Very Good
#76 of 219 schools in DE
Top 34% in state
Mariner Middle School
Middle School · Cape Henlopen School District · Milton, DE
A Cape Henlopen School District middle school serving grades 6th – 8th.
16391 Harbeson Rd, Milton, DE 19968
- Math 40% vs DE 31% (2025)
- Reading 41% vs DE 42% (2025)
- 13.9:1 student-teacher ratio
Academics
Full Profile · 3/3 metricsView breakdown
View breakdown
View breakdown
Students at Mariner Middle School score 41% proficient, which is above what's typical for similar communities (expected: 39%).
2025 DESSA proficiency
Most recent published year. School vs. DE average.
Trend
→ SteadyProficiency is down 35 points across the 17-year record (2009–2025) and has held near 41% recently.
Show all 17 years
Multi-year averages used by the rating model: math 43% (multi-year average, 2009-2025) · reading/ELA 55% (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 90 test records from DE state assessments and EdFacts (NCES).
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 Mariner Middle School 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 22Car-Dependent
- Bike 34Somewhat Bikeable
- City Safety: Elevated1,265/100K
Powered by
FBI Uniform Crime Reporting · 2024 · city context (Milton), not school-level safety or attendance eligibility. Source details
Source period: 2024. Freshness not available.
Area profileU.S. Census ACS 5-year estimates (ACS 2019–2023 5-year estimates)
Median income
$81,646
Median home value
$418,600
Median rent
$1,408/mo
College educated
40.5%
Homeownership
90.3%
Poverty rate
8.4%
ACS 2019–2023 5-year estimates for the ZCTA associated with school ZIP 19968; this is area context, not an attendance boundary.
Programs & students
Programs & Offerings
Compare nearby
Nearby same-level schools
2 from a 5-mile search; district fallback available
| School | Score | Grades | Distance | Enrollment | Compare |
|---|---|---|---|---|---|
| Sussex ConsortiumEnrollment path unverified | 6.2 | PK–12 | 4.5 mi | 441 | Compare → |
| Beacon Middle SchoolEnrollment path unverified | 8.4 | 6–8 | Not available | 705 | Compare → |
Distance is proximity only; it is not attendance eligibility.
Enrollment path unverified: Potential public school; its attendance or application path has not been classified.
Cape Henlopen School District
- Schools in district
- 9
- Rank in district
- #8 of 9
- District spending per student
- $20,712NCES F-33 · FY 2023 · This annual source is three years behind the current year.
- District child poverty rate
- 10.0%Census SAIPE · 2024
Mariner Middle School is listed in Cape Henlopen School District; a district label does not verify attendance for an address.
About Mariner Middle School
Mariner Middle School is a public middle school in Milton, DE, part of Cape Henlopen School District, serving approximately 682 students in grades 6th-8th with a 13.9:1 student-teacher ratio. It holds a MySchoolScout rating of 7.0 out of 10 and ranks #76 of 219 schools in DE. State assessment records show 43% math proficiency (multi-year average, 2009-2025) and 55% reading/ELA proficiency (multi-year average, 2009-2025).
Frequently asked questions
Common questions about Mariner Middle School
What grades does Mariner Middle School serve?
Mariner Middle School serves students in grades 6th through 8th.
How many students attend Mariner Middle School?
Mariner Middle School has an enrollment of approximately 682 students.
What is the student-teacher ratio at Mariner Middle School?
The student-teacher ratio at Mariner Middle School is 13.9:1. A lower ratio generally means more individual attention per student. The national average is approximately 16:1 for public schools.
How does Mariner Middle School rank in DE?
Mariner Middle School ranks #76 of 219 schools in DE.
What is Mariner Middle School's MySchoolScout rating?
Mariner Middle School has a current MySchoolScout rating of 7.0 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 Mariner Middle School?
Based on loaded state assessment records, Mariner Middle School has 43% math proficiency (multi-year average, 2009-2025) and 55% reading/ELA proficiency (multi-year average, 2009-2025).
Is Mariner Middle School a charter school?
No, Mariner Middle School is not a charter school. It is a traditional public school operated by the local school district.
Is Mariner Middle School a Title I school?
No, Mariner Middle School is not currently a Title I school.
School factsNCES Common Core of Data (CCD) (SY 2023–24)
- Grades
- 6th – 8th
- Enrollment
- 682
- Student-Teacher Ratio
- 13.9:1
- Teachers (FTE)
- 49
- Type
- regular
- Setting
- Fringe Rural
- County
- Sussex County
- Chronic Absenteeism (SY 2022-23)
- 28.3%
- Phone
- (302) 685-8516
- Area population (ZIP 19968)
- 14,791
- Area average commute
- 25.4 min
- Area median age
- 54
Official sources & links
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 DESSA · Medium confidence
- Available for part of the eligible units; results may not represent the full area.
- Source period: 2025 DESSA. A newer release may be available.
- Derived from source records rather than read directly from one field.
- Reading/ELA proficiency
- State department of education · 2025 DESSA · Medium confidence
- Available for part of the eligible units; results may not represent the full area.
- Source period: 2025 DESSA. A newer release may be available.
- Derived from source records rather than read directly from one field.
- Student progress (growth)
- State assessments · 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 19968; 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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