Among "All Schools," view the twenty boarding schools with the "largest 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. North Broward Preparatory School | Co-Ed | 7-12 | 1611 |
| 2. The Bolles School | Co-Ed | 7-12, PG | 1213 |
| 3. Thornton Academy | Co-Ed | 9-12 | 1200 |
| 4. Phillips Academy Andover | Co-Ed | 9-12, PG | 1100 |
| 5. The Hockaday School | All-Girls | 8-12 | 1083 |
| 6. Phillips Exeter Academy | Co-Ed | 9-12, PG | 1045 |
| 7. St. Johnsbury Academy | Co-Ed | 9-12, PG | 989 |
| 8. St. Michaels University School | Co-Ed | 8-12 | 938 |
| 9. Darlington School | Co-Ed | 9-12, PG | 898 |
| 10. The Bishop Strachan School | All-Girls | 7-12 | 885 |
| 11. New Mexico Military Institute | Co-Ed | 9-12, PG | 870 |
| 12. Choate Rosemary Hall | Co-Ed | 9-12, PG | 850 |
| 13. St. Anne's-Belfield School | Co-Ed | 9-12 | 841 |
| 14. Lawrenceville School | Co-Ed | 9-12, PG | 795 |
| 15. Culver Academies | Co-Ed | 9-12 | 792 |
| 16. Cranbrook Schools | Co-Ed | 9-12 | 775 |
| 17. Monte Vista Christian School | Co-Ed | 9-12 | 766 |
| 18. Montverde Academy | Co-Ed | 7-12, PG | 705 |
| 19. Baylor School | Co-Ed | 9-12 | 700 |
| 20. The Loomis Chaffee School | Co-Ed | 9-12, PG | 690 |
| Sorted by range (alphabetically within range) | * Indicates Boarding Grades Offered | ||
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| 21. Milton Academy | Co-Ed | 9-12 | 670 |
| 22.-23. Fryeburg Academy | Co-Ed | 9-12, PG | 665 |
| 22.-23. St. Stephen's Episcopal School | Co-Ed | 8-12 | 665 |
| 24. McCallie School | All-Boys | 9-12 | 652 |
| 25.-26. Deerfield Academy | Co-Ed | 9-12, PG | 630 |
| 25.-26. Northfield Mount Hermon School | Co-Ed | 9-12, PG | 630 |
| 27. Ridley College | Co-Ed | Pre-K-12, PG | 600 |
| 28.-29. The Hotchkiss School | Co-Ed | 9-12, PG | 595 |
| 28.-29. The Hun School of Princeton | Co-Ed | 9-12, PG | 595 |
| 30. Saint Andrew's School | Co-Ed | 9-12 | 591 |
| 31.-32. Hawaii Preparatory Academy | Co-Ed | 6-12, PG | 575 |
| 31.-32. St. Albans School | All-Boys | 9-12 | 575 |
| 33. The Taft School | Co-Ed | 9-12, PG | 574 |
| 34. St. Andrew's College | All-Boys | 6-12 | 570 |
| 35. Kent School | Co-Ed | 9-12, PG | 565 |
| 36. George School | Co-Ed | 9-12 | 540 |
| 37.-38. Fork Union Military Academy | All-Boys | 6-12, PG | 535 |
| 37.-38. St. Paul's School | Co-Ed | 9-12 | 535 |
| 39. Peddie School | Co-Ed | 9-12, PG | 525 |
| 40. Stevenson School | Co-Ed | 9-12 | 520 |
| 41. Tabor Academy | Co-Ed | 9-12 | 504 |
| 42. The Brook Hill School | Co-Ed | 8-12 | 503 |
| 43. Interlochen Arts Academy | Co-Ed | 9-12, PG | 500 |
| 44. Hill School | Co-Ed | 9-12, PG | 493 |
| 45. Ashbury College | Co-Ed | 9-12 | 490 |
| 46. Dana Hall School | All-Girls | 9-12 | 487 |
| 47. The Pennington School | Co-Ed | 7-12 | 485 |
| 48. Havergal College | All-Girls | 9-12 | 475 |
| 49. Georgetown Preparatory School | All-Boys | 9-12 | 473 |
| 50. Carlisle School | Co-Ed | 9-12 | 469 |
| 51. The Williston Northampton School | Co-Ed | 9-12, PG | 460 |
