Among "All Schools," view the twenty boarding schools with the "oldest founding date." First, some important notes:
- The "founding dates" below are the dates that schools have traditionally listed as the official year of their founding.
- Note that the definition of "founding date" may differ slightly from school to school (e.g., whether it selects the year the school first received its charter or the year it first admitted students - regardless, the differences between the two are often small)
| Sorted by range (alphabetically within range) | * Indicates Boarding Grades Offered | ||
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| 1. West Nottingham Academy | Co-Ed | 9-12, PG | 1744 |
| 2. Linden Hall | All-Girls | 6-12, PG | 1746 |
| 3. The Governor's Academy (formerly Governor Dummer Academy) | Co-Ed | 9-12 | 1763 |
| 4. Salem Academy | All-Girls | 9-12 | 1772 |
| 5. Phillips Academy Andover | Co-Ed | 9-12, PG | 1778 |
| 6. Phillips Exeter Academy | Co-Ed | 9-12, PG | 1781 |
| 7. Georgetown Preparatory School | All-Boys | 9-12 | 1789 |
| 8.-9. Fryeburg Academy | Co-Ed | 9-12, PG | 1792 |
| 8.-9. Washington Academy | Co-Ed | 9-12, PG | 1792 |
| 10. Lawrence Academy | Co-Ed | 9-12 | 1793 |
| 11. Cheshire Academy | Co-Ed | 9-12, PG | 1794 |
| 12. Oakwood Friends School | Co-Ed | 9-12 | 1796 |
| 13. Deerfield Academy | Co-Ed | 9-12, PG | 1797 |
| 14. Milton Academy | Co-Ed | 9-12 | 1798 |
| 15. Westtown School | Co-Ed | 9-12 | 1799 |
| 16. George Stevens Academy | Co-Ed | 9-12 | 1803 |
| 17.-18. Hebron Academy | Co-Ed | 9-12, PG | 1804 |
| 17.-18. Wilbraham & Monson Academy | Co-Ed | 9-12, PG | 1804 |
| 19. Bridgton Academy | All-Boys | 12-12, PG | 1808 |
| 20. Lawrenceville School | Co-Ed | 9-12, PG | 1810 |
| Sorted by range (alphabetically within range) | * Indicates Boarding Grades Offered | ||
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| 21. Thornton Academy | Co-Ed | 9-12 | 1811 |
| 22. Kimball Union Academy | Co-Ed | 9-12, PG | 1813 |
| 23.-24. Emma Willard School | All-Girls | 9-12, PG | 1814 |
| 23.-24. The Linsly School | Co-Ed | 7-12 | 1814 |
| 25. Brewster Academy | Co-Ed | 9-12, PG | 1820 |
| 26. New Hampton School | Co-Ed | 9-12, PG | 1821 |
| 27. Foxcroft Academy | Co-Ed | 9-12, PG | 1823 |
| 28. Kents Hill School | Co-Ed | 9-12, PG | 1824 |
| 29. Western Reserve Academy | Co-Ed | 9-12, PG | 1826 |
| 30. Chapel Hill-Chauncy Hall | Co-Ed | 9-12, PG | 1828 |
| 31. Grand River Academy | All-Boys | 9-12, PG | 1831 |
| 32. Suffield Academy | Co-Ed | 9-12, PG | 1833 |
| 33. Gould Academy | Co-Ed | 9-12, PG | 1836 |
| 34. Olney Friends School | Co-Ed | 9-12 | 1837 |
| 35. The Pennington School | Co-Ed | 7-12 | 1838 |
