- Association of Boarding Schools (TABS)
 - Boarding school information and resources; includes directory containing information on over 250 TABS boarding schools. - Association of Delaware Valley Independent Schools
- Association of private schools in Pennsylvania, Delaware, and New Jersey.
- Association of Independent Schools in New England (AISNE)
- Organisation of private day and boarding schools in Massachusetts, Rhode Island, Maine, Vermont, and New Hampshire, with information on enrolment, application, positions, and publications.
- Association of Waldorf Schools of North America
- Provides information about Waldorf education and schools.
- California Association of Independent Schools
- California League of High Schools
- Dedicated to furthering the growth and development of secondary schools.
- Catholic Boarding Schools Association
- Information about and a list of K-12 boarding schools around the U.S.
- Coalition of Essential Schools
- National network of schools using common principles to inform school change, school design, and school reform efforts.
- Federation of Independent Schools in Canada (FISC)
- Supports, encourages, and represents the interests and concerns of member associations.
- Independent Schools Association of the Central States (ISACS)
- Massachusetts Association of Student Councils (MASC)
- Midwest Boarding Schools
- Association of independent, college preparatory day and boarding schools.
- Mississippi Private School Association
- Service agency for member schools in Mississippi, Louisiana, Arkansas, and Tennessee.
- National Association of Independent Schools
- A voluntary membership association for schools and associations.
- National Independent Private School Association
- Organisation for educators who are also entrepreneurs.
- Network of Sacred Heart Schools
- Collaborative online community for Sacred Heart faculty and students across the country.
- New York State Association of Independent Schools
- North Carolina Association of Independent Schools
- North Carolina Christian School Association
- Ohio Coalition of Essential Schools
- Working to improve student performance through teacher training and fundamental redesign of schools.
- Ontario Federation of Independent Schools (OFIS)
- Acts as a advocate for non-sectarian and religiously based schools and home schoolers in Ontario.
- South Carolina Independent School Association
- Western Boarding Schools Association (WBSA)
- Directory of boarding schools serving the U.S. and Canada.
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