| 52. Landmark School | Co-Ed | 9-12 | 455 |
| 53. St. Croix Schools | Co-Ed | 6-12, PG | 450 |
| 54. Blair Academy | Co-Ed | 9-12, PG | 447 |
| 55.-56. Cushing Academy | Co-Ed | 9-12, PG | 445 |
| 55.-56. Shawnigan Lake School | Co-Ed | 8-12 | 445 |
| 57. The Linsly School | Co-Ed | 7-12 | 443 |
| 58. Wyoming Seminary Upper School | Co-Ed | 9-12, PG | 442 |
| 59. Foxcroft Academy | Co-Ed | 9-12, PG | 440 |
| 60.-61. Episcopal High School | Co-Ed | 9-12 | 435 |
| 60.-61. Shattuck-St. Mary's School | Co-Ed | 6-12, PG | 435 |
| 62.-63. Brentwood College School | Co-Ed | 9-12, PG | 430 |
| 62.-63. Mercersburg Academy | Co-Ed | 9-12, PG | 430 |
| 64. The Masters School | Co-Ed | 9-12 | 415 |
| 65. Suffield Academy | Co-Ed | 9-12, PG | 412 |
| 66. Washington Academy | Co-Ed | 9-12, PG | 411 |
| 67. Avon Old Farms School | All-Boys | 9-12, PG | 405 |
| 68.-69. Flintridge Sacred Heart Academy | All-Girls | 9-12 | 404 |
| 68.-69. TMI -The Episcopal School of Texas | Co-Ed | 8-12 | 404 |
| 70. Lake Forest Academy | Co-Ed | 9-12, PG | 400 |
| 71.-72. The King's Academy | Co-Ed | 7-12 | 398 |
| 71.-72. Westtown School | Co-Ed | 9-12 | 398 |
| 73. The Governor's Academy (formerly Governor Dummer Academy) | Co-Ed | 9-12 | 397 |
| 74. Lawrence Academy | Co-Ed | 9-12 | 394 |
| 75.-76. Western Reserve Academy | Co-Ed | 9-12, PG | 391 |
| 75.-76. Woodberry Forest School | All-Boys | 9-12 | 391 |
| 77.-78. Leysin American School in Switzerland (LAS) | Co-Ed | 8-12, PG | 385 |
| 77.-78. Westminster School | Co-Ed | 9-12, PG | 385 |
| 79.-80. Berkshire School | Co-Ed | 9-12, PG | 380 |
| 79.-80. Fay School | Co-Ed | 6-9 | 380 |
| 81. Groton School | Co-Ed | 8-12 | 375 |
| 82. Concord Academy | Co-Ed | 9-12 | 373 |
| 83. St. Stanislaus College | All-Boys | 7-12 | 371 |
| 84.-86. Hargrave Military Academy | All-Boys | 7-12, PG | 370 |
| 84.-86. TASIS The American School in England | Co-Ed | 9-12, PG | 370 |
| 84.-86. The Webb Schools | Co-Ed | 9-12 | 370 |
| 87. Middlesex School | Co-Ed | 9-12 | 368 |
| 88. Randolph-Macon Academy | Co-Ed | 6-12, PG | 365 |
| 89. Cheshire Academy | Co-Ed | 9-12, PG | 363 |
| 90. Wilbraham & Monson Academy | Co-Ed | 9-12, PG | 362 |
| 91.-92. Brewster Academy | Co-Ed | 9-12, PG | 360 |
| 91.-92. Florida Air Academy | Co-Ed | 6-12 | 360 |
| 93. Brooks School | Co-Ed | 9-12 | 358 |
| 94.-95. Canterbury School | Co-Ed | 9-12, PG | 357 |
| 94.-95. St. George's School | Co-Ed | 9-12 | 357 |
| 96. Portsmouth Abbey School | Co-Ed | 9-12 | 355 |
| 97.-99. Bronte College of Canada | Co-Ed | 9-12, PG | 350 |
| 97.-99. Pomfret School | Co-Ed | 9-12, PG | 350 |
| 97.-99. Woodside Priory School (The Priory) | Co-Ed | 9-12 | 350 |
| 100. Proctor Academy | Co-Ed | 9-12, PG | 349 |
| 101. Admiral Farragut Academy | Co-Ed | 6-12 | 348 |
| 102. Rabun Gap-Nacoochee School | Co-Ed | 7-12 | 340 |
| 103. St. Mark's School | Co-Ed | 9-12 | 338 |
| 104. The Stony Brook School | Co-Ed | 7-12 | 337 |
| 105. St. John's Northwestern Military Academy | All-Boys | 7-12, PG | 335 |
