Built in the early 1960s, the school graduated its first senior class in 1965. As of 2015, Dulaney had reported a total enrollment of 1,851 students. The school is accredited by the state of Maryland and is a member of the National Association for College Admission Counseling. There were 186 faculty members in the 2015-2016 school year. Various proposals to renovate or replace the school building were made in 2016 and 2017. County officials budgeted $40 million in 2017 to renovate and air condition the facility, but the plan was rejected when parents contended that an entirely new school should instead be considered. In response, the then-County Executive proposed that the fiscal year 2019 budget include planning for a new high school to ease overcrowding at Dulaney and other area high schools. Funding was not forthcoming, however, and the Baltimore County Board of Education renewed its capital budget request for Fiscal Included in the overall $216 million sought would be replacement buildings for Dulaney and Towson High School.
In Baltimore County, Dulaney offers the highest number of Advanced Placement courses. In Spring 2005, 438 Dulaney students took 975 Advanced placement exams. Of this number, 85% scored the exams. In the 2004-2005 school year, 67% of seniors and 42% of juniors were enrolled in at least one AP course. Also in 2004-2005, 172 students received AP Scholar designation: 61 AP Scholars; 27 AP Scholars with Honors; 68 AP Scholars with Distinction; and 16 National AP Scholars.
Activities
Dulaney hosts more than 70 different clubs and organizations for its students. Among the clubs are: Peer Tutors, Science News Club, Girl Up, K-Pop Dance Club, Dance Team, Dulanians, Key Club, Sports Teams, and the National Honor Society. The Peer Tutors help students who have trouble in a wide array of subjects, usually for service hours or National Honor Society points. The Dulanians help adjust incoming 9th graders to the school, and show them the way at orientations, and other events. The Key Club is a service-oriented club that meets weekly, and hosts many service opportunities during the year. Dulaney also offers a theatrical program, which performs yearly plays as well as musicals. Dulaney also has a Vex Robotics team; it used to have a FIRST Robotics team, until the mentor stepped down in 2011. One of the largest and most prestigious organizations at Dulaney is the Lion's Roar Marching Band. The band marched in the 2011 and 2015 London New Year's Day Parades and has also marched several parades down Main Street, USA in the Magic Kingdom Park and Epcot at Walt Disney World in Orlando, Florida and performed in the 2013 Allstate Sugar Bowl Halftime Show.
Athletics
The Dulaney High School Lions have won the following Maryland State Championships:
Dulaney was awarded the Blue Ribbon School of Excellence in 1995. In 2010, Dulaney was named #259 on Newsweek magazine's "1,200 Top U.S. high schools" annual national survey.
