Enrollment
465
Delaware · 2024-25 NCES data
Elementary school (grades K-5) · Wilmington, DE
Marbrook Elementary School
Federal NCES profile for Marbrook Elementary School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 57/100.
2024-25 NCES dataElementary school (grades K-5)NCES 100130000255
👥 S:T ratio 51
🌟 Gifted program 70
🎓 Counselors 54
📋 Attendance 55
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Marbrook Elementary School earns 57/100 on the Resource Investment Index, with class sizes smaller than 71% of Delaware schools.
- #3 of 24
- elementary schools in Wilmington · Resource Index
- 57
- Resource Index · Higher
- 12.2:1
- small classes for Delaware
- 465
- students enrolled
Marbrook Elementary School has class sizes smaller than 71% of Delaware schools. Computed live against every Delaware school reporting to NCES.
By Resource Investment Index, Marbrook Elementary School ranks #3 of 24 elementary schools in Wilmington, DE.
School address
District: Red Clay Consolidated School District · Delaware
NCES ID 100130000255 Verify on NCES CCD record →
Teachers (FTE)
38.0
Federal CCD staff survey
Students per teacher
12.2:1
vs 13.9:1 Delaware avg
-12% vs state
Student-teacher ratio in context
How Marbrook Elementary School compares with Delaware and U.S. medians
What stands out at Marbrook Elementary School
Marbrook Elementary School is a mid-sized elementary school in Wilmington, Delaware, enrolling 465 students.
Class sizes run a bit leaner than typical: 12.2:1 puts it in the smaller third of Delaware schools by student-teacher ratio.
With 465 students, its enrollment sits close to the Delaware median campus size.
Its Resource Investment Index outscores 96% of the 222 Delaware schools with a score on record, a top-tier result on this measure.
Its student body is led by Hispanic or Latino (51%) and White (36%) (diversity index 60/100).
Counselor coverage is strong, about 233 students per counselor, inside the American School Counselor Association's recommended 250:1.
Attendance runs somewhat below the norm, with 18.1% of students chronically absent per the 2021-22 civil-rights collection.
The surrounding Red Clay Consolidated School District spends $21,267 per pupil, 25% above the Delaware average, a better-resourced district than most.
Among Wilmington's elementary schools, it stands alongside Brandywine Springs School (941 students): Marbrook Elementary School is smaller than that campus by headcount and runs leaner classes (12.2:1 vs 15.4:1).
Red Clay Consolidated School District also operates Conrad Schools of Science (1,164 students) and Dickinson (John) School (1,027 students) alongside Marbrook Elementary School.
Sourced from NCES CCD, CRDC, and F-33 (federal records, not a quality verdict). How we source and compute this.
Source: National Center for Education Statistics Common Core of Data + CRDC + F-33 · 2024-25
How Marbrook Elementary School compares
Marbrook Elementary School on the metrics families compare, against Delaware and U.S. means.
| Metric | This school | vs Delaware | Delaware avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 12.2:1 | ▼ 12% | 13.9:1 | 15.7:1 |
| Enrollment | 465 | top 58% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
12.2:1
Leaner classes than 74% of US schools, among the more generously staffed nationally.
465
Bigger than 57% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Staffing depth
12.2:1
students per teacher
- 12% below state mean
Top 29% in Delaware - lower ratio than 71% of state schools
Well under the widely cited 15:1 individualized-attention benchmark, among the leaner class loads nationally.
Engagement
18.1%
chronically absent (missed 10%+ of school days)
In the 15-20% range, nearing the "high" absenteeism threshold.
Funding equity
$21,267
per pupil, district-wide
- above Delaware avg of $16,990
Well above the U.S. public-school average, reflecting substantially higher local or state investment per enrolled student.
Support staff
Counselors2.0 FTE
Per 233 students, the combined health-and-guidance staffing load for this school.
Discipline context
5
in-school suspensions + 8 out-of-school
Suspension rate: 1.1 per 100 students. Combined in-school and out-of-school rate: 2.8 per 100 students. Reported via the Civil Rights Data Collection.
Overview
- Common Core of Data (June 2026): enrollment, staffing, and the student-teacher ratio above.
- Civil Rights Data Collection: discipline counts and program access (AP, gifted, special education).
- F-33 School District Finance Survey: the district-wide per-pupil spending figures below.
Three separate federal collections, each on its own reporting cadence - which is why this school's numbers line up on a consistent basis against every other school and state on this site, rather than mixing figures pulled from different survey years.
Student demographics
Hispanic or Latino 51.2%
White 35.9%
African American 9.2%
Two or More 2.2%
Asian 1.3%
Native Hawaiian / Pacific Islander 0.2%
Largest group: Hispanic or Latino at 51.2% of enrollment.