| 106. Andrews Osborne Academy | Co-Ed | 7-12 | 329 |
| 107. Stuart Hall School | Co-Ed | 8-12 | 326 |
| 108.-110. The Cambridge School of Weston | Co-Ed | 9-12, PG | 325 |
| 108.-110. Kimball Union Academy | Co-Ed | 9-12, PG | 325 |
| 108.-110. Trinity Pawling School | All-Boys | 9-12, PG | 325 |
| 111. George Stevens Academy | Co-Ed | 9-12 | 324 |
| 112. Miss Porter's School | All-Girls | 9-12 | 322 |
| 113. Saint John's Preparatory School | Co-Ed | 9-12, PG | 321 |
| 114.-115. Army and Navy Academy | All-Boys | 7-12 | 320 |
| 114.-115. Riverside Military Academy | All-Boys | 7-12 | 320 |
| 116. The Webb School | Co-Ed | 7-12, PG | 319 |
| 117. Villanova Preparatory School | Co-Ed | 9-12 | 315 |
| 118. The Madeira School | All-Girls | 9-12 | 313 |
| 119. Cotter Schools | Co-Ed | 9-12, PG | 310 |
| 120. Emma Willard School | All-Girls | 9-12, PG | 307 |
| 121.-122. New Hampton School | Co-Ed | 9-12, PG | 305 |
| 121.-122. Valley Forge Military Academy | All-Boys | 7-12, PG | 305 |
| 123.-124. Oregon Episcopal School | Co-Ed | 9-12 | 303 |
| 123.-124. Salisbury School | All-Boys | 9-12, PG | 303 |
| 125. Camden Military Academy | All-Boys | 7-12, PG | 302 |
| 126.-128. The Athenian School | Co-Ed | 9-12 | 300 |
| 126.-128. Perkiomen School | Co-Ed | 7-12, PG | 300 |
| 126.-128. St. Andrew's School, DE | Co-Ed | 9-12 | 300 |
| 129. Ojai Valley School | Co-Ed | 3-12 | 295 |
| 130. Missouri Military Academy | All-Boys | 6-12, PG | 292 |
| 131. The Gunnery | Co-Ed | 9-12, PG | 286 |
| 132. Holderness School | Co-Ed | 9-12, PG | 284 |
| 133. Indian Springs School | Co-Ed | 9-12 | 281 |
| 134. Saint Mary's School | All-Girls | 9-12 | 277 |
| 135. The Delphian School | Co-Ed | 3-12 | 272 |
| 136. The Ethel Walker School | All-Girls | 9-12 | 270 |
| 137.-139. Asheville School | Co-Ed | 9-12 | 265 |
| 137.-139. Cate School | Co-Ed | 9-12 | 265 |
| 137.-139. Idyllwild Arts Academy | Co-Ed | 9-12, PG | 265 |
| 140. Millbrook School | Co-Ed | 9-12, PG | 264 |
| 141. San Marcos Baptist Academy | Co-Ed | 7-12 | 263 |
| 142. Garrison Forest School | All-Girls | 8-12 | 260 |
| 143.-146. Fountain Valley School of Colorado | Co-Ed | 9-12 | 250 |
| 143.-146. Gould Academy | Co-Ed | 9-12, PG | 250 |
| 143.-146. The Thacher School | Co-Ed | 9-12 | 250 |
| 143.-146. Tilton School | Co-Ed | 9-12, PG | 250 |
| 147.-148. Bement School | Co-Ed | 3-9 | 244 |
| 147.-148. Hebron Academy | Co-Ed | 9-12, PG | 244 |
| 149. Family First Academy | Co-Ed | 8-12 | 241 |
| 150. Santa Catalina School | All-Girls | 9-12 | 240 |
| 151. Wayland Academy | Co-Ed | 9-12 | 235 |
| 152. Saint James School | Co-Ed | 8-12 | 231 |
| 153.-154. Kents Hill School | Co-Ed | 9-12, PG | 230 |
| 153.-154. Wasatch Academy | Co-Ed | 9-12, PG | 230 |
| 155.-156. Christ School | All-Boys | 8-12 | 227 |
| 155.-156. The Putney School | Co-Ed | 9-12, PG | 227 |
| 157. The Rectory School | Co-Ed | 5-9 | 226 |
| 158.-160. Grier School | All-Girls | 6-12, PG | 220 |
| 158.-160. Solebury School | Co-Ed | 9-12 | 220 |