| 36. Episcopal High School | Co-Ed | 9-12 | 1839 |
| 37. The Williston Northampton School | Co-Ed | 9-12, PG | 1841 |
| 38.-41. Carson Long Military Institute | All-Boys | 6-12 | 1842 |
| 38.-41. Saint James School | Co-Ed | 8-12 | 1842 |
| 38.-41. St. Johnsbury Academy | Co-Ed | 9-12, PG | 1842 |
| 38.-41. Saint Mary's School | All-Girls | 9-12 | 1842 |
| 42. Miss Porter's School | All-Girls | 9-12 | 1843 |
| 43.-44. Stuart Hall School | Co-Ed | 8-12 | 1844 |
| 43.-44. Wyoming Seminary Upper School | Co-Ed | 9-12, PG | 1844 |
| 45. Tilton School | Co-Ed | 9-12, PG | 1845 |
| 46.-47. Blair Academy | Co-Ed | 9-12, PG | 1848 |
| 46.-47. Proctor Academy | Co-Ed | 9-12, PG | 1848 |
| 48.-49. The Gunnery | Co-Ed | 9-12, PG | 1850 |
| 48.-49. San Domenico School | All-Girls | 9-12 | 1850 |
| 50.-51. Buffalo Seminary | All-Girls | 9-12 | 1851 |
| 50.-51. Hill School | Co-Ed | 9-12, PG | 1851 |
| 52. Oak Ridge Military Academy | Co-Ed | 7-12 | 1852 |
| 53. Grier School | All-Girls | 6-12, PG | 1853 |
| 54. St. Stanislaus College | All-Boys | 7-12 | 1854 |
| 55. Wayland Academy | Co-Ed | 9-12 | 1855 |
| 56. St. Paul's School | Co-Ed | 9-12 | 1856 |
| 57.-58. Lake Forest Academy | Co-Ed | 9-12, PG | 1857 |
| 57.-58. Saint John's Preparatory School | Co-Ed | 9-12, PG | 1857 |
| 59. Shattuck-St. Mary's School | Co-Ed | 6-12, PG | 1858 |
| 60. Peddie School | Co-Ed | 9-12, PG | 1864 |
| 61.-62. Cushing Academy | Co-Ed | 9-12, PG | 1865 |
| 61.-62. St. Mark's School | Co-Ed | 9-12 | 1865 |
| 63. Fay School | Co-Ed | 6-9 | 1866 |
| 64.-66. The Bishop Strachan School | All-Girls | 7-12 | 1867 |
| 64.-66. Oldfields School | All-Girls | 8-12, PG | 1867 |
| 64.-66. The Storm King School | Co-Ed | 8-12 | 1867 |
| 67. St. Andrew's-Sewanee School | Co-Ed | 9-12 | 1868 |
| 68.-69. Oregon Episcopal School | Co-Ed | 9-12 | 1869 |
| 68.-69. Stoneleigh-Burnham School | All-Girls | 7-12, PG | 1869 |
| 70. The Webb School | Co-Ed | 7-12, PG | 1870 |
| 71. Stanstead College | Co-Ed | 7-12 | 1872 |
| 72.-73. Academy of the Holy Family | All-Girls | 9-12, PG | 1874 |
| 72.-73. The Loomis Chaffee School | Co-Ed | 9-12, PG | 1874 |
| 74.-75. Perkiomen School | Co-Ed | 7-12, PG | 1875 |
| 74.-75. Wasatch Academy | Co-Ed | 9-12, PG | 1875 |
| 76.-77. Tabor Academy | Co-Ed | 9-12 | 1876 |
| 76.-77. Vermont Academy | Co-Ed | 9-12, PG | 1876 |
| 78.-79. The Masters School | Co-Ed | 9-12 | 1877 |
| 78.-79. Rothesay Netherwood School | Co-Ed | 6-12 | 1877 |
| 80.-81. Miller School | Co-Ed | 8-12, PG | 1878 |
| 80.-81. Oak Hill Academy | Co-Ed | 8-12 | 1878 |
| 82.-84. Fishburne Military School | All-Boys | 7-12, PG | 1879 |
| 82.-84. Holderness School | Co-Ed | 9-12, PG | 1879 |
| 82.-84. Northfield Mount Hermon School | Co-Ed | 9-12, PG | 1879 |
