG
    295 Main Street
    PittsfieldME 04967
    (207)487-2282
  • 10.-31.Rank: #10-31
    12

    Grades: 9-12
    1400 Lowell Road
    ConcordMA 01742
    (978)371-6524
  • 10.-31.Rank: #10-31
    12

    Grades: 9-12, PG
    201 South Main Street
    HightstownNJ 08520
    (609)944-7501
  • 10.-31.Rank: #10-31
    12

    Grades: 9-12, PG
    20 Main Street
    ExeterNH 03833
    (603)777-3437
  • 10.-31.Rank: #10-31
    12

    Grades: 7-12
    2001 Riverside Drive
    GainesvilleGA 30501
    (800)462-2338
  • 10.-31.Rank: #10-31
    12

    Grades: 9-12, PG
    1000 Main Street, PO Box 906
    St. JohnsburyVT 05819
    (802)751-2130
  • 10.-31.Rank: #10-31
    St. Paul's School
    St. Paul's School Photo - SPS 1
    (Episcopal)
    12

    Grades: 9-12
    325 Pleasant Street
    ConcordNH 03301
    (603)229-4700
  • 10.-31.Rank: #10-31
    12

    Grades: 9-12, PG
    1000 Shumway Avenue
    FaribaultMN 55021
    (507)333-1618
  • 10.-31.Rank: #10-31
    12

    Grades: 9-12
    66 Spring Street
    MarionMA 02738
    (508)291-8300
  • 32.-43.Rank: #32-43
    13
    Grades: 9-12
    582 Columbus Avenue
    ThornwoodNY 10594
    (914)495-6028
  • 32.-43.Rank: #32-43
    13

    Grades: 9-12, PG | 6-12, PG (day)
    176 Edgerstoune Road
    PrincetonNJ 08540
    (609)921-7600
  • 32.-43.Rank: #32-43
    13

    Grades: 9-12, PG
    4000 M 137 Hwy
    InterlochenMI 49643
    (231)640-9353
  • 32.-43.Rank: #32-43
    13

    Grades: 7-12 | 5-12 (day)
    60 Knox Lane
    WheelingWV 26003
    (304)233-1436
  • 32.-43.Rank: #32-43
    The Pennington School
    (United Methodist)
    13

    Grades: 8-12 | 6-12 (day)
    112 West Delaware Avenue
    PenningtonNJ 08534
    (609)737-6128
  • 32.-43.Rank: #32-43
    13

    Grades: 9-12, PG
    180 Main Street
    AndoverMA 01810
    (978)749-4050
  • 32.-43.Rank: #32-43
    13

    Grades: 7-12 | Pre-K-12 (day)
    339 Nacoochee Drive
    Rabun GapGA 30568
    (706)746-7720
  • 32.-43.Rank: #32-43
    13

    Grades: 9-12
    2132 Ivy Road
    CharlottesvilleVA 22903
    (434)296-5106
  • 32.-43.Rank: #32-43
    13

    Grades: 9-12 | Pre-K-12 (day)
    1 Community School Drive
    Sun ValleyID 83353
    (208)622-3955
  • 32.-43.Rank: #32-43
    13

    Grades: 6-12, PG | Pre-K-12, PG (day)
    Via Collina d'Oro
    MontagnolaSwitzerland 6926
    41919605151
  • 32.-43.Rank: #32-43
    13

    Grades: 9-12, PG | 7-12, PG (day)
    19 Payson Avenue
    EasthamptonMA 01027
    (413)529-3241
  • 32.-43.Rank: #32-43
    13

    Grades: 9-12, PG | 6-12, PG (day)
    81 Providence Street
    WorcesterMA 01604
    (508)459-5481
  • 44.-54.Rank: #44-54
    14
    Grades: 9-12 | 6-12 (day)
    171 Baylor School Road
    ChattanoogaTN 37405
    (423)267-5902
  • 44.-54.Rank: #44-54
    14

    Grades: 9-12
    1300 Academy Road
    CulverIN 46511
    (574)842-7100
  • 44.-54.Rank: #44-54
    14

    Grades: 7-9 | K-9 (day)
    48 Main Street
    SouthboroughMA 01772
    (508)490-8201
  • 44.-54.Rank: #44-54
    George School
    George School Photo - Main Hall
    (Society of Friends)
    14

    Grades: 9-12
    1690 Newtown Langhorne Road
    NewtownPA 18940
    (215)579-6547
  • 44.-54.Rank: #44-54
    14

    Grades: 9-12 | 5-12 (day)
    49 Clinton Avenue
    Dobbs FerryNY 10522
    (914)479-6420
  • 44.-54.Rank: #44-54
    McCallie School
    McCallie School Photo - Through coordinate activities with our sister school GPS, our students interact with young women on a daily basis.
    All-Boys 
    14

    Grades: 9-12, PG | 6-12, PG (day)
    500 Dodds Avenue
    ChattanoogaTN 37404
    (800)234-2163
  • 44.-54.Rank: #44-54
    14

    Grades: 9-12 | K-12 (day)
    170 Centre Street
    MiltonMA 02186
    (617)898-2227
  • 44.-54.Rank: #44-54
    14

