Summary:
Zip code 21093 in Timonium, Maryland, is home to a single large high school, Dulaney High, which serves grades 9-12 and is part of the Baltimore County Public Schools district.
Dulaney High is a large school with 1,889 students and a student-teacher ratio of 17.9:1. The school demonstrates a strong performance in English Language Arts (ELA), with 61.1% of students proficient, significantly outpacing both the district (46.1%) and state (51.7%) averages. However, it faces a major challenge in mathematics, where only 14.9% of all students are proficient—well below the state average. This "ELA vs. Math" paradox is the school's most defining characteristic. The school also boasts a high graduation rate of 90.1% and a low dropout rate of 7.7%, both better than district averages. Despite these strengths, its state ranking has declined from the 79th percentile (4 stars) in 2023-2024 to the 57th percentile (3 stars) in 2025-2026.
A key concern is chronic absenteeism, which affects 29% of students—higher than the district average of 25.6%—and likely contributes to the low math scores and ranking decline. The school spends $16,400 per student, a substantial amount that does not appear to be translating into strong math outcomes. With 33.25% of students eligible for free or reduced lunch, the school serves a significant economically disadvantaged population. While Dulaney High excels in reading and retains students well, its math proficiency rates in Algebra I (7.4%) and Geometry (15.1%) are critically low compared to state averages, indicating a systemic need for targeted math intervention and support.
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