Among "All Schools," view the twenty boarding schools with the "lowest teacher:student ratio." First, some important notes:
- Teacher:student ratios are only one indicator of student attention, as they merely indicate the number of adults on campus (in a teacher-related capacacity) relative to the number of students.
- The teacher:student ratio is different than the average class size at a school and should not be confused as such.
| Sorted by range (alphabetically within range) | * Indicates Boarding Grades Offered | ||
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| 1.-2. Southwestern Academy | Co-Ed | 7-12, PG | 1:1 |
| 1.-2. Wentworth Military Academy & College | Co-Ed | 9-12, PG | 1:1 |
| 3.-5. The Greenwood School | All-Boys | 4-9 | 1:2 |
| 3.-5. Hampshire Country School | All-Boys | 3-12 | 1:2 |
| 3.-5. Scattergood Friends School | Co-Ed | 9-12, PG | 1:2 |
| 6.-11. Brandon Hall School | Co-Ed | 4-12, PG | 1:3 |
| 6.-11. The Forman School | Co-Ed | 9-12, PG | 1:3 |
| 6.-11. Landmark School | Co-Ed | 9-12 | 1:3 |
| 6.-11. The Meeting School | Co-Ed | 9-12, PG | 1:3 |
| 6.-11. North Country School | Co-Ed | 4-9 | 1:3 |
| 6.-11. Oliverian School | Co-Ed | 9-12, PG | 1:3 |
| 12.-24. Besant Hill School (Formerly Happy Valley School) | Co-Ed | 9-12 | 1:4 |
| 12.-24. Darrow School | Co-Ed | 9-12 | 1:4 |
| 12.-24. The Gow School | All-Boys | 7-12, PG | 1:4 |
| 12.-24. High Mowing School | Co-Ed | 9-12 | 1:4 |
| 12.-24. Hoosac School | Co-Ed | 8-12, PG | 1:4 |
| 12.-24. Hyde-Woodstock | Co-Ed | 9-12, PG | 1:4 |
| 12.-24. Linden Hill School | All-Boys | 3-9 | 1:4 |
| 12.-24. The Marvelwood School | Co-Ed | 9-12, PG | 1:4 |
| 12.-24. Olney Friends School | Co-Ed | 9-12 | 1:4 |
| Sorted by range (alphabetically within range) | * Indicates Boarding Grades Offered | ||
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| 12.-24. Purnell School | All-Girls | 9-12 | 1:4 |
| 12.-24. The Rectory School | Co-Ed | 5-9 | 1:4 |
| 12.-24. Shawnigan Lake School | Co-Ed | 8-12 | 1:4 |
| 12.-24. The White Mountain School | Co-Ed | 9-12, PG | 1:4 |
| 25.-70. Academy of the Holy Family | All-Girls | 9-12, PG | 1:5 |
| 25.-70. Brooks School | Co-Ed | 9-12 | 1:5 |
| 25.-70. Buxton School | Co-Ed | 9-12 | 1:5 |
| 25.-70. Cardigan Mountain School | All-Boys | 6-9 | 1:5 |
| 25.-70. Cate School | Co-Ed | 9-12 | 1:5 |
| 25.-70. Chapel Hill-Chauncy Hall | Co-Ed | 9-12, PG | 1:5 |
| 25.-70. Christ School | All-Boys | 8-12 | 1:5 |
| 25.-70. Colorado Rocky Mountain School | Co-Ed | 9-12 | 1:5 |
| 25.-70. Colorado Timberline Academy | Co-Ed | 9-12, PG | 1:5 |
| 25.-70. Deerfield Academy | Co-Ed | 9-12, PG | 1:5 |
| 25.-70. Dublin School | Co-Ed | 9-12 | 1:5 |