Student-body diversity index 60.0/100
Simpson diversity index - at 60.0, Marbrook Elementary School is about as mixed as the Delaware school average of 61.3.
Programs
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for Red Clay Consolidated School District, which includes Marbrook Elementary School.
$21,267
Per student
+25%
vs Delaware
Avg $16,990
+28%
vs U.S.
Avg $16,593
Revenue mix
Local 37.2%
State 48.1%
Federal 14.7%
Source: NCES F-33 School District Finance Survey District-level finance · FY 2021-22 Per-pupil expenditure reflects the district-wide average. Individual school budgets are not reported at the federal level.
How Marbrook Elementary School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Conrad Schools of Science | Larger | No free-lunch data | Higher S:T ratio |
| Dickinson (John) School | Larger | No free-lunch data | Higher S:T ratio |
| Calloway (Cab) School of the Arts | Larger | No free-lunch data | Higher S:T ratio |
| Brandywine Springs School | Larger | No free-lunch data | Higher S:T ratio |
| Mckean (Thomas) High School | Larger | No free-lunch data | Similar S:T ratio |
Comparisons are relative to Marbrook Elementary School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,164
- Students per teacher
- 17.9:1
- Resource Index
- 40/100
- Enrollment
- 1,027
- Students per teacher
- 16:1
- Resource Index
- 34/100
- Enrollment
- 941
- Students per teacher
- 18.1:1
- Resource Index
- 43/100
- Enrollment
- 941
- Students per teacher
- 15.4:1
- Resource Index
- 47/100
- Enrollment
- 920
- Students per teacher
- 13:1
- Resource Index
- 33/100
Similar elementary schools in Wilmington
6 comparable elementary schools (grades K-5) serving the same city.
Brandywine Springs School
Standard public school
941 students 15.4:1 students per teacher
Mount Pleasant Elementary School
Standard public school
674 students 12.5:1 students per teacher
First State Montessori Academy
Standard public school
657 students 19.3:1 students per teacher
Kuumba Academy Charter School
Standard public school
594 students 10.2:1 students per teacher
The Bayard School
Standard public school
571 students 10.4:1 students per teacher
Edison (Thomas a.) Charter School
Standard public school
557 students 15.1:1 students per teacher
Similar elementary schools statewide
Matched by enrollment size and by staffing ratio across all of Delaware, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~465 students)
Next steps
Verify locally before acting on Marbrook Elementary School's federal record.
- Compare Marbrook Elementary School against another school. Compare schools
- Red Clay Consolidated School District's spending and staffing shape this school. District profile
- Confirm current enrollment and boundaries with the school. Choosing guide
Federal record (CCD 2024-25, CRDC 2021-22) - PlainSchools assigns no subjective rating; the composite quality score is a transparent, reproducible index computed from this cited federal data.
Frequently asked questions about Marbrook Elementary School
How many students attend Marbrook Elementary School?
Marbrook Elementary School has 465 students enrolled. It is an elementary school in Wilmington, DE.
What is the student-teacher ratio at Marbrook Elementary School?
The student-teacher ratio at Marbrook Elementary School is 12.2:1, which is 12% lower than the Delaware average of 13.9:1 and 22% lower than the national average of 15.7:1. Lower ratios generally mean more individual attention per student.
What is the racial and ethnic makeup of Marbrook Elementary School?
The largest demographic group at Marbrook Elementary School is Hispanic or Latino at 51.2% of enrollment, in Wilmington, DE. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 60.0/100.
What is the Resource Investment Index for Marbrook Elementary School?
Marbrook Elementary School has a Resource Investment Index of 57/100 (higher reported resources relative to schools nationally) based on 4 factors: student-teacher ratio, counselor availability, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Marbrook Elementary School rank among elementary schools in Wilmington?
By Resource Investment Index, Marbrook Elementary School ranks #3 of 24 elementary schools in Wilmington, DE. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all elementary schools in Wilmington on the city page.
Is Marbrook Elementary School a good school?
Marbrook Elementary School earns 57/100 on the Resource Investment Index, with class sizes smaller than 71% of Delaware schools. This is a resource snapshot, not an academic rating; see the Resource Investment Index question above for what the number does and doesn't measure.
What other schools are in Red Clay Consolidated School District?
Besides Marbrook Elementary School, Red Clay Consolidated School District also operates Conrad Schools of Science (1,164 students), Dickinson (John) School (1,027 students), and Calloway (Cab) School of the Arts (941 students). See the Red Clay Consolidated School District district page for the complete list.
Related tools
Every figure on PlainSchools is rendered directly from the source NCES, CRDC and F-33 federal records, no number is typed in by an editor. Each school's figures reflect its most recent NCES/CRDC submission on file. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of June 2026.