    Grades: 9-12 | Pre-K-12 (day)
    3152 Forest Lake Road
    Pebble BeachCA 93953
    (831)625-8309
  • 44.-54.Rank: #44-54
    14

    Grades: 7-12
    1 Chapman Parkway
    Stony BrookNY 11790
    (631)751-1800
  • 44.-54.Rank: #44-54
    14

    Grades: 7-12 | Pre-K-12 (day)
    6189 Winter Garden-Vineland Rd
    WindermereFL 34786
    (407)905-7737
  • 44.-54.Rank: #44-54
    Wyoming Seminary Upper School
    Wyoming Seminary Upper School Photo - Sem offers an exciting range and long list of clubs, activities and leadership opportunities. Often student-initiated, these groups provide experiences not found in the classroom or on the playing fields.
    (United Methodist)
    14

    Grades: 9-12, PG
    201 North Sprague Ave.
    KingstonPA 18704
    (570)270-2160
  • 55.-72.Rank: #55-72
    15
    Grades: 9-12 | 6-12 (day)
    2100 Mt. Diablo Scenic Blvd.
    DanvilleCA 94506
    (925)362-7223
  • 55.-72.Rank: #55-72
    15

    Grades: 9-12, PG | Pre-K-12, PG (day)
    7400 San Jose Blvd.
    JacksonvilleFL 32217
    (904)256-5030
  • 55.-72.Rank: #55-72
    15

    Grades: 8-12 | Pre-K-12 (day)
    1051 N Houston
    BullardTX 75757
    (903)894-5000
  • 55.-72.Rank: #55-72
    15

    Grades: 9-12, PG | Pre-K-12, PG (day)
    1014 Cave Spring Road, SW
    RomeGA 30161
    (706)235-6051
  • 55.-72.Rank: #55-72
    15

    Grades: 9-12, PG
    745 Main Street
    FryeburgME 04037
    (207)935-2013
  • 55.-72.Rank: #55-72
    15

    Grades: 8-12 | Pre-K-12 (day)
    300 Garrison Forest Road
    Owings MillsMD 21117
    (410)559-3111
  • 55.-72.Rank: #55-72
    The Hockaday School
    The Hockaday School Photo
    All-Girls 
    15

    Grades: 8-12 | Pre-K-12 (day)
    11600 Welch Road
    DallasTX 75229
    (214)360-6526
  • 55.-72.Rank: #55-72
    15

    Grades: 6-12, PG
    5500 34th Street West
    BradentonFL 34210
    (800)872-6425
  • 55.-72.Rank: #55-72
    The King's Academy
    The King's Academy Photo - The King's Academy's tranquil campus is located just outside the city of Knoxville near the majestic Great Smoky Mountains.
    (Christian)
    15

    Grades: 6-12, PG | Pre-K-12, PG (day)
    202 Smothers Road
    SeymourTN 37865
    (865)573-8321
  • 55.-72.Rank: #55-72
    15

    Grades: 9-12, PG
    101 West College Blvd
    RoswellNM 88201
    (800)421-5376
  • 55.-72.Rank: #55-72
    15

    Grades: 6-12 | Pre-K-12 (day)
    7600 Lyons Road
    Coconut CreekFL 33073
    (954)305-6937
  • 55.-72.Rank: #55-72
    15

    Grades: 9-12
    3900 Jog Road
    Boca RatonFL 33434
    (561)210-2020
  • 55.-72.Rank: #55-72
    15

    Grades: 9-12 | K-12 (day)
    1500 Butterfield Road
    San AnselmoCA 94960
    (415)258-1905
  • 55.-72.Rank: #55-72
    15

    Grades: 9-12 | Pre-K-12 (day)
    16923 Norwood Road
    Sandy SpringMD 20860
    (301)774-7455
  • 55.-72.Rank: #55-72
    15

    Grades: 9-12
    423 Fox Chapel Road
    PittsburghPA 15238
    (412)968-3180
  • 55.-72.Rank: #55-72
    15

    Grades: 7-12 | 5-12 (day)
    201 Campus Drive, PO Box 10
    Tallulah FallsGA 30573
    (706)754-0400
  • 55.-72.Rank: #55-72
    15

    Grades: 9-12 | 5-12 (day)
    55 Deblaquire St N.
    Port HopeCanada L1A4K7
    (905)885-3209
  • 55.-72.Rank: #55-72
    15

    Grades: 8-12, PG | 6-12, PG (day)
    423 Main Street
    WilbrahamMA 01095
    (413)596-9107
  • 73.-110.Rank: #73-110
    'Iolani School
    'Iolani School Photo
    (Episcopal)
    >15
    Grades: 9-12 | K-12 (day)
    563 Kamoku Street
    HonoluluHI 96826
    (808)943-2279
  • 73.-110.Rank: #73-110
    >15

    Grades: 9-12, PG
    2735 Mt. Baker Road
    Mill Bay, BC V0R 2P1Canada 1
    (250)743-5521
  • 73.-110.Rank: #73-110
    >15

