Los Angeles Unified's graduation rate improved to 77 percent in the last school year, the school district's numbers show.
The preliminary rate trails the latest statewide measure of around 80 percent, but increased by 12 percentage points from 65 percent. This marks a "historic high for L.A. Unified," Superintendent John Deasy said in a statement Friday.
"The preliminary rate does not factor in students who completed their requirements in summer school, and have also graduated. I expect the rate to grow," Deasy said.
The graduation rate is based on 9th-graders who are tracked over four years. The number takes into account regular high schools, not option programs such as those for independent study and dropouts.
Nearly 25,000 students graduated in the 2013-2014 school year.
L.A. Unified's improved graduate numbers reflect a national trend. The country reached its historic high when 80 percent of students received diplomas in 2012, Education Secretary Arne Duncan announced in April.
Correction: A previous version of this story incorrectly described option programs.