The following schools have been NAIS members since its founding in 1962. Several of the schools were members of the organizations that came together to form NAIS, the Independent Schools Education Board (ISEB) and the National Council of Independent Schools (NCIS).
| Member Schools Since NAIS’s Founding in 1962 |
| Abington Friends School |
| Albuquerque Academy |
| Applewild School |
| Army and Navy Academy |
| Beaver Country Day School |
| Berwick Academy |
| Birch Wathen Lenox School |
| Breck School |
| Calvert School |
| Cathedral School for Boys |
| Cathedral School of St. John Divine |
| Christ Church Episcopal School |
| Collegiate School |
| Columbia Grammar and Preparatory School |
| Country School |
| Cranbrook Schools |
| Culver Academies |
| Cushing Academy |
| Dalton School |
| Dana Hall School |
| Darrow School |
| Deerfield Academy |
| Delbarton School |
| Detroit Country Day School |
| Dublin School |
| Dunn School |
| Durham Academy |
| Dwight-Englewood School |
| East Woods School |
| Ellis School |
| Emma Willard School |
| Episcopal Academy |
| Episcopal High School |
| Evansville Day School |
| Fairfield Country Day School |
| Fenn School |
| Fenster School |
| Fessenden School |
| Fort Worth Country Day |
| Foxcroft School |
| Francis Parker School |
| Friends Academy |
| Friends' Central School |
| Fryeburg Academy |
| Gill St. Bernard's School |
| Girls Preparatory School |
| Governor's Academy |
| Graland Country Day School |
| Green Vale School |
| Greenwich Country Day School |
| Groton School |
| Grymes Memorial School |
| Gunnery |
| Hackley School |
| Hamden Hall Country Day School |
| Hampton Roads Academy |
| Hanahau'oli School |
| Harley School |
| Haverford School |
| Hawken School |
| Head-Royce School |
| Hewitt School |
| High Mowing School |
| Highland School |
| Hill School |
| Holderness School |
| Holland Hall School |
| Holy Child Academy |
| Horace Mann School |
| Hotchkiss School |
| Hutchison School |
| Indian Springs School |
| Interlochen Center for the Arts |
| Iolani School |
| Isidore Newman School |
| John Burroughs School |
| John Thomas Dye School |