The federal government reports that Arizona's graduation rate for the 2009-2010 school year was 74.7 percent. The national average was 78.2 percent.
The rates indicate the percentage of 9th graders who go on to graduate within four years.
The rates are being reported by the National Center for Education Statistics, which is part of the U.S. Department of Education.
In Arizona the highest percentage of dropouts, 14 percent, were American Indian students, according to national data. Students classified as white, made up for 6.8 percent of the dropouts in the state.
Eight percent of students classified as Hispanic dropped out in the same year, and 8.8 percent of all high school dropouts were classified as black.
In Arizona 13,429 males dropped out compared to 11,061 females.
States' rates ranged from 57.8 percent in Nevada at the low end to 91.4 percent in Vermont at the high end. Arizona's rate was ninth worst in the country.