Of nearly 2,300 Glendale Unified students who began high school in 2009, 90.4% went on to earn their diplomas as part of the class of 2013, according to data that state officials released this week.
Meanwhile, nearly 140 students dropped out, giving the school district a 6.1% dropout rate.
Overall, Glendale Unified's graduation rate comes in well above the 80% state average.
"For the first time in our state's history, more than 80% of our students are graduating — a clear sign of their hard work and the support they receive from their teachers, families and communities," said state Supt. Tom Torlakson.
The rates were calculated by tracking students who entered high school in 2009 on their path to graduation in 2013.
The recent figure also comes above Glendale Unified's previous counts.
In 2011-12, Glendale Unified reported an 88.1% graduation rate, slightly up from 87.5% in 2010-11.
Deb Rinder, senior director of educational services for Glendale Unified, said the school district aims to address students' individual needs, and educators are well aware that beyond academics, extracurricular activities such as sports, drama, art and music keep students invested in school.