| School Name | City | State | Grades | Gender | Boarding | School Size |
| Allen-Stevenson School | New York City | NY | K-9 | All-Boys | 414 | |
| American Boychoir School | Princeton | NJ | 4-8 | All-Boys | Y | 32 |
| Army & Navy Academy | Carlsbad | CA | 7-12 | All-Boys | Y | 300 |
| Avon Old Farms School | Avon | CT | 9-PG | All-Boys | Y | 405 |
| Belmont Hill School | Belmont | MA | 7-12 | All-Boys | Y | 440 |
| Benedictine High School | Richmond | VA | 9-12 | 274 | ||
| Blue Ridge School | St. George | VA | 9-12 | All-Boys | 160 | |
| Boston College High School | Boston | MA | 7-12 | All-Boys | 1500 | |
| Brunswick School | Greenwich | CT | PK-12 | All-Boys | 940 | |
| C.F.S. - The School at Church Farm | Exton | PA | 7-12 | All-Boys | Y | 185 |
| Cardigan Mountain School | Canaan | NH | 6-9 | All-Boys | Y | 214 |
| Cathedral School for Boys | San Francisco | CA | K-8 | All-Boys | 267 | |
| Chaminade College Preparatory School | St. Louis | MO | 6-12 | All-Boys | Y | 830 |
| Chestnut Hill Academy | Philadelphia | PA | PK-12 | All-Boys | 607 | |
| Christ School | Arden | NC | 8-12 | All-Boys | Y | 290 |
| Delbarton School | Morristown | NJ | 7-12 | All-Boys | 542 | |
| Dexter School | Brookline | MA | PK-12 | All-Boys | 439 | |
| Eaglebrook School | Deerfield | MA | 6-9 | All-Boys | Y | 248 |
| Fairfield Country Day School | Fairfield | CT | K-9 | All-Boys | 260 | |
| Fenn School | Concord | MA | 4-9 | All-Boys | 305 | |
| Fessenden School | West Newton | MA | K-9 | All-Boys | Y | 526 |
| Georgetown Preparatory School | North Bethesda | MD | 9-12 | All-Boys | Y | 491 |
| Gilman School | Baltimore | MD | K-12 | All-Boys | 1022 | |
| Haverford School | Haverford | PA | PK-12 | All-Boys | 970 | |
| Hillside School | Marlborough | MA | 5-9 | All-Boys | Y | 145 |
| Malvern Preparatory School | Malvern | PA | 6-12 | All-Boys | 624 | |
| Marmion Academy | Aurora | IL | 9-12 | All-Boys | 520 | |
| McCallie School | Chattanooga | TN | 6-12 | All-Boys | Y | 932 |
| Montgomery Bell Academy | Nashville | TN | 7-12 | All-Boys | 713 | |
| Newark Boys Chorus School | Newark | NJ | 4-8 | All-Boys | 85 | |
| Oxford Academy | Westbrook | CT | 9-PG | All-Boys | Y | 48 |
| Princeton Academy of the Sacred Heart | Princeton | NJ | JK-8 | All-Boys | 227 | |
| Rocky Hill School | East Greenwich | RI | K-12 | All-Boys | 325 | |
| Roxbury Latin School Top 25 | West Roxbury | MA | 7-12 | All-Boys | 294 | |
| Saint David's School | New York | NY | PK-8 | All-Boys | 400 | |
| Saint Louis Priory School | Saint Louis | MO | 7-12 | All-Boys | 424 | |
| Saint Louis School | Honolulu | HI | 6-12 | All-Boys | 604 | |
| Saint Thomas More School | Oakdale | CT | 7-PG | All-Boys | Y | 140 |
| Salisbury School | Salisbury | CT | 9 to 12 | All-Boys | Y | 310 |
| San Antonio Academy of Texas | San Antonio | TX | PK-8 | 344 | ||
| South Kent School | South Kent | CT | 9-PG | All-Boys | Y | 180 |
| St. Albans School | Washington | DC | 4-12 | 570 | ||
| St. Bernard's School | New York | NY | K-9 | All-Boys | 383 | |
| St. Christopher's School | Richmond | VA | PK-12 | 954 | ||
| St. John's Preparatory School | Danvers | MA | 9-12 | All-Boys | Y | 1500 |
| St. Mark's School of Texas | Dallas | TX | 1-12 | 847 | ||
| St. Sebastian's School | Needham | MA | 7-12 | All-Boys | 363 | |
| St. Thomas Choir School | New York | NY | 3-8 | All-Boys | Y | 41 |
| Stuart Hall for Boys | San Francisco | CA | K-8 | All-Boys | 345 | |
| Stuart Hall High School | San Francisco | CA | 9-12 | All-Boys | 162 | |
| The Browning School | New York | NY | K-12 | All-Boys | 387 | |
| The Buckley School | New York | NY | K-9 | All-Boys | 380 | |
| The Deck House School | Edgecomb | ME | 9-12 | All-Boys | Y | 12 |
| The Heights School | Potomac | MD | 3-12 | All-Boys | 462 | |
| The Kiski School | Saltsburg | PA | 9-PG | All-Boys | Y | 206 |
| The Landon School | Bethesda | MD | 3-12 | All-Boys | 689 | |
| Town School for Boys | San Francisco | CA | K-8 | All-Boys | 400 | |
| Trinity-Pawling School | Pawling | NY | 8-PG | All-Boys | Y | 300 |
| Valley Forge Military Academy & College | Wayne | PA | 7-12 | All-Boys | Y | 300 |