Among "All Schools," view the twenty boarding schools with the "smallest student bodies." First, some important notes:
- School size comparisons are based on overall population of the school, not the number of boarding students at the school.
- The balance between boarders and day students can also be another factor to consider when looking at school size.
| Sorted by range (alphabetically within range) | * Indicates Boarding Grades Offered | ||
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| 1. Hampshire Country School | All-Boys | 3-12 | 25 |
| 2.-4. Linden Hill School | All-Boys | 3-9 | 30 |
| 2.-4. Lustre Christian High School | Co-Ed | 9-12 | 30 |
| 2.-4. The Meeting School | Co-Ed | 9-12, PG | 30 |
| 5. Maharishi Academy of Total Knowledge | All-Boys | 9-12 | 40 |
| 6. Colorado Timberline Academy | Co-Ed | 9-12, PG | 46 |
| 7. The Greenwood School | All-Boys | 4-9 | 47 |
| 8. Donahue Academy of Ave Maria | Co-Ed | 11-12 | 49 |
| 9. Oakdale Christian Academy | Co-Ed | 7-12 | 50 |
| 10. Oliverian School | Co-Ed | 9-12, PG | 54 |
| 11.-12. Nawa Academy | Co-Ed | 7-12 | 55 |
| 11.-12. Scattergood Friends School | Co-Ed | 9-12, PG | 55 |
| 13. Academy of the Holy Family | All-Girls | 9-12, PG | 57 |
| 14.-15. Brenau Academy | All-Girls | 9-12, PG | 60 |
| 14.-15. Oakland School | Co-Ed | 9-12 | 60 |
| 16. Olney Friends School | Co-Ed | 9-12 | 61 |
| 17. Oak Ridge Military Academy | Co-Ed | 7-12 | 63 |
| 18. Thomas Jefferson School | Co-Ed | 7-12, PG | 78 |
| 19.-21. The Leelanau School | Co-Ed | 9-12 | 80 |
| 19.-21. Lowell Whiteman School | Co-Ed | 9-12 | 80 |
| Sorted by range (alphabetically within range) | * Indicates Boarding Grades Offered | ||
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| 19.-21. Oak Creek Ranch School | Co-Ed | 7-12, PG | 80 |
| 22. Midland School | Co-Ed | 9-12 | 82 |
| 23.-24. Academy of St. Xavier | All-Boys | 7-12 | 85 |
| 23.-24. Squaw Valley Academy | Co-Ed | 6-12 | 85 |
| 25.-27. The Glenholme School | Co-Ed | 5-12, PG | 90 |
| 25.-27. Sedbergh School | Co-Ed | 7-12 | 90 |
| 25.-27. Venta Preparatory School | Co-Ed | 1-10 | 90 |
| 28. Buxton School | Co-Ed | 9-12 | 93 |
| 29.-31. Advanced Academy of Georgia | Co-Ed | 11-12 | 100 |
| 29.-31. Besant Hill School (Formerly Happy Valley School) | Co-Ed | 9-12 | 100 |
| 29.-31. The White Mountain School | Co-Ed | 9-12, PG | 100 |
| 32. Darrow School | Co-Ed | 9-12 | 102 |
| 33. High Mowing School | Co-Ed | 9-12 | 112 |
| 34. The Knox School | Co-Ed | 7-12, PG | 115 |
| 35. Grand River Academy | All-Boys | 9-12, PG | 118 |
| 36.-41. Brandon Hall School | Co-Ed | 4-12, PG | 120 |
| 36.-41. CCI The Renaissance School | Co-Ed | 10-12, PG | 120 |
| 36.-41. Fenster School | Co-Ed | 9-12 | 120 |
| 36.-41. Purnell School | All-Girls | 9-12 | 120 |
| 36.-41. Southwestern Academy | Co-Ed | 7-12, PG | 120 |
| 36.-41. West Nottingham Academy | Co-Ed | 9-12, PG | 120 |
| 42.-43. Hoosac School | Co-Ed | 8-12, PG | 125 |
| 42.-43. Stoneleigh-Burnham School | All-Girls | 7-12, PG | 125 |
| 44.-45. The Orme School of Arizona | Co-Ed | 8-12, PG | 126 |