| 25.-70. Eagle Hill School | Co-Ed | 8-12 | 1:5 |
| 25.-70. Emma Willard School | All-Girls | 9-12, PG | 1:5 |
| 25.-70. The Ethel Walker School | All-Girls | 9-12 | 1:5 |
| 25.-70. Fountain Valley School of Colorado | Co-Ed | 9-12 | 1:5 |
| 25.-70. Grand River Academy | All-Boys | 9-12, PG | 1:5 |
| 25.-70. Groton School | Co-Ed | 8-12 | 1:5 |
| 25.-70. Idyllwild Arts Academy | Co-Ed | 9-12, PG | 1:5 |
| 25.-70. The Loomis Chaffee School | Co-Ed | 9-12, PG | 1:5 |
| 25.-70. Mercersburg Academy | Co-Ed | 9-12, PG | 1:5 |
| 25.-70. Middlesex School | Co-Ed | 9-12 | 1:5 |
| 25.-70. Midland School | Co-Ed | 9-12 | 1:5 |
| 25.-70. Millbrook School | Co-Ed | 9-12, PG | 1:5 |
| 25.-70. Milton Academy | Co-Ed | 9-12 | 1:5 |
| 25.-70. Miss Hall's School | All-Girls | 9-12, PG | 1:5 |
| 25.-70. New Hampton School | Co-Ed | 9-12, PG | 1:5 |
| 25.-70. Oakland School | Co-Ed | 9-12 | 1:5 |
| 25.-70. Oldfields School | All-Girls | 8-12, PG | 1:5 |
| 25.-70. The Phelps School | All-Boys | 7-12, PG | 1:5 |
| 25.-70. Phillips Academy Andover | Co-Ed | 9-12, PG | 1:5 |
| 25.-70. Phillips Exeter Academy | Co-Ed | 9-12, PG | 1:5 |
| 25.-70. Proctor Academy | Co-Ed | 9-12, PG | 1:5 |
| 25.-70. St. Andrew's School - RI | Co-Ed | 9-12 | 1:5 |
| 25.-70. St. Andrew's School, DE | Co-Ed | 9-12 | 1:5 |
| 25.-70. St. George's School | Co-Ed | 9-12 | 1:5 |
| 25.-70. St. Mark's School | Co-Ed | 9-12 | 1:5 |
| 25.-70. St. Paul's School | Co-Ed | 9-12 | 1:5 |
| 25.-70. Salisbury School | All-Boys | 9-12, PG | 1:5 |
| 25.-70. San Domenico School | All-Girls | 9-12 | 1:5 |
| 25.-70. Sedbergh School | Co-Ed | 7-12 | 1:5 |
| 25.-70. South Kent School | All-Boys | 9-12, PG | 1:5 |
| 25.-70. Suffield Academy | Co-Ed | 9-12, PG | 1:5 |
| 25.-70. The Thacher School | Co-Ed | 9-12 | 1:5 |
| 25.-70. Virginia Episcopal School | Co-Ed | 9-12 | 1:5 |
| 25.-70. Westminster School | Co-Ed | 9-12, PG | 1:5 |
| 25.-70. Wolfeboro: The Summer Boarding School | Co-Ed | 6-12, PG | 1:5 |
| 71.-121. Annie Wright School | All-Girls | 9-12 | 1:6 |
| 71.-121. Avon Old Farms School | All-Boys | 9-12, PG | 1:6 |
| 71.-121. Berkshire School | Co-Ed | 9-12, PG | 1:6 |
| 71.-121. Blue Ridge School | All-Boys | 9-12 | 1:6 |
| 71.-121. Brewster Academy | Co-Ed | 9-12, PG | 1:6 |
| 71.-121. The Cambridge School of Weston | Co-Ed | 9-12, PG | 1:6 |
| 71.-121. Canterbury School | Co-Ed | 9-12, PG | 1:6 |
| 71.-121. Choate Rosemary Hall | Co-Ed | 9-12, PG | 1:6 |
| 71.-121. Concord Academy | Co-Ed | 9-12 | 1:6 |
| 71.-121. Episcopal High School | Co-Ed | 9-12 | 1:6 |
| 71.-121. Foxcroft School | All-Girls | 9-12 | 1:6 |
| 71.-121. Gould Academy | Co-Ed | 9-12, PG | 1:6 |
| 71.-121. The Governor's Academy (formerly Governor Dummer Academy) | Co-Ed | 9-12 | 1:6 |
