Below Average
#1258 of 1,363 schools in MD
Great Mills High
High School · St. Mary's County Public Schools
21130 Great Mills Rd, Great Mills, MD 20634
Enrollment
1,748
Student-Teacher
19.4:1
Score
4.4
Grades
9th – 12th
Enrollment
1,748
Student-Teacher
19.4:1
Score
4.4
Grades
9th – 12th
Updated
2022-23
Updated 2022-23
How this school compares
In Great Mills
#3 of 3
public schools
Maryland high schools
#182 of 226
In district
#22 of 26
St. Mary's County Public Schools
About Great Mills High
Great Mills High serves 1,748 students in grades 9-12 in the St. Mary's County community of Great Mills, Maryland. With 90 full-time equivalent teachers, the school maintains a student-teacher ratio of 19.4:1, providing a manageable classroom environment for its sizable student body.
Academically, Great Mills High ranks 632nd out of 1,364 Maryland high schools, placing it in the 54th percentile statewide with room for continued growth. The school shows stronger performance in English Language Arts, where 55% of students score proficient or above, compared to mathematics at 35% proficiency. These results reflect opportunities for academic development, particularly in STEM subjects.
The school draws from a well-established community where the median household income reaches $131,042 and 38% of residents hold bachelor's degrees or higher. With a low poverty rate of 5.5% and median home values around $327,800, the surrounding area demonstrates economic stability that can support educational initiatives. Great Mills High operates in a small suburban setting along Great Mills Road, serving families in this close-knit St.
Mary's County community where residential neighborhoods blend with local businesses and services.
Score Breakdown
Full Profile · 4/4 metricsView breakdown
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Great Mills High — Students at Great Mills High score 32% proficient, which is below what's typical for similar communities (expected: 38%).
Equity & Diversity
Shown separately, not included in overall scoreFree/Reduced Lunch
55.9%
Students qualifying for federal meal assistance
Test Scores MD MCAP (2024-25)
Based on 8 test records from MD state assessments. About our data
Proficiency Trend
↓ DecliningAverage proficiency (% at or above grade level) across Math & ELA over time.
* COVID-affected year — test participation was uneven nationwide. This data is weighted at 50% in the Growth score calculation.
Source: EdFacts (NCES) and state assessment data. Growth score: 2.6/10.
How Great Mills High Compares
See how Great Mills High performs across key quality dimensions compared to state benchmarks.
Funding & Resources
Performance Trends
Math proficiency has declined from 47% (2019) to 7.2% (2025). Reading/ELA proficiency has improved from 51% (2019) to 55.9% (2025).
Location
21130 Great Mills Rd, Great Mills, MD 20634
Nearby Alternatives
Families considering Great Mills High may also want to explore other high schools in the area. Green Holly Elementary School (rated 9.1/10, 3.3 miles away, in nearby Lexington Park), which scores notably higher. Another option is Greenview Knolls Elementary (rated 8.8/10, 2.3 miles away), which scores notably higher. Additionally, George Washington Carver Elementary (rated 8.4/10, 0.4 miles away), which scores notably higher. For more schools in Great Mills, see our Great Mills schools guide .
Nearby Schools
20 within 7.7 miNeighborhood Census ACS (2019-2023)
Census data for ZIP 20634 (ACS 2019-2023 5-Year Estimates) · Data sources
Median Income
$117,431
Median Home Value
$334,800
Median Rent
$1,689/mo
Population
6,976
College Educated
40.6%
Homeownership
68.3%
Avg Commute
23.9 min
Poverty Rate
4.3%
Median Age
32.3
Community Profile
The community surrounding Great Mills High has a median household income of $117,431. It is a well-educated community where 41% of adults hold a bachelor's degree or higher. The median home value in the area is $334,800, with a median rent of $1,689/month. The local poverty rate of 4.3% is relatively low. The average commute for residents is 24 minutes. Source: U.S. Census ACS 2022 5-Year Estimates.
Similar Schools
Schools in the same state with comparable level, size, and ratings
| School | Rating |
|---|---|
| Fairmont Heights High Landover, MD | 4.4 |
| Lansdowne High Baltimore, MD | 4.4 |
| Patapsco High and Center for Arts Baltimore, MD | 4.4 |
| Westlake High School Waldorf, MD | 4.4 |
| Milford Mill Academy Baltimore, MD | 4.5 |
| Oakdale High Ijamsville, MD | 4.5 |
Frequently Asked Questions
Common questions about Great Mills High
What grades does Great Mills High serve?
Great Mills High serves students in grades 9th through 12th.
How many students attend Great Mills High?
Great Mills High has an enrollment of approximately 1,748 students.
What is the student-teacher ratio at Great Mills High?
The student-teacher ratio at Great Mills High is 19.4:1. A lower ratio generally means more individual attention per student. The national average is approximately 16:1 for public schools.
How does Great Mills High rank in MD?
Great Mills High is ranked #1258 out of 1,363 schools in MD.
What is Great Mills High's MySchoolScout rating?
Great Mills High has a composite rating of 4.4 out of 10 on MySchoolScout. This score combines academic performance, student growth, and school environment into a single score. Equity data is shown separately for context.
What are the test scores at Great Mills High?
Based on the most recent state assessment data, Great Mills High has 32.8% math proficiency and 54.2% reading/ELA proficiency.
Is Great Mills High a charter school?
No, Great Mills High is not a charter school. It is a traditional public school operated by the local school district.
Is Great Mills High a Title I school?
No, Great Mills High is not currently a Title I school.
What does the Free & Reduced Lunch percentage mean for Great Mills High?
55.9% of students at Great Mills High qualify for free or reduced-price lunch. This is a commonly used indicator of economic need and provides important context when interpreting test scores.
Neighborhood Context
Powered by 
FBI UCR 2024. County-level only. Data >1 year old.
Quick Facts NCES CCD (SY 2022-23)
- Grades
- 9th – 12th
- Enrollment
- 1,748
- Student-Teacher Ratio
- 19.4:1
- Teachers (FTE)
- 90
- Free/Reduced Lunch
- 55.9%
- Type
- regular
- Setting
- Small Suburb
- County
- St. Mary's County
- Phone
- (301) 863-4001
- Data Year
- 2023–2024
Resources & Links
District
St. Mary's County Public Schools- District Enrollment
- 17,223
- Schools in District
- 27
- Per-Pupil Spending
- $17,088
- District Rank
- #22 of 26
How We Rate Schools
Every school receives a composite score from 1 to 10 based on four pillars: Academic Performance (50%), Student Growth (20%), Equity (15%), and Learning Environment (15%). Scores are built from publicly available data including standardized test results, enrollment figures, and school climate indicators.
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