| 85.-86. The King's Academy | Co-Ed | 7-12 | 1880 |
| 85.-86. Wentworth Military Academy & College | Co-Ed | 9-12, PG | 1880 |
| 87. Dana Hall School | All-Girls | 9-12 | 1881 |
| 88. St. Timothy's School | All-Girls | 9-12, PG | 1882 |
| 89. Houghton Academy | Co-Ed | 9-12, PG | 1883 |
| 90.-93. Annie Wright School | All-Girls | 9-12 | 1884 |
| 90.-93. Groton School | Co-Ed | 8-12 | 1884 |
| 90.-93. Howe Military School & Summer Camp | Co-Ed | 5-12 | 1884 |
| 90.-93. St. John's Northwestern Military Academy | All-Boys | 7-12, PG | 1884 |
| 94.-95. The Cambridge School of Weston | Co-Ed | 9-12, PG | 1886 |
| 94.-95. The White Mountain School | Co-Ed | 9-12, PG | 1886 |
| 96. Subiaco Academy | All-Boys | 7-12 | 1887 |
| 97.-98. The Kiski School | All-Boys | 9-12, PG | 1888 |
| 97.-98. Westminster School | Co-Ed | 9-12, PG | 1888 |
| 99.-105. Hoosac School | Co-Ed | 8-12, PG | 1889 |
| 99.-105. Missouri Military Academy | All-Boys | 6-12, PG | 1889 |
| 99.-105. New York Military Academy | Co-Ed | 7-12, PG | 1889 |
| 99.-105. Ridley College | Co-Ed | Pre-K-12, PG | 1889 |
| 99.-105. St. Catherine's Military Academy | All-Boys | 4-8 | 1889 |
| 99.-105. The Thacher School | Co-Ed | 9-12 | 1889 |
| 99.-105. Woodberry Forest School | All-Boys | 9-12 | 1889 |
| 106.-109. Choate Rosemary Hall | Co-Ed | 9-12, PG | 1890 |
| 106.-109. The MacDuffie School | Co-Ed | 9-12 | 1890 |
| 106.-109. Scattergood Friends School | Co-Ed | 9-12, PG | 1890 |
| 106.-109. The Taft School | Co-Ed | 9-12, PG | 1890 |
| 110.-112. Ashbury College | Co-Ed | 9-12 | 1891 |
| 110.-112. The Hotchkiss School | Co-Ed | 9-12, PG | 1891 |
| 110.-112. New Mexico Military Institute | Co-Ed | 9-12, PG | 1891 |
| 113.-114. Camden Military Academy | All-Boys | 7-12, PG | 1892 |
| 113.-114. Randolph-Macon Academy | Co-Ed | 6-12, PG | 1892 |
| 115.-119. Baylor School | Co-Ed | 9-12 | 1893 |
| 115.-119. George School | Co-Ed | 9-12 | 1893 |
| 115.-119. Mercersburg Academy | Co-Ed | 9-12, PG | 1893 |
| 115.-119. St. Andrew's School - RI | Co-Ed | 9-12 | 1893 |
| 115.-119. TMI -The Episcopal School of Texas | Co-Ed | 8-12 | 1893 |
| 120.-123. Chatham Hall | All-Girls | 9-12 | 1894 |
| 120.-123. Culver Academies | Co-Ed | 9-12 | 1894 |
| 120.-123. Havergal College | All-Girls | 9-12 | 1894 |
| 120.-123. Pomfret School | Co-Ed | 9-12, PG | 1894 |
| 124. St. George's School | Co-Ed | 9-12 | 1896 |
| 125.-126. Fork Union Military Academy | All-Boys | 6-12, PG | 1898 |
| 125.-126. Miss Hall's School | All-Girls | 9-12, PG | 1898 |
| 127.-128. Massanutten Military Academy | Co-Ed | 7-12, PG | 1899 |
| 127.-128. St. Andrew's College | All-Boys | 6-12 | 1899 |
