The Hawaii Board of Education was formed on October 15, 1840. Founded by King Kamehameha III, it is the oldest public school system west of the Mississippi. Hawaii state law requires children to attend school from ages 6–18. Hawaii has one statewide school district. The total public school enrollment is approximately 180,000 students. The average number of pupils per teacher is 20:1 in K-2, and 26:1 for grades 3-12. There are 13,000 classroom teachers in Hawaii's public schools.