According to SchoolDigger.com, for the school year 2014 - 2015, top-rated California school districts are Portola Valley Elementary, Orinda Union Elementary, Las Lomitas Elementary, Saratoga Union Elementary and Hillsborough City Elementary. The districts are ranked after averaging individual school districts' rank percentile.
Rank updates are done yearly after the California Department of Education releases test scores of the school districts. Portola Valley Elementary has two schools and approximately 650 students. Orinda Union Elementary serves students in kindergarten through eighth grade. The district has four elementary schools and one middle school with a total of 2482 students. Las Lomitas Elementary in Menlo Park has one elementary school and one middle school with over 1384 students.
Other highly ranked school districts are Woodside Elementary, Los Altos Elementary and Moraga Elementary.