    Grades: 9-12 | Pre-K-12 (day)
    PO Box 801 39221 Woodward Ave.
    Bloomfield HillsMI 48303
    (248)645-3610
  • 73.-110.Rank: #73-110
    Georgetown Preparatory School
    Georgetown Preparatory School Photo - Boland Hall is the home to many of Prep's 110 resident students. Our campus is less than 5 miles from the Nation's Capital
    All-Boys  (Catholic)
    >15

    Grades: 9-12
    10900 Rockville Pike
    North BethesdaMD 20852
    (301)214-1215
  • 73.-110.Rank: #73-110
    >15

    Grades: 7-12 | K-8 (day)
    No.11, Anfu Street, Houshayu, Shunyi District
    BeijingChina 101318
    8610804960082028
  • 73.-110.Rank: #73-110
    >15

    Grades: 9-12 | 6-12 (day)
    1415 Summit Avenue
    SeattleWA 98122
    (206)682-7309
  • 73.-110.Rank: #73-110
    >15

    Grades: 9-12
    3535 Commerce Rd.
    Orchard LakeMI 48324
    (248)683-0517
  • 73.-110.Rank: #73-110
    >15

    Grades: 9-12, PG | Pre-K-12, PG (day)
    6300 SW Nicol Road
    PortlandOR 97223
    (503)768-3115
  • 73.-110.Rank: #73-110
    >15

    Grades: 5-12, PG | Pre-K-12, PG (day)
    2 Ridley Road
    St CatharinesCanada l2r 7c3
    (905)684-1889
  • 73.-110.Rank: #73-110
    >15

    Grades: 8-12
    1975 Renfrew Road
    Shawnigan Lake, BCCanada V0R2W1
    (250)743-6207
  • 73.-110.Rank: #73-110
    >15

    Grades: 9-12
    1175 West Baseline Road
    ClaremontCA 91711
    (909)482-5214
  • 73.-110.Rank: #73-110
    >15

    Grades: 9-12 | 4-12 (day)
    362 Mariposa Avenue
    OttawaCanada K1M0T3
    (613)749-9630
  • 73.-110.Rank: #73-110
    >15

    Grades: 6-12
    425 South Lindbergh Blvd.
    St. LouisMO 63131
    (314)692-6640
  • 73.-110.Rank: #73-110
    >15

    Grades: 8-12 | Pre-K-12 (day)
    8401 Belvedere Rd
    West Palm BeachFL 33411
    (561)657-3470
  • 73.-110.Rank: #73-110
    >15

    Grades: 9-12
    2 School Way
    WatsonvilleCA 95076
    (831)768-6137
  • 73.-110.Rank: #73-110
    >15

    Grades: 8-12 | K-12 (day)
    3400 Richmond Road
    VictoriaCanada V8P 4P5
    (250)370-6170
  • 73.-110.Rank: #73-110
    >15

    Grades: 8-12 | 6-12 (day)
    6500 St. Stephen's Drive
    AustinTX 78746
    (512)327-1213
  • 73.-110.Rank: #73-110
    Branksome Hall
    All-Girls 
    >15

    Grades: 7-12 | Pre-K-12 (day)
    10 Elm Avenue
    TorontoCanada 00000
    (416)920-9741
  • 73.-110.Rank: #73-110
    >15

    Grades: 6-12
    438 Main Street
    SacoME 04072
    (207)282-5383
  • 73.-110.Rank: #73-110
    >15

    Grades: 7-12 | Pre-K-12 (day)
    13051 Whittington Dr.
    HoustonTX 77077
    (281)496-7900
  • 73.-110.Rank: #73-110
    >15

    Grades: 9-12
    811 W. Donovan Street
    HoustonTX 77091
    (312)416-1955
  • 73.-110.Rank: #73-110
    >15

    Grades: 9-12, PG
    330 N. Glenview Avenue
    Milwaukee WI 53213
    (414)453-4567
  • 73.-110.Rank: #73-110
    >15

    Grades: 9-12
    4026 Maher St.
    NapaCA 94558
    (312)416-1955
  • 73.-110.Rank: #73-110
    >15

    Grades: 8-12
    955 Harbourside Drive
    North Vancouver, BCCanada V7P 3S4
    (604)998-1000
  • 73.-110.Rank: #73-110
    >15

    Grades: 6-12 | Pre-K-12 (day)
    234 Global edu-ro, Daejeong-eup, Seogwipo-si
    Jeju-doSouth Korea 63644
    82649025072
  • 73.-110.Rank: #73-110
    >15

    Grades: 7-12, PG | Pre-K-12, PG (day)
    17235 Seventh Street
    MontverdeFL 34756
    (407)469-2561
  • 73.-110.Rank: #73-110
    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.
    (Christian)
    >15

    Grades: 6-12
    1200 Oakdale Ave.
    St. PaulMN 55118
    (651)455-1521
  • 73.-110.Rank: #73-110
    St. Francis High School
    St. Francis High School Photo - Friars' Hall
    All-Boys  (Catholic)
    >15

    Grades: 9-12
    4129 Lake Shore Road
    HamburgNY 14075
    (716)627-1200
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