| All Hallows High School
| New York | NY | 9th-12th | none | Boys only | 635 | Roman Catholic |
| Archbishop Curley High School
| Baltimore | MD | 9th-12th | none | Boys only | 560 | Roman Catholic |
| Archbishop Shaw High School
| Marrero | LA | 8th-12th | none | Boys only | 550 | Roman Catholic |
| Archbishop Stepinac High School
| White Plains | NY | 9th-12th | none | Boys only | 685 | Roman Catholic |
| Army and Navy Academy
| Carlsbad | CA | 7th-12th | 7th-12th | Boys only | 339 | None |
| Avon Old Farms School
| Avon | CT | 9th-12th | 9th-12th | Boys only | 405 | None |
| Belmont Hill School
5/5
based on 1 student review(s) | Belmont | MA | 7th-12th | 9th-12th | Boys only | 420 | None |
| Benedictine High School
| Cleveland | OH | 9th-12th | none | Boys only | 425 | Roman Catholic |
| Bishop Hendricken High School
| Warwick | RI | 9th-12th | none | Boys only | 950 | Roman Catholic |
| Boston College High School
| Boston | MA | 7th-12th | none | Boys only | 1543 | Roman Catholic (Jesuit) |
| Boys' Latin School of Maryland
| Baltimore | MD | K-12th | none | Boys only | 600 | None |
| Brophy College Preparatory
| Pheonix | AZ | 9th-12th | none | Boys only | 1260 | Roman Catholic |
| Brother Rice High School
| Bloomfield Hills | MI | 9th-12th | none | Boys only | 710 | Roman Catholic |
| Browning School
| New York | NY | K-12th | none | Boys only | 388 | None |
| Brunswick School
| Greenwich | CT | PK-12th | none | Boys only | 940 | None |
| Canisius High School
| Buffalo | NY | 9th-12th | none | Boys only | 823 | Roman Catholic (Jesuit) |
| Cathedral Preparatory School
| Erie | PA | 9th-12th | none | Boys only | 557 | Roman Catholic |
| Cathedral Preparatory Seminary
| Elmhurst | NY | 9th-12th | none | Boys only | 178 | Roman Catholic |
| Catholic High School
| Baton Rouge | LA | 8th-12th | none | Boys only | 993 | Roman Catholic |
| Catholic Memorial School
| West Roxbury | MA | 7th-12th | none | Boys only | 805 | Roman Catholic |
| Central Catholic High School
| Pittsburgh | PA | 9th-12th | none | Boys only | 861 | Roman Catholic |
| Chaminade High School
4.4/5
based on 1 student review(s) | Mineola | NY | 9th-12th | none | Boys only | 1650 | Roman Catholic |
| Christ School
| Arden | NC | 8th-12th | 8th-12th | Boys only | 248 | Episcopal |
| Christian Brothers Academy
| Lincroft | NJ | 9th-12th | none | Boys only | 937 | Roman Catholic |
| Cistercian Preparatory School
| Irving | TX | 5th-12th | none | Boys only | 343 | Roman Catholic |
| Collegiate School
| New York | NY | K-12th | none | Boys only | 630 | None |
| Covington Catholic High School
| Park Hills | KY | 9th-12th | none | Boys only | 502 | Roman Catholic |
| De La Salle Collegiate High School
| Warren | MI | 9th-12th | none | Boys only | 873 | Roman Catholic |
| De Smet Jesuit High School
| St. Louis | MO | 9th-12th | none | Boys only | 1114 | Roman Catholic (Jesuit) |
| DeMatha Catholic High School
| Hyattsville | MD | 9th-12th | none | Boys only | 1012 | Roman Catholic |
| Devon Preparatory School
| Devon | PA | 6th-12th | none | Boys only | 295 | Roman Catholic |
| Dexter School
| Brookline | MA | PK-12th | none | Boys only | 434 | None |
| Fairfield College Preparatory School
| Fairfield | CT | 9th-12th | none | Boys only | 925 | Roman Catholic (Jesuit) |
| Father Judge High School
| Philadelphia | PA | 9th-12th | none | Boys only | 1293 | Roman Catholic |
| Fishburne Military School
| Waynesboro | VA | 8th-12th | 8th-12th | Boys only | 200 | None |
| Fordham Preparatory School
| Bronx | NY | 9th-12th | none | Boys only | 919 | Roman Catholic (Jesuit) |
