State Accredited Nonpublic Schools
- St. Rose of Lima, Denison
- Northwest Iowa Protestant Reformed School, Doon
- St. Patrick's School, Sheldon
- Gehlen Catholic Elementary School, Le Mars
- Gehlen Catholic High School, Le Mars
- St. Mary's Grade School, Remsen
- St. Mary's Catholic High School, Remsen
- Hull Protestant Reformed Christian School
- Spalding Catholic Schools, Alton
- Bishop Heelan Catholic High School, Sioux City
- Danbury Catholic School
- Holy Cross Blessed Sacrament School, Sioux City
- Holy Cross St. Michael School, Sioux City
- Mater Dei School Immaculate Conception Center, Sioux City
- Mater Dei School Nativity Center, Sioux City
- Sacred Heart School, Sioux City
Independent Accredited Nonpublic Schools
- Zion Lutheran School, Denison
- Inwood Christian School
- Sanborn Christian School
- Sheldon Christian School
- Zion-St. John Lutheran School, Paullina
- Hull Christian School
- Ireton Christian School
- Netherlands Reformed Christian School, Rock Valley
- Orange City Christian School
- Rock Valley Christian School
- Sioux Center Christian School
- Unity Christian High School, Orange City
- Western Christian High School, Hull
- Siouxland Christian School, Sioux City
- St. Paul's Lutheran School, Sioux City
Specially Accredited College Preparatory Schools
Trinity Christian High School, Hull