State laws follow varied sets of key organizing principles based on the Citizens League's recommendations for Minnesota, American Federation of Teachers guidelines, and/or federal charter-school legislation (U.S. Department of Education). Principles govern sponsorship, number of schools, regulatory waivers, degree of fiscal/legal autonomy, and performance expectations.
Current laws have been characterized as either "strong" or "weak." "Strong-law" states mandate considerable autonomy from local labor-management agreements and bureaucracy, allow a significant number of charter schools to be authorized by multiple charter-granting agencies, and allocate a level of funding consistent with the statewide per pupil average. According to the Center for Education Reform, a pro-charter group, in 2008 Minnesota, the District of Columbia, Michigan, Arizona, and California had the "strongest" laws in the nation. Mississippi and Iowa are home to the nation’s "weakest" laws, according to the same ranking.
70 percent of charter schools are found in states with the "strongest" laws: Arizona, California, Colorado, Massachusetts, Michigan, Minnesota, and North Carolina.
In the aftermath of Hurricane Katrina, over half of the New Orleans schools that are re-opening are doing so as charter schools.