| Fork Union Military Academy
| Fork Union | VA | 6th-PG | 6th-PG | Boys only | 475 | Baptist |
| Georgetown Preparatory School
4.8/5
based on 1 student review(s) | North Bethesda | MD | 9th-12th | 9th-12th | Boys only | 480 | Roman Catholic (Jesuit) |
| Gilman School
| Baltimore | MD | 1st-12th | none | Boys only | 1012 | None |
| Gonzaga College High School
4.8/5
based on 1 student review(s) | Washington | DC | 9th-12th | none | Boys only | 930 | Roman Catholic (Jesuit) |
| Hargrave Military Academy
| Chatham | VA | 7th-PG | 7th-PG | Boys only | 400 | None |
| Haverford School
3.8/5
based on 3 student review(s) | Haverford | PA | PK-12th | none | Boys only | 960 | None |
| Heights School
| Potomac | MD | 3rd-12th | none | Boys only | 458 | Roman Catholic |
| Holy Cross School
| New Orleans | LA | 5th-12th | none | Boys only | 940 | Roman Catholic |
| Holy Ghost Preparatory School
| Bensalem | PA | 9th-12th | none | Boys only | 503 | Roman Catholic |
| Iona Preparatory School
| New Rochelle | NY | 9th-12th | none | Boys only | 770 | Roman Catholic |
| Jesuit College Preparatory School
| Dallas | TX | 9th-12th | none | Boys only | 1030 | Roman Catholic (Jesuit) |
| Jesuit High School
| Carmichael | CA | 9th-12th | none | Boys only | 1080 | Roman Catholic (Jesuit) |
| Jesuit High School
| Tampa | FL | 9th-12th | none | Boys only | 645 | Roman Catholic (Jesuit) |
| Jesuit High School
| New Orleans | LA | 8th-12th | none | Boys only | 1388 | Roman Catholic (Jesuit) |
| Kiski School
| Saltburg | PA | 9th-PG | 9th-PG | Boys only | 215 | None |
| La Salle College High School
| Wyndmoor | PA | 9th-12th | none | Boys only | 1060 | Roman Catholic |
| La Salle Institute
| Troy | NY | 6th-12th | none | Boys only | 600 | Roman Catholic |
| Landon School
4.4/5
based on 3 student review(s) | Bethesda | MD | 3rd-12th | none | Boys only | 679 | None |
| Loyola Blakefield
| Towson | MD | 6th-12th | none | Boys only | 1000 | Roman Catholic (Jesuit) |
| Loyola High School
| Los Angeles | CA | 9th-12th | none | Boys only | 1250 | Roman Catholic (Jesuit) |
| Malden Catholic High School
| Malden | MA | 9th-12th | none | Boys only | 764 | Roman Catholic |
| Malvern Preparatory School
| Malvern | PA | 6th-12th | none | Boys only | 597 | Roman Catholic |
| Marquette University High School
| Milwaukee | WI | 9th-12th | none | Boys only | 1050 | Roman Catholic (Jesuit) |
| McCallie School
| Chattanooga | TN | 6th-12th | 9th-12th | Boys only | 890 | None |
| McQuaid Jesuit High School
| Rochester | NY | 7th-12th | none | Boys only | 875 | Roman Catholic (Jesuit) |
| Memphis University School
| Memphis | TN | 7th-12th | none | Boys only | 643 | None |
| Monsignor Bonner High School
| Drexel Hill | PA | 9th-12th | none | Boys only | 1282 | Roman Catholic |
| Montgomery Bell Academy
| Nashville | TN | 7th-12th | none | Boys only | 670 | None |
| Mount Michael Benedictine School
| Elkhorn | NE | 9th-12th | 9th-12th | Boys only | 169 | Roman Catholic |
| Notre Dame College Prep
| Niles | IL | 9th-12th | none | Boys only | 830 | Roman Catholic |
| Notre Dame High School
| West Haven | CT | 9th-12th | none | Boys only | 700 | Roman Catholic |
| Regis High School
4.5/5
based on 4 student review(s) | New York | NY | 9th-12th | none | Boys only | 535 | Roman Catholic (Jesuit) |
| Riverside Military Academy
| Gainsville | GA | 7th-12th | 7th-12th | Boys only | 400 | None |
| Rockhurst High School
| Kansas City | MO | 9th-12th | none | Boys only | 1055 | Roman Catholic |
| Roman Catholic High School
