National and Regional private school association website links:

National Association of Independent Schools (NAIS)
NAIS is a nonprofit membership association that provides services to over 1,600 independent private K-12 schools in the U.S. and abroad.

Council for American Private Education (CAPE)
CAPE is a coalition of national organizations and state affiliates serving private elementary and secondary schools, aiming to preserve and promote educational pluralism.

Office of Non-Public Education
The Office of Non-Public Education, part of the U.S. Department of Education, offers information and resources for private elementary and secondary schools.

National Independent Private Schools Association (NIPSA)
NIPSA is a one-stop source for consulting services, conferences, workshops, and news for independent private schools[2].

Independent School Alliance
The Independent School Alliance empowers children of exceptional talent and potential from racially underrepresented and economically under-resourced communities to transform independent schools and society.