Mariner Middle School
Public
Middle Grades 6–8 B+School Grade
Part of Cape Henlopen School District
16391 Harbeson Rd, Milton, DE 19968 · (302) 685-8516
Community ratings
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Academic performance
Math proficiency32%
State average 26.5%
Reading / language arts48%
State average 41.9%
EDFacts via Urban Institute Education Data Portal (SY2020-21)
At a glance
552Students enrolled
12:1Student–teacher ratio
RuralSetting
Regular SchoolSchool type
Enrollment by grade
Grade 6186
Grade 7191
Grade 8175
Students
White · 55%302
Hispanic · 27%151
Black · 11%61
Two or more races · 6%33
Asian · 1%4
Native Hawaiian/Pacific Islander · 0%1
Counts as reported to NCES; percentages are of students with a reported race/ethnicity.
Enrollment · last 5 years
624’20
658’21
664’22
682’23
552’24
Location
16391 Harbeson Rd Milton
Neighbor reviews
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School facts from the U.S. Department of Education (NCES), 2024-2025 school year. Academic scores from the EDFacts via Urban Institute Education Data Portal (SY2020-21). Community ratings and reviews reflect neighbor opinions, not an official measure of school quality.