| Philadelphia | PA | 9th-12th | none | Boys only | 966 | Roman Catholic |
| Roxbury Latin School
4.5/5
based on 2 student review(s) | West Roxbury | MA | 7th-12th | none | Boys only | 297 | None |
| Saint Agnes Boys High School
| New York | NY | 9th-12th | none | Boys only | 300 | Roman Catholic |
| Saint Louis Priory School
| St. Louis | MO | 7th-12th | none | Boys only | 390 | Roman Catholic |
| Salesianum School
| Wilmington | DE | 9th-12th | none | Boys only | 1042 | Roman Catholic |
| Salisbury School
| Salisbury | CT | 9th-PG | 9th-PG | Boys only | 295 | Episcopal |
| School at Church Farm
| Exton | PA | 7th-12th | 7th-12th | Boys only | 200 | Episcopal |
| Servite High School
| Anaheim | CA | 9th-12th | none | Boys only | 877 | Roman Catholic |
| St. Albans School
4.6/5
based on 1 student review(s) | Washington | DC | 4th-12th | 9th-12th | Boys only | 575 | Episcopal |
| St. Augustine High School
| San Diego | CA | 9th-12th | none | Boys only | 699 | Roman Catholic |
| St. Christopher's School
| Richmond | VA | PK-12th | none | Boys only | 961 | Episcopal |
| St. Francis De Sales High School
| Toledo | OH | 9th-12th | none | Boys only | 596 | Roman Catholic |
| St. John Vianney High School
| St. Louis | MO | 9th-12th | none | Boys only | 585 | Roman Catholic |
| St. John's High School
| Shrewsbury | MA | 9th-12th | none | Boys only | 1058 | Roman Catholic |
| St. John's Northwest Military Academy
| Delafield | WI | 7th-12th | 7th-12th | Boys only | 341 | None |
| St. John's Preparatory School
5/5
based on 1 student review(s) | Danvers | MA | 9th-12th | none | Boys only | 1200 | Roman Catholic |
| St. Joseph High School
| Metuchen | NJ | 9th-12th | none | Boys only | 823 | Roman Catholic |
| St. Joseph's Collegiate Institute
| Buffalo | NY | 9th-12th | none | Boys only | 780 | Roman Catholic |
| St. Joseph's Preparatory School
4.6/5
based on 2 student review(s) | Philadelphia | PA | 9th-12th | none | Boys only | 980 | Roman Catholic |
| St. Mark's School of Texas
4.7/5
based on 2 student review(s) | Dallas | TX | 1st-12th | none | Boys only | 820 | None |
| St. Mary's Preparatory School
| Orchard Lake | MI | 9th-12th | 9th-12th | Boys only | 540 | Roman Catholic |
| St. Patrick High School
| Chicago | IL | 9th-12th | none | Boys only | 961 | Roman Catholic |
| St. Paul's School
| Brooklandville | MD | K-12th | none | Boys only | 853 | Episcopal |
| Saint Peter's Preparatory School
| Jersey City | NJ | 9th-12th | none | Boys only | 915 | Roman Catholic (Jesuit) |
| St. Sebastian's School
| Needham | MA | 7th-12th | none | Boys only | 350 | Roman Catholic |
| St. Thomas High School
| Houston | TX | 9th-12th | none | Boys only | 682 | Roman Catholic |
| St. Xavier High School
| Louisville | KY | 9th-12th | none | Boys only | 1431 | Roman Catholic |
| Strake Jesuit College Preparatory
| Houston | TX | 9th-12th | none | Boys only | 868 | Roman Catholic (Jesuit) |
| Trinity-Pawling School
| Pawling | NY | 7th-PG | 9th-PG | Boys only | 320 | Episcopal |
| University School
| Hunting Valley | OH | K-12th | none | Boys only | 870 | None |
| Valley Forge Military Academy and College
4.2/5
based on 1 student review(s) | Wayne | PA | 7th-12th | 7th-PG | Boys only | 524 | None |
| Xaverian Brothers High School
4.4/5
based on 6 student review(s) | Westwood | MA | 7th-12th | none | Boys only | 900 | Roman Catholic |
| Xavier High School
| Middletown | CT | 9th-12th | none | Boys only | 873 | Roman Catholic |
| Xavier High School
| New York | NY | 9th-12th | none | Boys only | 938 | Roman Catholic |