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Accredited institutions and programs are listed by state and are in alphabetical order. The abbreviations I & T, EC, EI-II, SI, and SI-II stand for the age level(s) each institution/programs has been accredited to offer:
I&T Infant and Toddler (birth through age 3)
EC Early Childhood (ages 2 ½ through 6)
EI or EI-II Elementary I (ages 6 through 9) or I-II (ages 6 through 12)
SI or SI-II Secondary I (ages 12 through 15) or I-II (ages 12 through 18)
 
Three levels of accreditation are listed:
  Initial Accreditation (IA) is granted for a maximum period of four years (through the year indicated), and may be extended to a maximum of seven years upon submission of a satisfactory Interim Report at the end of the third year of operation
  Full Accreditation Initial or renewed, for a maximum period of seven years (through the year indicated).
  Accreditation with Stipulations/Probation Deficiencies have been identified by the Commission, and must be corrected by the year indicated in order for the institution's/program's Full Accreditation status to be restored.
 
Title IV Certification

Free-standing accredited institutions/programs that have been certified through the U.S. Department of Education to offer Title IV funding (federal grants and loans) to their students are starred and in bold print in the directory listings. Many of the programs located within colleges and universities also offer Title IV funding to students (these are underlined)
 
Organizational Affiliation

Many accredited institutions/programs are affiliated with Montessori societies, organizations, consortia, or groups of independents. Affiliations are indicated next to the name of the program (with acronyms in parentheses), and may include:

  Association Montessori Internationale (AMI)
  The American Montessori Society (AMS) Applicants for AMS affiliation are designated by (AMS App.)
  The International Association of Progressive Montessori and the Montessori Institute of America (IAPM/MIA)
  Montessori Educational Programs International and the Pan American Montessori Society (MEPI/ PAMS)
  Independents Not In An Organization or Consortium (IND)
  International Consortium #1 (IC #1)