The first charter school opened in St. Paul, Minnesota•the first state to have a charter school law - in 1992. The 4,132 charter schools in the United States in 2006 were educating 1,157,359 students, over 2% of all public school students. The five states with the greatest number of charter schools in 2006 were, in order from greatest to least: California, Arizona, Texas, Florida, and Ohio. Twenty-nine states that have charter schools have fewer than 100 of them. The lowest number of charter schools in a state that did have them was 1 in Mississippi. In 2008, there were more than 4,500 charter schools serving over million students.