| 129.-130. Asheville School | Co-Ed | 9-12 | 1900 |
| 129.-130. Christ School | All-Boys | 8-12 | 1900 |
| 131.-133. Hillside School | All-Boys | 5-9 | 1901 |
| 131.-133. Middlesex School | Co-Ed | 9-12 | 1901 |
| 131.-133. Salisbury School | All-Boys | 9-12, PG | 1901 |
| 134. Rabun Gap-Nacoochee School | Co-Ed | 7-12 | 1903 |
| 135. The Knox School | Co-Ed | 7-12, PG | 1904 |
| 136.-138. Darlington School | Co-Ed | 9-12, PG | 1905 |
| 136.-138. McCallie School | All-Boys | 9-12 | 1905 |
| 136.-138. Northwood School | Co-Ed | 9-12, PG | 1905 |
| 139.-141. Kent School | Co-Ed | 9-12, PG | 1906 |
| 139.-141. The Madeira School | All-Girls | 9-12 | 1906 |
| 139.-141. St. Michaels University School | Co-Ed | 8-12 | 1906 |
| 142.-145. Berkshire School | Co-Ed | 9-12, PG | 1907 |
| 142.-145. Riverside Military Academy | All-Boys | 7-12 | 1907 |
| 142.-145. San Marcos Baptist Academy | Co-Ed | 7-12 | 1907 |
| 142.-145. Trinity Pawling School | All-Boys | 9-12, PG | 1907 |
| 146.-150. Blue Ridge School | All-Boys | 9-12 | 1909 |
| 146.-150. Hargrave Military Academy | All-Boys | 7-12, PG | 1909 |
| 146.-150. St. Albans School | All-Boys | 9-12 | 1909 |
| 146.-150. Tallulah Falls School | Co-Ed | 7-12 | 1909 |
| 146.-150. Westover School | All-Girls | 9-12 | 1909 |
| 151.-156. Andrews Osborne Academy | Co-Ed | 7-12 | 1910 |
| 151.-156. Army and Navy Academy | All-Boys | 7-12 | 1910 |
| 151.-156. Cate School | Co-Ed | 9-12 | 1910 |
| 151.-156. Garrison Forest School | All-Girls | 8-12 | 1910 |
| 151.-156. St. Anne's-Belfield School | Co-Ed | 9-12 | 1910 |
| 151.-156. Wolfeboro: The Summer Boarding School | Co-Ed | 6-12, PG | 1910 |
| 157.-159. Cotter Schools | Co-Ed | 9-12, PG | 1911 |
| 157.-159. The Ethel Walker School | All-Girls | 9-12 | 1911 |
| 157.-159. Ojai Valley School | Co-Ed | 3-12 | 1911 |
| 160. Montverde Academy | Co-Ed | 7-12, PG | 1912 |
| 161. The Hockaday School | All-Girls | 8-12 | 1913 |
| 162.-163. Foxcroft School | All-Girls | 9-12 | 1914 |
| 162.-163. The Hun School of Princeton | Co-Ed | 9-12, PG | 1914 |
| 164. Canterbury School | Co-Ed | 9-12, PG | 1915 |
| 165.-166. Shawnigan Lake School | Co-Ed | 8-12 | 1916 |
| 165.-166. Virginia Episcopal School | Co-Ed | 9-12 | 1916 |
| 167. CFS, The School at Church Farm | All-Boys | 7-12 | 1918 |
| 168. The Rectory School | Co-Ed | 5-9 | 1920 |
| 169.-171. Christchurch School | All-Boys | 9-12, PG | 1921 |
| 169.-171. Oakdale Christian Academy | Co-Ed | 7-12 | 1921 |
| 169.-171. St. Margaret's School | All-Girls | 8-12 | 1921 |
| 172.-175. Concord Academy | Co-Ed | 9-12 | 1922 |
| 172.-175. Cranbrook Schools | Co-Ed | 9-12 | 1922 |
| 172.-175. The Stony Brook School | Co-Ed | 7-12 | 1922 |
| 172.-175. The Webb Schools | Co-Ed | 9-12 | 1922 |