| 44.-45. Verde Valley School | Co-Ed | 9-12 | 126 |
| 46. Carson Long Military Institute | All-Boys | 6-12 | 127 |
| 47. Hyde-Bath | Co-Ed | 9-12, PG | 128 |
| 48.-49. Chatham Hall | All-Girls | 9-12 | 129 |
| 48.-49. St. Margaret's School | All-Girls | 8-12 | 129 |
| 50. Dublin School | Co-Ed | 9-12 | 130 |
| 51. Country Day School, Costa Rica | Co-Ed | 8-12 | 135 |
| 52.-53. Oak Hill Academy | Co-Ed | 8-12 | 140 |
| 52.-53. The Phelps School | All-Boys | 7-12, PG | 140 |
| 54.-55. Rosseau Lake College | Co-Ed | 7-12, PG | 141 |
| 54.-55. The Storm King School | Co-Ed | 8-12 | 141 |
| 56.-59. Hillside School | All-Boys | 5-9 | 145 |
| 56.-59. Hyde-Woodstock | Co-Ed | 9-12, PG | 145 |
| 56.-59. Miller School | Co-Ed | 8-12, PG | 145 |
| 56.-59. South Kent School | All-Boys | 9-12, PG | 145 |
| 60. The Gow School | All-Boys | 7-12, PG | 147 |
| 61.-63. Oldfields School | All-Girls | 8-12, PG | 150 |
| 61.-63. St. Catherine's Military Academy | All-Boys | 4-8 | 150 |
| 61.-63. San Domenico School | All-Girls | 9-12 | 150 |
| 64. Houghton Academy | Co-Ed | 9-12, PG | 153 |
| 65.-68. Annie Wright School | All-Girls | 9-12 | 160 |
| 65.-68. Colorado Rocky Mountain School | Co-Ed | 9-12 | 160 |
| 65.-68. St. Timothy's School | All-Girls | 9-12, PG | 160 |
| 65.-68. Salem Academy | All-Girls | 9-12 | 160 |
| 69. Buffalo Seminary | All-Girls | 9-12 | 161 |
| 70. St. Andrew's-Sewanee School | Co-Ed | 9-12 | 164 |
| 71.-73. Fishburne Military School | All-Boys | 7-12, PG | 170 |
| 71.-73. The Marvelwood School | Co-Ed | 9-12, PG | 170 |
| 71.-73. Massanutten Military Academy | Co-Ed | 7-12, PG | 170 |
| 74. Eagle Hill School | Co-Ed | 8-12 | 171 |
| 75. Foxcroft School | All-Girls | 9-12 | 173 |
| 76.-82. Chapel Hill-Chauncy Hall | Co-Ed | 9-12, PG | 175 |
| 76.-82. Linden Hall | All-Girls | 6-12, PG | 175 |
| 76.-82. Northwood School | Co-Ed | 9-12, PG | 175 |
| 76.-82. Oakwood Friends School | Co-Ed | 9-12 | 175 |
| 76.-82. Rothesay Netherwood School | Co-Ed | 6-12 | 175 |
| 76.-82. Stanstead College | Co-Ed | 7-12 | 175 |
| 76.-82. Subiaco Academy | All-Boys | 7-12 | 175 |
| 83. La Lumiere School | Co-Ed | 9-12, PG | 178 |
| 84.-87. CFS, The School at Church Farm | All-Boys | 7-12 | 180 |
| 84.-87. The Forman School | Co-Ed | 9-12, PG | 180 |
| 84.-87. Tallulah Falls School | Co-Ed | 7-12 | 180 |
| 84.-87. Wolfeboro: The Summer Boarding School | Co-Ed | 6-12, PG | 180 |
| 88. Dunn School | Co-Ed | 9-12 | 184 |
| 89.-90. Cardigan Mountain School | All-Boys | 6-9 | 185 |
| 89.-90. St. Thomas More School | All-Boys | 8-12, PG | 185 |
| 91. Miss Hall's School | All-Girls | 9-12, PG | 188 |
| 92. Christchurch School | All-Boys | 9-12, PG | 190 |
| 93.-94. Bridgton Academy | All-Boys | 12-12, PG | 192 |
| 93.-94. Howe Military School & Summer Camp | Co-Ed | 5-12 | 192 |
| 95. Blue Ridge School | All-Boys | 9-12 | 195 |
| 96. New York Military Academy | Co-Ed | 7-12, PG | 200 |
| 97. Vermont Academy | Co-Ed | 9-12, PG | 205 |
| 98. Wentworth Military Academy & College | Co-Ed | 9-12, PG | 206 |
| 99. St. Andrew's School - RI | Co-Ed | 9-12 | 208 |
