Average
#875 of 1,363 schools in MD
Great Mills High
High School · St. Mary's County Public Schools · Great Mills, MD
A St. Mary's County Public Schools high school serving grades 9th – 12th.
21130 Great Mills Rd, Great Mills, MD 20634
- Math 15% vs MD 30% (2025)
- Reading 56% vs MD 51% (2025)
- 86.0% 4-year graduation
Academics
Full Profile · 4/4 metricsView breakdown
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Students at Great Mills High score 35% proficient, which is below what's typical for similar communities (expected: 36%).
2025 MCAP proficiency
Most recent published year. School vs. MD average.
Trend
↓ DecliningProficiency has fallen 13 points since 2020, to 35% in 2025, across a 17-year record (2009–2025).
Show all 14 years
Multi-year averages used by the rating model: math 66% (multi-year average, 2009-2025) · reading/ELA 65% (multi-year average, 2009-2025)
* COVID-affected year — test participation was uneven nationwide. This data is weighted at 50% in the Growth score calculation.
Based on 28 test records from MD state assessments and EdFacts (NCES).
Equity & diversity
Shown separately, not included in the overall scoreFree/reduced lunch
55.9%
Students qualifying for federal meal assistance
How we rate schools
A clear 1–10 score built from public data — growth, academics, and learning environment. No hidden criteria, no pay-to-play.
See how we rateThe neighborhood
Where Great Mills High sits, and what the surrounding area looks like.
Nearby same-level schools are colored by their score. Pins are locations, not attendance boundaries.
Getting around & local context
- Walk 23Car-Dependent
- Bike 45Somewhat Bikeable
- County Safety: Elevated1,267/100K
Powered by
FBI Uniform Crime Reporting · 2024 · county context, not school-level safety or attendance eligibility. Source details
Source period: 2024. A newer release may be available.
Area profileU.S. Census ACS 5-year estimates (ACS 2019–2023 5-year estimates)
Median income
$117,431
Median home value
$334,800
Median rent
$1,689/mo
College educated
40.6%
Homeownership
68.3%
Poverty rate
4.3%
ACS 2019–2023 5-year estimates for the ZCTA associated with school ZIP 20634; this is area context, not an attendance boundary.
Programs & students
Programs & Offerings
Compare nearby
Nearby same-level schools
3 from a 5-mile search; district fallback available
| School | Score | Grades | Distance | Enrollment | Compare |
|---|---|---|---|---|---|
| The Kings Christian AcademyPrivate · tuition | 6.0private | PK–12 | 1.6 mi | 333 | Compare → |
| Chopticon HighEnrollment path unverified | 6.1 | 9–12 | Not available | 1,621 | Compare → |
| Leonardtown HighEnrollment path unverified | 6.8 | 9–12 | Not available | 2,072 | Compare → |
Distance is proximity only; it is not attendance eligibility.
Private · tuition: Potential private option; tuition and admission requirements have not been verified.
Enrollment path unverified: Potential public school; its attendance or application path has not been classified.
Public and private scores come from different models and are shown side by side, not blended into one ranking.
St. Mary's County Public Schools
- Schools in district
- 27
- Rank in district
- #22 of 26
- District spending per student
- $17,088NCES F-33 · FY 2023 · This annual source is three years behind the current year.
- District child poverty rate
- 9.3%Census SAIPE · 2024
Great Mills High is listed in St. Mary's County Public Schools; a district label does not verify attendance for an address.
About Great Mills High
Great Mills High is a public high school in Great Mills, MD, part of St. Mary's County Public Schools, serving approximately 1,748 students in grades 9th-12th with a 19.4:1 student-teacher ratio. It holds a MySchoolScout rating of 5.6 out of 10 and ranks #875 of 1,363 schools in MD.
State assessment records show 66% math proficiency (multi-year average, 2009-2025) and 65% reading/ELA proficiency (multi-year average, 2009-2025).
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 ranks #875 of 1,363 schools in MD.
What is Great Mills High's MySchoolScout rating?
Great Mills High has a current MySchoolScout rating of 5.6 out of 10. This score combines the level-appropriate components shown in the rating breakdown; equity data is shown separately for context.
What are the test scores at Great Mills High?
Based on loaded state assessment records, Great Mills High has 66% math proficiency (multi-year average, 2009-2025) and 65% reading/ELA proficiency (multi-year average, 2009-2025).
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.
School factsNCES Common Core of Data (CCD) (SY 2023–24)
- Grades
- 9th – 12th
- Enrollment
- 1,748
- Student-Teacher Ratio
- 19.4:1
- Teachers (FTE)
- 90
- Type
- regular
- Setting
- Small Suburb
- County
- St. Mary's County
- Chronic Absenteeism (SY 2022-23)
- 45.5%
- Phone
- (301) 863-4001
- 4-Year Graduation
- 86.0%
- Area population (ZIP 20634)
- 6,976
- Area average commute
- 23.9 min
- Area median age
- 32.3
About this school's data
Every number on this page comes from a published source with a stated period. Where a source is partial, aging, or describes a surrounding area rather than the school, that limitation is named below.
- School directory (enrollment, grades, staff, contact)
- NCES Common Core of Data (CCD) · SY 2023–24 · Medium confidence
- Source period: SY 2023–24. A newer release may be available.
- MySchoolScout rating and rank
- MySchoolScout ranking model · Low confidence
- Vintage not available. Do not use this measure alone.
- Derived as a weighted blend of the component scores shown in Academics from state assessment, EdFacts growth, and NCES resource records.
- Math proficiency
- State department of education · 2025 MCAP · Low confidence
- Vintage not available. Do not use this measure alone.
- Available for part of the eligible units; results may not represent the full area.
- Derived from source records rather than read directly from one field.
- Reading/ELA proficiency
- State department of education · 2025 MCAP · Low confidence
- Vintage not available. Do not use this measure alone.
- Available for part of the eligible units; results may not represent the full area.
- Derived from source records rather than read directly from one field.
- Student progress (growth)
- NCES EdFacts · Mixed source periods · Low confidence
- Vintage not available. Do not use this measure alone.
- Available for part of the eligible units; results may not represent the full area.
- Derived as the fitted year-over-year slope of proficiency from multi-year assessment records.
- Neighborhood (income, housing, education)
- U.S. Census ACS 5-year estimates · ACS 2019–2023 5-year estimates · Low confidence
- Older source: ACS 2019–2023 5-year estimates. Use as historical context.
- Reported for the ZCTA for ZIP 20634; this does not measure the attendance area.
- Programs (AP/IB, athletics, gifted)
- CRDC via Urban Institute · SY 2021–22 · Medium confidence
- Available for part of the eligible units; results may not represent the full area.
- Source period: SY 2021–22. A newer release may be available.
Evidence periods: Rating mixed/unknown input periods; assessments multi-year average, 2009-2025; directory SY 2023–24
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