| 71.-121. Grier School | All-Girls | 6-12, PG | 1:6 |
| 71.-121. Hebron Academy | Co-Ed | 9-12, PG | 1:6 |
| 71.-121. Hillside School | All-Boys | 5-9 | 1:6 |
| 71.-121. The Hotchkiss School | Co-Ed | 9-12, PG | 1:6 |
| 71.-121. Hyde-Bath | Co-Ed | 9-12, PG | 1:6 |
| 71.-121. Interlochen Arts Academy | Co-Ed | 9-12, PG | 1:6 |
| 71.-121. Kents Hill School | Co-Ed | 9-12, PG | 1:6 |
| 71.-121. Kimball Union Academy | Co-Ed | 9-12, PG | 1:6 |
| 71.-121. The Knox School | Co-Ed | 7-12, PG | 1:6 |
| 71.-121. Linden Hall | All-Girls | 6-12, PG | 1:6 |
| 71.-121. Lowell Whiteman School | Co-Ed | 9-12 | 1:6 |
| 71.-121. Lustre Christian High School | Co-Ed | 9-12 | 1:6 |
| 71.-121. The MacDuffie School | Co-Ed | 9-12 | 1:6 |
| 71.-121. The Madeira School | All-Girls | 9-12 | 1:6 |
| 71.-121. The Masters School | Co-Ed | 9-12 | 1:6 |
| 71.-121. Miller School | Co-Ed | 8-12, PG | 1:6 |
| 71.-121. Northwood School | Co-Ed | 9-12, PG | 1:6 |
| 71.-121. Oak Creek Ranch School | Co-Ed | 7-12, PG | 1:6 |
| 71.-121. Oakwood Friends School | Co-Ed | 9-12 | 1:6 |
| 71.-121. Ojai Valley School | Co-Ed | 3-12 | 1:6 |
| 71.-121. Peddie School | Co-Ed | 9-12, PG | 1:6 |
| 71.-121. Pomfret School | Co-Ed | 9-12, PG | 1:6 |
| 71.-121. The Putney School | Co-Ed | 9-12, PG | 1:6 |
| 71.-121. St. Margaret's School | All-Girls | 8-12 | 1:6 |
| 71.-121. St. Timothy's School | All-Girls | 9-12, PG | 1:6 |
| 71.-121. Solebury School | Co-Ed | 9-12 | 1:6 |
| 71.-121. Squaw Valley Academy | Co-Ed | 6-12 | 1:6 |
| 71.-121. Stoneleigh-Burnham School | All-Girls | 7-12, PG | 1:6 |
| 71.-121. Tabor Academy | Co-Ed | 9-12 | 1:6 |
| 71.-121. The Taft School | Co-Ed | 9-12, PG | 1:6 |
| 71.-121. Thomas Jefferson School | Co-Ed | 7-12, PG | 1:6 |
| 71.-121. Tilton School | Co-Ed | 9-12, PG | 1:6 |
| 71.-121. Venta Preparatory School | Co-Ed | 1-10 | 1:6 |
| 71.-121. Verde Valley School | Co-Ed | 9-12 | 1:6 |
| 71.-121. Wayland Academy | Co-Ed | 9-12 | 1:6 |
| 71.-121. Western Reserve Academy | Co-Ed | 9-12, PG | 1:6 |
| 71.-121. The Winchendon School | Co-Ed | 9-12, PG | 1:6 |
| 71.-121. Woodberry Forest School | All-Boys | 9-12 | 1:6 |
| 122.-166. Academy of St. Xavier | All-Boys | 7-12 | 1:7 |
| 122.-166. Asheville School | Co-Ed | 9-12 | 1:7 |
| 122.-166. Blair Academy | Co-Ed | 9-12, PG | 1:7 |
| 122.-166. CFS, The School at Church Farm | All-Boys | 7-12 | 1:7 |
| 122.-166. Chatham Hall | All-Girls | 9-12 | 1:7 |
| 122.-166. Cheshire Academy | Co-Ed | 9-12, PG | 1:7 |
| 122.-166. Christchurch School | All-Boys | 9-12, PG | 1:7 |
| 122.-166. Country Day School, Costa Rica | Co-Ed | 8-12 | 1:7 |
| 122.-166. The Delphian School | Co-Ed | 3-12 | 1:7 |
