A private school is a nonpublic school that conducts a program of kindergarten and at least one grade, or a program of any or all grades one through twelve. Private schools must be approved by the State Board of Education, maintain a program that ensures a sufficient basic education for students to meet usual state graduation requirements, and meet reasonable standards for health and safety of private school students. 

A private school is a non-public school that conducts a program of kindergarten and at least one grade, or a program of any or all grades one through twelve. Approximately five hundred private schools operate in Washington, serving over 80,000 students.