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Great Mills High
Test scores
MCAP 2024-25 . % Proficient (Levels 3-4)What this means: On the MCAP, Maryland's statewide test, about 56 of every 100 students at this school read and write at grade level and about 12 of 100 do math at grade level. Across all Maryland schools, those numbers are about 51 and 35. Reading and writing scores are up about 6 points since 2023, while math scores are up about 2 points.
BeatsExpectations
Demographically-adjusted score · methodologyWhat this means: About 32% of students here test proficient in math and reading, compared with the roughly 40% typical for Maryland schools with a similar share of low-income students. BeatsExpectations measures results against demographically similar schools rather than by raw scores, and this school falls within the typical range, neither among Maryland's top nor bottom 10%.
7-year change
SY 2017-18 vs SY 2024-25About Great Mills High
As a mid-tier senior high in Great Mills, Maryland, Great Mills High teaches 1,697 students from grades 9 through 12, part of St. Mary's County Public Schools. Enrollment runs roughly 43% bigger than the state mean of about 1,185.
Across the 26 schools in St. Mary's County Public Schools (16,905 students total), Great Mills High accounts for its share of the district's footprint.
Demographically, Great Mills High reports that the most-represented group is Black (38%), with the rest of the student body spread across multiple groups. The remainder is composed of 34% White, 14% Hispanic, 10% multiracial, 3% Asian. By comparison, St. Mary's County as a whole is about 15% Black, so the school skews meaningfully more Black than its surroundings.
On the income-and-resources front, Great Mills High logs 89 full-time-equivalent teachers, putting the student-to-teacher ratio at about 19.1:1. The state averages around 15.3:1, so this campus is higher than the state norm typical. An estimated 57% of students are eligible for free or reduced-price lunch, a number frequently used as a low-income enrollment indicator. By comparison, St. Mary's County runs at roughly 41%, so the school's eligibility rate is meaningfully above the surrounding baseline.
After controlling for student poverty, Great Mills High tracks the demographic baseline. The model predicts 40.2% given the school's FRL share; actual proficiency is 32.1%.
Around the school, community-level numbers for St. Mary's County indicate median household earnings sit near $119,446, about 37% of the adult population holds a bachelor's degree or above, and roughly 6% of residents live below the federal poverty line. Across St. Mary's County's 28 public schools (combined enrollment of about 16,905 students), Great Mills High is one campus in the mix.
The closest other public school is George Washington Carver Elementary, roughly 0.4 miles away. Within five miles, there are 8 other public schools. Ranking that nearby cluster on reported proficiency puts Great Mills High at 8th of 9; the average score across the group is 43.9%.
Great Mills High operates from a residential location.
Looking at the recent track record. Great Mills High's enrollment has edged up 3% since 2018, when it stood at 1,655 (now 1,697). White enrollment moved from 41% to 34% across the same window.
On allk12, the feed for Great Mills High typically covers school events, parent volunteer needs, and clubs. Members of the school community can share what they know.
St. Mary's County at a glance
View full county profileQuick facts
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