| 122.-166. Dunn School | Co-Ed | 9-12 | 1:7 |
| 122.-166. Fay School | Co-Ed | 6-9 | 1:7 |
| 122.-166. Fenster School | Co-Ed | 9-12 | 1:7 |
| 122.-166. Fishburne Military School | All-Boys | 7-12, PG | 1:7 |
| 122.-166. George School | Co-Ed | 9-12 | 1:7 |
| 122.-166. The Gunnery | Co-Ed | 9-12, PG | 1:7 |
| 122.-166. Hill School | Co-Ed | 9-12, PG | 1:7 |
| 122.-166. Holderness School | Co-Ed | 9-12, PG | 1:7 |
| 122.-166. The Kiski School | All-Boys | 9-12, PG | 1:7 |
| 122.-166. La Lumiere School | Co-Ed | 9-12, PG | 1:7 |
| 122.-166. Lake Forest Academy | Co-Ed | 9-12, PG | 1:7 |
| 122.-166. Lawrence Academy | Co-Ed | 9-12 | 1:7 |
| 122.-166. Leysin American School in Switzerland (LAS) | Co-Ed | 8-12, PG | 1:7 |
| 122.-166. Nawa Academy | Co-Ed | 7-12 | 1:7 |
| 122.-166. Northfield Mount Hermon School | Co-Ed | 9-12, PG | 1:7 |
| 122.-166. Oak Ridge Military Academy | Co-Ed | 7-12 | 1:7 |
| 122.-166. Oakdale Christian Academy | Co-Ed | 7-12 | 1:7 |
| 122.-166. Oregon Episcopal School | Co-Ed | 9-12 | 1:7 |
| 122.-166. Perkiomen School | Co-Ed | 7-12, PG | 1:7 |
| 122.-166. Portsmouth Abbey School | Co-Ed | 9-12 | 1:7 |
| 122.-166. Rothesay Netherwood School | Co-Ed | 6-12 | 1:7 |
| 122.-166. St. Albans School | All-Boys | 9-12 | 1:7 |
| 122.-166. St. Andrew's-Sewanee School | Co-Ed | 9-12 | 1:7 |
| 122.-166. St. Anne's-Belfield School | Co-Ed | 9-12 | 1:7 |
| 122.-166. St. Stephen's Episcopal School | Co-Ed | 8-12 | 1:7 |
| 122.-166. St. Thomas More School | All-Boys | 8-12, PG | 1:7 |
| 122.-166. Salem Academy | All-Girls | 9-12 | 1:7 |
| 122.-166. Santa Catalina School | All-Girls | 9-12 | 1:7 |
| 122.-166. The Storm King School | Co-Ed | 8-12 | 1:7 |
| 122.-166. TMI -The Episcopal School of Texas | Co-Ed | 8-12 | 1:7 |
| 122.-166. Vermont Academy | Co-Ed | 9-12, PG | 1:7 |
| 122.-166. The Webb Schools | Co-Ed | 9-12 | 1:7 |
| 122.-166. West Nottingham Academy | Co-Ed | 9-12, PG | 1:7 |
| 122.-166. Westtown School | Co-Ed | 9-12 | 1:7 |
| 122.-166. Wilbraham & Monson Academy | Co-Ed | 9-12, PG | 1:7 |
| 122.-166. The Williston Northampton School | Co-Ed | 9-12, PG | 1:7 |
| 167.-198. Baylor School | Co-Ed | 9-12 | 1:8 |
| 167.-198. Brenau Academy | All-Girls | 9-12, PG | 1:8 |
| 167.-198. Camden Military Academy | All-Boys | 7-12, PG | 1:8 |
| 167.-198. Carson Long Military Institute | All-Boys | 6-12 | 1:8 |
| 167.-198. CCI The Renaissance School | Co-Ed | 10-12, PG | 1:8 |
| 167.-198. Cranbrook Schools | Co-Ed | 9-12 | 1:8 |
| 167.-198. Cushing Academy | Co-Ed | 9-12, PG | 1:8 |
| 167.-198. Georgetown Preparatory School | All-Boys | 9-12 | 1:8 |
| 167.-198. Havergal College | All-Girls | 9-12 | 1:8 |