| 100. Westover School | All-Girls | 9-12 | 209 |
| 101.-102. The Kiski School | All-Boys | 9-12, PG | 210 |
| 101.-102. Virginia Episcopal School | Co-Ed | 9-12 | 210 |
| 103. The MacDuffie School | Co-Ed | 9-12 | 215 |
| 104.-106. Grier School | All-Girls | 6-12, PG | 220 |
| 104.-106. Solebury School | Co-Ed | 9-12 | 220 |
| 104.-106. The Winchendon School | Co-Ed | 9-12, PG | 220 |
| 107. The Rectory School | Co-Ed | 5-9 | 226 |
| 108.-109. Christ School | All-Boys | 8-12 | 227 |
| 108.-109. The Putney School | Co-Ed | 9-12, PG | 227 |
| 110.-111. Kents Hill School | Co-Ed | 9-12, PG | 230 |
| 110.-111. Wasatch Academy | Co-Ed | 9-12, PG | 230 |
| 112. Saint James School | Co-Ed | 8-12 | 231 |
| 113. Wayland Academy | Co-Ed | 9-12 | 235 |
| 114. Santa Catalina School | All-Girls | 9-12 | 240 |
| 115. Family First Academy | Co-Ed | 8-12 | 241 |
| 116.-117. Bement School | Co-Ed | 3-9 | 244 |
| 116.-117. Hebron Academy | Co-Ed | 9-12, PG | 244 |
| 118.-121. Fountain Valley School of Colorado | Co-Ed | 9-12 | 250 |
| 118.-121. Gould Academy | Co-Ed | 9-12, PG | 250 |
| 118.-121. The Thacher School | Co-Ed | 9-12 | 250 |
| 118.-121. Tilton School | Co-Ed | 9-12, PG | 250 |
| 122. Garrison Forest School | All-Girls | 8-12 | 260 |
| 123. San Marcos Baptist Academy | Co-Ed | 7-12 | 263 |
| 124. Millbrook School | Co-Ed | 9-12, PG | 264 |
| 125.-127. Asheville School | Co-Ed | 9-12 | 265 |
| 125.-127. Cate School | Co-Ed | 9-12 | 265 |
| 125.-127. Idyllwild Arts Academy | Co-Ed | 9-12, PG | 265 |
| 128. The Ethel Walker School | All-Girls | 9-12 | 270 |
| 129. The Delphian School | Co-Ed | 3-12 | 272 |
| 130. Saint Mary's School | All-Girls | 9-12 | 277 |
| 131. Indian Springs School | Co-Ed | 9-12 | 281 |
| 132. Holderness School | Co-Ed | 9-12, PG | 284 |
| 133. The Gunnery | Co-Ed | 9-12, PG | 286 |
| 134. Missouri Military Academy | All-Boys | 6-12, PG | 292 |
| 135. Ojai Valley School | Co-Ed | 3-12 | 295 |
| 136.-138. The Athenian School | Co-Ed | 9-12 | 300 |
| 136.-138. Perkiomen School | Co-Ed | 7-12, PG | 300 |
| 136.-138. St. Andrew's School, DE | Co-Ed | 9-12 | 300 |
| 139. Camden Military Academy | All-Boys | 7-12, PG | 302 |
| 140.-141. Oregon Episcopal School | Co-Ed | 9-12 | 303 |
| 140.-141. Salisbury School | All-Boys | 9-12, PG | 303 |
| 142.-143. New Hampton School | Co-Ed | 9-12, PG | 305 |
| 142.-143. Valley Forge Military Academy | All-Boys | 7-12, PG | 305 |
| 144. Emma Willard School | All-Girls | 9-12, PG | 307 |
| 145. Cotter Schools | Co-Ed | 9-12, PG | 310 |
| 146. The Madeira School | All-Girls | 9-12 | 313 |
| 147. Villanova Preparatory School | Co-Ed | 9-12 | 315 |
| 148. The Webb School | Co-Ed | 7-12, PG | 319 |
| 149.-150. Army and Navy Academy | All-Boys | 7-12 | 320 |
| 149.-150. Riverside Military Academy | All-Boys | 7-12 | 320 |
| 151. Saint John's Preparatory School | Co-Ed | 9-12, PG | 321 |
| 152. Miss Porter's School | All-Girls | 9-12 | 322 |
| 153. George Stevens Academy | Co-Ed | 9-12 | 324 |
| 154.-156. The Cambridge School of Weston | Co-Ed | 9-12, PG | 325 |
