The four-year graduation rate for Fairfax County seniors reached 92 percent last year, beating the statewide average by almost three points, according to recently released data from the Virginia Department of Education.

A closer look at the report shows that more Fairfax County girls than boys graduate on time, and more black students in Fairfax graduate in four years than their peers across the state. The graduation rate for girls in Fairfax County last year was 93.6 percent, three percentage points higher than the boys. The black student graduate rate was 88.3 percent last year, more than four points above the state average of 84.1 percent.

For poor students, a growing population in Fairfax County schools, the graduation rate was 84.5, slightly higher than for other economically disadvantaged teenagers across the state.

But the county lags in graduating Hispanic students on time. About 81 percent of Hispanic students in the county graduate within four years, compared to 83.3 percent statewide. In addition, the drop-out rate for Hispanic seniors in Fairfax last year reached 14.9 percent, three points higher than the state average.

At Mount Vernon High School, where the overall graduation rate is 88.3 percent, the girls’ graduation rate was 94.4 percent, 12 percentage points higher than the boys’ rate.

Herndon High School had the highest graduation rate for black students, with 97.5 percent of the cohort completing school within four years.

McLean High School had the lowest graduation rate for black students, with 81.3 percent graduating on time.

Robinson Secondary School had the highest graduation rate for Hispanic students, 96.9 percent, and J.E.B. Stuart High School had the lowest, with 75.1 percent.

The class of 2013 graduation rate in Fairfax, by far the largest school district in the state with more than 13,500 seniors, improved by .7 percent compared to 2012. In Loudoun County, the graduation rate last year was 95.7 with 4,518 seniors. In Chesapeake County, with 3,283 students in the graduating class, the four-year completion rate was also 92 percent.

Overall, Madison High School had the highest graduation rate, 98.2 percent, and Falls Church High School had the lowest, with 85.6 percent. (At the elite magnet school, the Thomas Jefferson High School for Science and Technology, the graduation rate was perfect.)

Below is a break-down of the graduation rates at high schools across Fairfax:

Annandale High School: 89.8 percent.

Centreville High School: 94.8 percent.

Chantilly High School: 97.4 percent.

Edison High School: 92.8 percent.

Fairfax High School: 93.8 percent.

Falls Church High School: 85.6 percent.

Hayfield Secondary School: 92.7 percent.

Herndon High School: 93 percent.

Lake Braddock Secondary: 95.6 percent.

Langley High School: 97.6

Lee High School: 89.9

Madison High School: 98.2 percent.

Marshall High School: 93.5 percent.

McLean High School: 97.8

Mount Vernon High School: 88.3 percent.

Oakton High School: 97.2 percent.

Robinson Secondary: 97.8 percent.

South County High School: 97 percent.

South Lakes High School: 94.8percent.

Stuart High School: 84.3 percent.

Thomas Jefferson High School for Science and Technology: 100 percent.

West Potomac High School: 88.4 percent.

West Springfield High School: 95.7 percent.

Westfield High School: 95 percent.

Woodson High School: 97.2 percent.