| 158.-160. The Winchendon School | Co-Ed | 9-12, PG | 220 |
| 161. The MacDuffie School | Co-Ed | 9-12 | 215 |
| 162.-163. The Kiski School | All-Boys | 9-12, PG | 210 |
| 162.-163. Virginia Episcopal School | Co-Ed | 9-12 | 210 |
| 164. Westover School | All-Girls | 9-12 | 209 |
| 165. St. Andrew's School - RI | Co-Ed | 9-12 | 208 |
| 166. Wentworth Military Academy & College | Co-Ed | 9-12, PG | 206 |
| 167. Vermont Academy | Co-Ed | 9-12, PG | 205 |
| 168. New York Military Academy | Co-Ed | 7-12, PG | 200 |
| 169. Blue Ridge School | All-Boys | 9-12 | 195 |
| 170.-171. Bridgton Academy | All-Boys | 12-12, PG | 192 |
| 170.-171. Howe Military School & Summer Camp | Co-Ed | 5-12 | 192 |
| 172. Christchurch School | All-Boys | 9-12, PG | 190 |
| 173. Miss Hall's School | All-Girls | 9-12, PG | 188 |
| 174.-175. Cardigan Mountain School | All-Boys | 6-9 | 185 |
| 174.-175. St. Thomas More School | All-Boys | 8-12, PG | 185 |
| 176. Dunn School | Co-Ed | 9-12 | 184 |
| 177.-180. CFS, The School at Church Farm | All-Boys | 7-12 | 180 |
| 177.-180. The Forman School | Co-Ed | 9-12, PG | 180 |
| 177.-180. Tallulah Falls School | Co-Ed | 7-12 | 180 |
| 177.-180. Wolfeboro: The Summer Boarding School | Co-Ed | 6-12, PG | 180 |
| 181. La Lumiere School | Co-Ed | 9-12, PG | 178 |
| 182.-188. Chapel Hill-Chauncy Hall | Co-Ed | 9-12, PG | 175 |
| 182.-188. Linden Hall | All-Girls | 6-12, PG | 175 |
| 182.-188. Northwood School | Co-Ed | 9-12, PG | 175 |
| 182.-188. Oakwood Friends School | Co-Ed | 9-12 | 175 |
| 182.-188. Rothesay Netherwood School | Co-Ed | 6-12 | 175 |
| 182.-188. Stanstead College | Co-Ed | 7-12 | 175 |
| 182.-188. Subiaco Academy | All-Boys | 7-12 | 175 |
| 189. Foxcroft School | All-Girls | 9-12 | 173 |
| 190. Eagle Hill School | Co-Ed | 8-12 | 171 |
| 191.-193. Fishburne Military School | All-Boys | 7-12, PG | 170 |
| 191.-193. The Marvelwood School | Co-Ed | 9-12, PG | 170 |
| 191.-193. Massanutten Military Academy | Co-Ed | 7-12, PG | 170 |
| 194. St. Andrew's-Sewanee School | Co-Ed | 9-12 | 164 |
| 195. Buffalo Seminary | All-Girls | 9-12 | 161 |
| 196.-199. Annie Wright School | All-Girls | 9-12 | 160 |
| 196.-199. Colorado Rocky Mountain School | Co-Ed | 9-12 | 160 |
| 196.-199. St. Timothy's School | All-Girls | 9-12, PG | 160 |
| 196.-199. Salem Academy | All-Girls | 9-12 | 160 |
| 200. Houghton Academy | Co-Ed | 9-12, PG | 153 |
| 201.-203. Oldfields School | All-Girls | 8-12, PG | 150 |
| 201.-203. St. Catherine's Military Academy | All-Boys | 4-8 | 150 |
| 201.-203. San Domenico School | All-Girls | 9-12 | 150 |
| 204. The Gow School | All-Boys | 7-12, PG | 147 |
| 205.-208. Hillside School | All-Boys | 5-9 | 145 |
| 205.-208. Hyde-Woodstock | Co-Ed | 9-12, PG | 145 |
| 205.-208. Miller School | Co-Ed | 8-12, PG | 145 |
| 205.-208. South Kent School | All-Boys | 9-12, PG | 145 |
| 209.-210. Rosseau Lake College | Co-Ed | 7-12, PG | 141 |
| 209.-210. The Storm King School | Co-Ed | 8-12 | 141 |
| 211.-212. Oak Hill Academy | Co-Ed | 8-12 | 140 |