| 167.-198. Howe Military School & Summer Camp | Co-Ed | 5-12 | 1:8 |
| 167.-198. The Hun School of Princeton | Co-Ed | 9-12, PG | 1:8 |
| 167.-198. Indian Springs School | Co-Ed | 9-12 | 1:8 |
| 167.-198. Kent School | Co-Ed | 9-12, PG | 1:8 |
| 167.-198. Lawrenceville School | Co-Ed | 9-12, PG | 1:8 |
| 167.-198. The Leelanau School | Co-Ed | 9-12 | 1:8 |
| 167.-198. The Linsly School | Co-Ed | 7-12 | 1:8 |
| 167.-198. Maharishi Academy of Total Knowledge | All-Boys | 9-12 | 1:8 |
| 167.-198. Massanutten Military Academy | Co-Ed | 7-12, PG | 1:8 |
| 167.-198. Miss Porter's School | All-Girls | 9-12 | 1:8 |
| 167.-198. North Broward Preparatory School | Co-Ed | 7-12 | 1:8 |
| 167.-198. The Pennington School | Co-Ed | 7-12 | 1:8 |
| 167.-198. Rabun Gap-Nacoochee School | Co-Ed | 7-12 | 1:8 |
| 167.-198. Rosseau Lake College | Co-Ed | 7-12, PG | 1:8 |
| 167.-198. St. Johnsbury Academy | Co-Ed | 9-12, PG | 1:8 |
| 167.-198. Saint Mary's School | All-Girls | 9-12 | 1:8 |
| 167.-198. San Marcos Baptist Academy | Co-Ed | 7-12 | 1:8 |
| 167.-198. Stanstead College | Co-Ed | 7-12 | 1:8 |
| 167.-198. The Stony Brook School | Co-Ed | 7-12 | 1:8 |
| 167.-198. TASIS The American School in England | Co-Ed | 9-12, PG | 1:8 |
| 167.-198. Trinity Pawling School | All-Boys | 9-12, PG | 1:8 |
| 167.-198. The Webb School | Co-Ed | 7-12, PG | 1:8 |
| 167.-198. Westover School | All-Girls | 9-12 | 1:8 |
| 199.-213. Ashbury College | Co-Ed | 9-12 | 1:9 |
| 199.-213. Bridgton Academy | All-Boys | 12-12, PG | 1:9 |
| 199.-213. Culver Academies | Co-Ed | 9-12 | 1:9 |
| 199.-213. Dana Hall School | All-Girls | 9-12 | 1:9 |
| 199.-213. Garrison Forest School | All-Girls | 8-12 | 1:9 |
| 199.-213. Hawaii Preparatory Academy | Co-Ed | 6-12, PG | 1:9 |
| 199.-213. McCallie School | All-Boys | 9-12 | 1:9 |
| 199.-213. Randolph-Macon Academy | Co-Ed | 6-12, PG | 1:9 |
| 199.-213. St. Andrew's College | All-Boys | 6-12 | 1:9 |
| 199.-213. Saint Andrew's School | Co-Ed | 9-12 | 1:9 |
| 199.-213. St. Catherine's Military Academy | All-Boys | 4-8 | 1:9 |
| 199.-213. Saint James School | Co-Ed | 8-12 | 1:9 |
| 199.-213. Shattuck-St. Mary's School | Co-Ed | 6-12, PG | 1:9 |
| 199.-213. Subiaco Academy | All-Boys | 7-12 | 1:9 |
| 199.-213. Woodside Priory School (The Priory) | Co-Ed | 9-12 | 1:9 |
| 214.-233. Admiral Farragut Academy | Co-Ed | 6-12 | 1:10 |
| 214.-233. The Athenian School | Co-Ed | 9-12 | 1:10 |
| 214.-233. The Bolles School | Co-Ed | 7-12, PG | 1:10 |
| 214.-233. The Brook Hill School | Co-Ed | 8-12 | 1:10 |
| 214.-233. Buffalo Seminary | All-Girls | 9-12 | 1:10 |
| 214.-233. Donahue Academy of Ave Maria | Co-Ed | 11-12 | 1:10 |
| 214.-233. Flintridge Sacred Heart Academy | All-Girls | 9-12 | 1:10 |
