Chapters

• Alaska
• Arizona-New Mexico
• Utah (Formerly the Bonneville Chapter)
• California-Nevada
• Colorado-Wyoming
• Idaho
• Mexico
• Montana
• Washington-British Columbia Chapter (Formerly North Pacific Internactional Chapter)
• Oregon

Student Chapters

• University of Alaska Student Unit
• New Mexico State University Student Chapter
• Palouse Unit - University of Idaho Student Chapter
• Colorado State University Student Chapter
• University of Wyoming Student Chapter
• Oregon State University Students Chapter
• Montana State University Student Subunit
• USU Student subunit of the Bonneville Chapter