| 211.-212. The Phelps School | All-Boys | 7-12, PG | 140 |
| 213. Country Day School, Costa Rica | Co-Ed | 8-12 | 135 |
| 214. Dublin School | Co-Ed | 9-12 | 130 |
| 215.-216. Chatham Hall | All-Girls | 9-12 | 129 |
| 215.-216. St. Margaret's School | All-Girls | 8-12 | 129 |
| 217. Hyde-Bath | Co-Ed | 9-12, PG | 128 |
| 218. Carson Long Military Institute | All-Boys | 6-12 | 127 |
| 219.-220. The Orme School of Arizona | Co-Ed | 8-12, PG | 126 |
| 219.-220. Verde Valley School | Co-Ed | 9-12 | 126 |
| 221.-222. Hoosac School | Co-Ed | 8-12, PG | 125 |
| 221.-222. Stoneleigh-Burnham School | All-Girls | 7-12, PG | 125 |
| 223.-228. Brandon Hall School | Co-Ed | 4-12, PG | 120 |
| 223.-228. CCI The Renaissance School | Co-Ed | 10-12, PG | 120 |
| 223.-228. Fenster School | Co-Ed | 9-12 | 120 |
| 223.-228. Purnell School | All-Girls | 9-12 | 120 |
| 223.-228. Southwestern Academy | Co-Ed | 7-12, PG | 120 |
| 223.-228. West Nottingham Academy | Co-Ed | 9-12, PG | 120 |
| 229. Grand River Academy | All-Boys | 9-12, PG | 118 |
| 230. The Knox School | Co-Ed | 7-12, PG | 115 |
| 231. High Mowing School | Co-Ed | 9-12 | 112 |
| 232. Darrow School | Co-Ed | 9-12 | 102 |
| 233.-235. Advanced Academy of Georgia | Co-Ed | 11-12 | 100 |
| 233.-235. Besant Hill School (Formerly Happy Valley School) | Co-Ed | 9-12 | 100 |
| 233.-235. The White Mountain School | Co-Ed | 9-12, PG | 100 |
| 236. Buxton School | Co-Ed | 9-12 | 93 |
| 237.-239. The Glenholme School | Co-Ed | 5-12, PG | 90 |
| 237.-239. Sedbergh School | Co-Ed | 7-12 | 90 |
| 237.-239. Venta Preparatory School | Co-Ed | 1-10 | 90 |
| 240.-241. Academy of St. Xavier | All-Boys | 7-12 | 85 |
| 240.-241. Squaw Valley Academy | Co-Ed | 6-12 | 85 |
| 242. Midland School | Co-Ed | 9-12 | 82 |
| 243.-245. The Leelanau School | Co-Ed | 9-12 | 80 |
| 243.-245. Lowell Whiteman School | Co-Ed | 9-12 | 80 |
| 243.-245. Oak Creek Ranch School | Co-Ed | 7-12, PG | 80 |
| 246. Thomas Jefferson School | Co-Ed | 7-12, PG | 78 |
| 247. Oak Ridge Military Academy | Co-Ed | 7-12 | 63 |
| 248. Olney Friends School | Co-Ed | 9-12 | 61 |
| 249.-250. Brenau Academy | All-Girls | 9-12, PG | 60 |
| 249.-250. Oakland School | Co-Ed | 9-12 | 60 |
| 251. Academy of the Holy Family | All-Girls | 9-12, PG | 57 |
| 252.-253. Nawa Academy | Co-Ed | 7-12 | 55 |
| 252.-253. Scattergood Friends School | Co-Ed | 9-12, PG | 55 |
| 254. Oliverian School | Co-Ed | 9-12, PG | 54 |
| 255. Oakdale Christian Academy | Co-Ed | 7-12 | 50 |
| 256. Donahue Academy of Ave Maria | Co-Ed | 11-12 | 49 |
| 257. The Greenwood School | All-Boys | 4-9 | 47 |
| 258. Colorado Timberline Academy | Co-Ed | 9-12, PG | 46 |
| 259. Maharishi Academy of Total Knowledge | All-Boys | 9-12 | 40 |
| 260.-262. Linden Hill School | All-Boys | 3-9 | 30 |
| 260.-262. Lustre Christian High School | Co-Ed | 9-12 | 30 |
| 260.-262. The Meeting School | Co-Ed | 9-12, PG | 30 |
| 263. Hampshire Country School | All-Boys | 3-12 | 25 |
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