| 176.-177. Brentwood College School | Co-Ed | 9-12, PG | 1923 |
| 176.-177. South Kent School | All-Boys | 9-12, PG | 1923 |
| 178.-179. Southwestern Academy | Co-Ed | 7-12, PG | 1924 |
| 178.-179. Villanova Preparatory School | Co-Ed | 9-12 | 1924 |
| 180.-181. Bement School | Co-Ed | 3-9 | 1925 |
| 180.-181. Solebury School | Co-Ed | 9-12 | 1925 |
| 182.-186. Brooks School | Co-Ed | 9-12 | 1926 |
| 182.-186. The Gow School | All-Boys | 7-12, PG | 1926 |
| 182.-186. Monte Vista Christian School | Co-Ed | 9-12 | 1926 |
| 182.-186. Portsmouth Abbey School | Co-Ed | 9-12 | 1926 |
| 182.-186. The Winchendon School | Co-Ed | 9-12, PG | 1926 |
| 187. Avon Old Farms School | All-Boys | 9-12, PG | 1927 |
| 188.-191. Brenau Academy | All-Girls | 9-12, PG | 1928 |
| 188.-191. Buxton School | Co-Ed | 9-12 | 1928 |
| 188.-191. Interlochen Arts Academy | Co-Ed | 9-12, PG | 1928 |
| 188.-191. Valley Forge Military Academy | All-Boys | 7-12, PG | 1928 |
| 192.-194. The Leelanau School | Co-Ed | 9-12 | 1929 |
| 192.-194. The Orme School of Arizona | Co-Ed | 8-12, PG | 1929 |
| 192.-194. St. Andrew's School, DE | Co-Ed | 9-12 | 1929 |
| 195.-196. The Forman School | Co-Ed | 9-12, PG | 1930 |
| 195.-196. Fountain Valley School of Colorado | Co-Ed | 9-12 | 1930 |
| 197.-198. Flintridge Sacred Heart Academy | All-Girls | 9-12 | 1931 |
| 197.-198. Millbrook School | Co-Ed | 9-12, PG | 1931 |
| 199.-200. Darrow School | Co-Ed | 9-12 | 1932 |
| 199.-200. Midland School | Co-Ed | 9-12 | 1932 |
| 201.-202. Admiral Farragut Academy | Co-Ed | 6-12 | 1933 |
| 201.-202. The Bolles School | Co-Ed | 7-12, PG | 1933 |
| 203.-204. Dublin School | Co-Ed | 9-12 | 1935 |
| 203.-204. The Putney School | Co-Ed | 9-12, PG | 1935 |
| 205. North Country School | Co-Ed | 4-9 | 1938 |
| 206. Sedbergh School | Co-Ed | 7-12 | 1939 |
| 207. High Mowing School | Co-Ed | 9-12 | 1942 |
| 208. Fenster School | Co-Ed | 9-12 | 1944 |
| 209. Cardigan Mountain School | All-Boys | 6-9 | 1945 |
| 210.-212. Besant Hill School (Formerly Happy Valley School) | Co-Ed | 9-12 | 1946 |
| 210.-212. The Phelps School | All-Boys | 7-12, PG | 1946 |
| 210.-212. Thomas Jefferson School | Co-Ed | 7-12, PG | 1946 |
| 213.-214. Hampshire Country School | All-Boys | 3-12 | 1948 |
| 213.-214. Verde Valley School | Co-Ed | 9-12 | 1948 |
| 215.-216. Hawaii Preparatory Academy | Co-Ed | 6-12, PG | 1949 |
| 215.-216. Lustre Christian High School | Co-Ed | 9-12 | 1949 |
| 217.-219. Oakland School | Co-Ed | 9-12 | 1950 |
| 217.-219. St. Stephen's Episcopal School | Co-Ed | 8-12 | 1950 |
| 217.-219. Santa Catalina School | All-Girls | 9-12 | 1950 |
| 220.-221. Indian Springs School | Co-Ed | 9-12 | 1952 |