| 154.-156. Kimball Union Academy | Co-Ed | 9-12, PG | 325 |
| 154.-156. Trinity Pawling School | All-Boys | 9-12, PG | 325 |
| 157. Stuart Hall School | Co-Ed | 8-12 | 326 |
| 158. Andrews Osborne Academy | Co-Ed | 7-12 | 329 |
| 159. St. John's Northwestern Military Academy | All-Boys | 7-12, PG | 335 |
| 160. The Stony Brook School | Co-Ed | 7-12 | 337 |
| 161. St. Mark's School | Co-Ed | 9-12 | 338 |
| 162. Rabun Gap-Nacoochee School | Co-Ed | 7-12 | 340 |
| 163. Admiral Farragut Academy | Co-Ed | 6-12 | 348 |
| 164. Proctor Academy | Co-Ed | 9-12, PG | 349 |
| 165.-167. Bronte College of Canada | Co-Ed | 9-12, PG | 350 |
| 165.-167. Pomfret School | Co-Ed | 9-12, PG | 350 |
| 165.-167. Woodside Priory School (The Priory) | Co-Ed | 9-12 | 350 |
| 168. Portsmouth Abbey School | Co-Ed | 9-12 | 355 |
| 169.-170. Canterbury School | Co-Ed | 9-12, PG | 357 |
| 169.-170. St. George's School | Co-Ed | 9-12 | 357 |
| 171. Brooks School | Co-Ed | 9-12 | 358 |
| 172.-173. Brewster Academy | Co-Ed | 9-12, PG | 360 |
| 172.-173. Florida Air Academy | Co-Ed | 6-12 | 360 |
| 174. Wilbraham & Monson Academy | Co-Ed | 9-12, PG | 362 |
| 175. Cheshire Academy | Co-Ed | 9-12, PG | 363 |
| 176. Randolph-Macon Academy | Co-Ed | 6-12, PG | 365 |
| 177. Middlesex School | Co-Ed | 9-12 | 368 |
| 178.-180. Hargrave Military Academy | All-Boys | 7-12, PG | 370 |
| 178.-180. TASIS The American School in England | Co-Ed | 9-12, PG | 370 |
| 178.-180. The Webb Schools | Co-Ed | 9-12 | 370 |
| 181. St. Stanislaus College | All-Boys | 7-12 | 371 |
| 182. Concord Academy | Co-Ed | 9-12 | 373 |
| 183. Groton School | Co-Ed | 8-12 | 375 |
| 184.-185. Berkshire School | Co-Ed | 9-12, PG | 380 |
| 184.-185. Fay School | Co-Ed | 6-9 | 380 |
| 186.-187. Leysin American School in Switzerland (LAS) | Co-Ed | 8-12, PG | 385 |
| 186.-187. Westminster School | Co-Ed | 9-12, PG | 385 |
| 188.-189. Western Reserve Academy | Co-Ed | 9-12, PG | 391 |
| 188.-189. Woodberry Forest School | All-Boys | 9-12 | 391 |
| 190. Lawrence Academy | Co-Ed | 9-12 | 394 |
| 191. The Governor's Academy (formerly Governor Dummer Academy) | Co-Ed | 9-12 | 397 |
| 192.-193. The King's Academy | Co-Ed | 7-12 | 398 |
| 192.-193. Westtown School | Co-Ed | 9-12 | 398 |
| 194. Lake Forest Academy | Co-Ed | 9-12, PG | 400 |
| 195.-196. Flintridge Sacred Heart Academy | All-Girls | 9-12 | 404 |
| 195.-196. TMI -The Episcopal School of Texas | Co-Ed | 8-12 | 404 |
| 197. Avon Old Farms School | All-Boys | 9-12, PG | 405 |
| 198. Washington Academy | Co-Ed | 9-12, PG | 411 |
| 199. Suffield Academy | Co-Ed | 9-12, PG | 412 |
| 200. The Masters School | Co-Ed | 9-12 | 415 |
| 201.-202. Brentwood College School | Co-Ed | 9-12, PG | 430 |
| 201.-202. Mercersburg Academy | Co-Ed | 9-12, PG | 430 |
| 203.-204. Episcopal High School | Co-Ed | 9-12 | 435 |
| 203.-204. Shattuck-St. Mary's School | Co-Ed | 6-12, PG | 435 |
| 205. Foxcroft Academy | Co-Ed | 9-12, PG | 440 |
| 206. Wyoming Seminary Upper School | Co-Ed | 9-12, PG | 442 |
| 207. The Linsly School | Co-Ed | 7-12 | 443 |
