Some states do not have their own private school associations. Schools band together across state lines forming regional associations. These associations have the same purpose as state and national associations which is promote private schools and to share latest and best practices. Also included are several associations in major metropolitan areas.
- Association of Independent Schools of Greater Washington
- Association of Independent Schools of New England
- Cleveland Council of Independent Schools
- Fairchester Independent Schools
- Independent Schools Association of the Central States
- Independent Schools Association of Northern New England
- Independent Schools Association of the Southwest
- Long Island Association of Private Schools and Day Camps
- Los Angeles Area Schools
- New York Interschool
- Pacific Northwestern Association of Independent Schools
- Southern Association of Independent Schools
- Southwestern Association of Episcopal Schools
- Western Boarding School Association
