Here is a comprehensive list of Boarding Schools west of the Mississippi.
This list is courtesy of The Western Boarding School Association

Western Boarding Schools

 

 

 

Arizona (3)

• Verde Valley School
• Fenster School
• The Orme School of Arizona

 

 

 

British Columbia (5)

• St. George’s School
• Brentwood College School
• St. Michaels University School
• Saint Margaret’s School
• Shawnigan Lake School

California (19)

• Flintridge Sacred Heart Academy
• Woodside Priory School – The Priory
• Ojai Valley School
• The Webb Schools
• Army and Navy Academy
• Stevenson School
• Villanova Preparatory School
• Midland School
• Monte Vista Christian School
• Oak Grove School
• Southwestern Academy
• Dunn School
• San Domenico School
• Athenian School
• Santa Catalina School
• Cate School
• The Thacher School
• Besant Hill School (Formerly Happy Valley School)
• Idyllwild Arts Academy

Colorado (4)

• Lowell Whiteman School
• Colorado Rocky Mountain School
• Fountain Valley School
• Colorado Timberline Academy

Hawaii (1)

• Hawai’i Preparatory Academy

Manitoba (1)

• St. John’s-Ravenscourt School

Oregon (2)

• Canyonville Christian Academy
• Oregon Episcopal School

Texas (2)

• St. Stephen’s Episcopal School
• Hockaday School

Utah (1)

• Wasatch Academy

Washington (1)

• Annie Wright School