| 208.-209. Cushing Academy | Co-Ed | 9-12, PG | 445 |
| 208.-209. Shawnigan Lake School | Co-Ed | 8-12 | 445 |
| 210. Blair Academy | Co-Ed | 9-12, PG | 447 |
| 211. St. Croix Schools | Co-Ed | 6-12, PG | 450 |
| 212. Landmark School | Co-Ed | 9-12 | 455 |
| 213. The Williston Northampton School | Co-Ed | 9-12, PG | 460 |
| 214. Carlisle School | Co-Ed | 9-12 | 469 |
| 215. Georgetown Preparatory School | All-Boys | 9-12 | 473 |
| 216. Havergal College | All-Girls | 9-12 | 475 |
| 217. The Pennington School | Co-Ed | 7-12 | 485 |
| 218. Dana Hall School | All-Girls | 9-12 | 487 |
| 219. Ashbury College | Co-Ed | 9-12 | 490 |
| 220. Hill School | Co-Ed | 9-12, PG | 493 |
| 221. Interlochen Arts Academy | Co-Ed | 9-12, PG | 500 |
| 222. The Brook Hill School | Co-Ed | 8-12 | 503 |
| 223. Tabor Academy | Co-Ed | 9-12 | 504 |
| 224. Stevenson School | Co-Ed | 9-12 | 520 |
| 225. Peddie School | Co-Ed | 9-12, PG | 525 |
| 226.-227. Fork Union Military Academy | All-Boys | 6-12, PG | 535 |
| 226.-227. St. Paul's School | Co-Ed | 9-12 | 535 |
| 228. George School | Co-Ed | 9-12 | 540 |
| 229. Kent School | Co-Ed | 9-12, PG | 565 |
| 230. St. Andrew's College | All-Boys | 6-12 | 570 |
| 231. The Taft School | Co-Ed | 9-12, PG | 574 |
| 232.-233. Hawaii Preparatory Academy | Co-Ed | 6-12, PG | 575 |
| 232.-233. St. Albans School | All-Boys | 9-12 | 575 |
| 234. Saint Andrew's School | Co-Ed | 9-12 | 591 |
| 235.-236. The Hotchkiss School | Co-Ed | 9-12, PG | 595 |
| 235.-236. The Hun School of Princeton | Co-Ed | 9-12, PG | 595 |
| 237. Ridley College | Co-Ed | Pre-K-12, PG | 600 |
| 238.-239. Deerfield Academy | Co-Ed | 9-12, PG | 630 |
| 238.-239. Northfield Mount Hermon School | Co-Ed | 9-12, PG | 630 |
| 240. McCallie School | All-Boys | 9-12 | 652 |
| 241.-242. Fryeburg Academy | Co-Ed | 9-12, PG | 665 |
| 241.-242. St. Stephen's Episcopal School | Co-Ed | 8-12 | 665 |
| 243. Milton Academy | Co-Ed | 9-12 | 670 |
| 244. The Loomis Chaffee School | Co-Ed | 9-12, PG | 690 |
| 245. Baylor School | Co-Ed | 9-12 | 700 |
| 246. Montverde Academy | Co-Ed | 7-12, PG | 705 |
| 247. Monte Vista Christian School | Co-Ed | 9-12 | 766 |
| 248. Cranbrook Schools | Co-Ed | 9-12 | 775 |
| 249. Culver Academies | Co-Ed | 9-12 | 792 |
| 250. Lawrenceville School | Co-Ed | 9-12, PG | 795 |
| 251. St. Anne's-Belfield School | Co-Ed | 9-12 | 841 |
| 252. Choate Rosemary Hall | Co-Ed | 9-12, PG | 850 |
| 253. New Mexico Military Institute | Co-Ed | 9-12, PG | 870 |
| 254. The Bishop Strachan School | All-Girls | 7-12 | 885 |
| 255. Darlington School | Co-Ed | 9-12, PG | 898 |
| 256. St. Michaels University School | Co-Ed | 8-12 | 938 |
| 257. St. Johnsbury Academy | Co-Ed | 9-12, PG | 989 |
| 258. Phillips Exeter Academy | Co-Ed | 9-12, PG | 1045 |
| 259. The Hockaday School | All-Girls | 8-12 | 1083 |
| 260. Phillips Academy Andover | Co-Ed | 9-12, PG | 1100 |
| 261. Thornton Academy | Co-Ed | 9-12 | 1200 |
| 262. The Bolles School | Co-Ed | 7-12, PG | 1213 |
| 263. North Broward Preparatory School | Co-Ed | 7-12 | 1611 |
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