| 214.-233. Fork Union Military Academy | All-Boys | 6-12, PG | 1:10 |
| 214.-233. Foxcroft Academy | Co-Ed | 9-12, PG | 1:10 |
| 214.-233. Fryeburg Academy | Co-Ed | 9-12, PG | 1:10 |
| 214.-233. George Stevens Academy | Co-Ed | 9-12 | 1:10 |
| 214.-233. The Hockaday School | All-Girls | 8-12 | 1:10 |
| 214.-233. Oak Hill Academy | Co-Ed | 8-12 | 1:10 |
| 214.-233. Ridley College | Co-Ed | Pre-K-12, PG | 1:10 |
| 214.-233. Riverside Military Academy | All-Boys | 7-12 | 1:10 |
| 214.-233. St. John's Northwestern Military Academy | All-Boys | 7-12, PG | 1:10 |
| 214.-233. Stevenson School | Co-Ed | 9-12 | 1:10 |
| 214.-233. Stuart Hall School | Co-Ed | 8-12 | 1:10 |
| 214.-233. Wasatch Academy | Co-Ed | 9-12, PG | 1:10 |
| 214.-233. Wyoming Seminary Upper School | Co-Ed | 9-12, PG | 1:10 |
| 234.-239. Brentwood College School | Co-Ed | 9-12, PG | 1:11 |
| 234.-239. Hargrave Military Academy | All-Boys | 7-12, PG | 1:11 |
| 234.-239. The King's Academy | Co-Ed | 7-12 | 1:11 |
| 234.-239. Missouri Military Academy | All-Boys | 6-12, PG | 1:11 |
| 234.-239. Saint John's Preparatory School | Co-Ed | 9-12, PG | 1:11 |
| 234.-239. Washington Academy | Co-Ed | 9-12, PG | 1:11 |
| 240.-248. Andrews Osborne Academy | Co-Ed | 7-12 | 1:12 |
| 240.-248. The Bishop Strachan School | All-Girls | 7-12 | 1:12 |
| 240.-248. The Glenholme School | Co-Ed | 5-12, PG | 1:12 |
| 240.-248. Monte Vista Christian School | Co-Ed | 9-12 | 1:12 |
| 240.-248. New Mexico Military Institute | Co-Ed | 9-12, PG | 1:12 |
| 240.-248. New York Military Academy | Co-Ed | 7-12, PG | 1:12 |
| 240.-248. Tallulah Falls School | Co-Ed | 7-12 | 1:12 |
| 240.-248. Valley Forge Military Academy | All-Boys | 7-12, PG | 1:12 |
| 240.-248. Villanova Preparatory School | Co-Ed | 9-12 | 1:12 |
| 249.-250. Darlington School | Co-Ed | 9-12, PG | 1:13 |
| 249.-250. Florida Air Academy | Co-Ed | 6-12 | 1:13 |
| 251. Carlisle School | Co-Ed | 9-12 | 1:14 |
| 252.-255. Army and Navy Academy | All-Boys | 7-12 | 1:15 |
| 252.-255. EduKick Academic Soccer (Sports) Boarding School Academies | Co-Ed | 8-12, PG | 1:15 |
| 252.-255. The Orme School of Arizona | Co-Ed | 8-12, PG | 1:15 |
| 252.-255. St. Croix Schools | Co-Ed | 6-12, PG | 1:15 |
| 256.-257. Bronte College of Canada | Co-Ed | 9-12, PG | 1:16 |
| 256.-257. Houghton Academy | Co-Ed | 9-12, PG | 1:16 |
| 258. St. Michaels University School | Co-Ed | 8-12 | 1:18 |
| 259. Thornton Academy | Co-Ed | 9-12 | 1:19 |
| 260.-261. Advanced Academy of Georgia | Co-Ed | 11-12 | 1:20 |
| 260.-261. Montverde Academy | Co-Ed | 7-12, PG | 1:20 |
| 262. Family First Academy | Co-Ed | 8-12 | 1:23 |
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