| 220.-221. Stevenson School | Co-Ed | 9-12 | 1952 |
| 222. Colorado Rocky Mountain School | Co-Ed | 9-12 | 1953 |
| 223. The Marvelwood School | Co-Ed | 9-12, PG | 1956 |
| 224.-228. Dunn School | Co-Ed | 9-12 | 1957 |
| 224.-228. Lowell Whiteman School | Co-Ed | 9-12 | 1957 |
| 224.-228. The Meeting School | Co-Ed | 9-12, PG | 1957 |
| 224.-228. North Broward Preparatory School | Co-Ed | 7-12 | 1957 |
| 224.-228. Woodside Priory School (The Priory) | Co-Ed | 9-12 | 1957 |
| 229. St. Croix Schools | Co-Ed | 6-12, PG | 1958 |
| 230. Brandon Hall School | Co-Ed | 4-12, PG | 1959 |
| 231.-234. Florida Air Academy | Co-Ed | 6-12 | 1961 |
| 231.-234. Leysin American School in Switzerland (LAS) | Co-Ed | 8-12, PG | 1961 |
| 231.-234. Linden Hill School | All-Boys | 3-9 | 1961 |
| 231.-234. Saint Andrew's School | Co-Ed | 9-12 | 1961 |
| 235. St. Thomas More School | All-Boys | 8-12, PG | 1962 |
| 236.-237. La Lumiere School | Co-Ed | 9-12, PG | 1963 |
| 236.-237. Purnell School | All-Girls | 9-12 | 1963 |
| 238. The Athenian School | Co-Ed | 9-12 | 1965 |
| 239. Hyde-Bath | Co-Ed | 9-12, PG | 1966 |
| 240.-241. Eagle Hill School | Co-Ed | 8-12 | 1967 |
| 240.-241. Rosseau Lake College | Co-Ed | 7-12, PG | 1967 |
| 242.-243. Carlisle School | Co-Ed | 9-12 | 1968 |
| 242.-243. The Glenholme School | Co-Ed | 5-12, PG | 1968 |
| 244. Landmark School | Co-Ed | 9-12 | 1971 |
| 245. Oak Creek Ranch School | Co-Ed | 7-12, PG | 1972 |
| 246. Colorado Timberline Academy | Co-Ed | 9-12, PG | 1975 |
| 247.-248. The Delphian School | Co-Ed | 3-12 | 1976 |
| 247.-248. TASIS The American School in England | Co-Ed | 9-12, PG | 1976 |
| 249.-250. The Greenwood School | All-Boys | 4-9 | 1978 |
| 249.-250. Squaw Valley Academy | Co-Ed | 6-12 | 1978 |
| 251. Venta Preparatory School | Co-Ed | 1-10 | 1981 |
| 252. Idyllwild Arts Academy | Co-Ed | 9-12, PG | 1986 |
| 253. Nawa Academy | Co-Ed | 7-12 | 1988 |
| 254.-255. Bronte College of Canada | Co-Ed | 9-12, PG | 1991 |
| 254.-255. Ross School | Co-Ed | 8-12 | 1991 |
| 256. Family First Academy | Co-Ed | 8-12 | 1993 |
| 257.-258. Advanced Academy of Georgia | Co-Ed | 11-12 | 1995 |
| 257.-258. CCI The Renaissance School | Co-Ed | 10-12, PG | 1995 |
| 259. Hyde-Woodstock | Co-Ed | 9-12, PG | 1996 |
| 260. The Brook Hill School | Co-Ed | 8-12 | 1997 |
| 261. Country Day School, Costa Rica | Co-Ed | 8-12 | 2000 |
| 262. EduKick Academic Soccer (Sports) Boarding School Academies | Co-Ed | 8-12, PG | 2001 |
| 263. Oliverian School | Co-Ed | 9-12, PG | 2003 |
| 264.-265. Donahue Academy of Ave Maria | Co-Ed | 11-12 | 2007 |
| 264.-265. Maharishi Academy of Total Knowledge | All-Boys | 9-12 | 2007 |
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