- Enrollment
- 2,956
- Students per teacher
- 18.5:1
- Resource Index
- 41/100
Other / mixed grade configuration · Dumfries, VA
Mary Williams Elementary
Federal NCES profile for Mary Williams Elementary, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 52/100.
2024-25 NCES dataOther / mixed grade configurationNCES 510313002455
👥 S:T ratio 40
🌟 Gifted program 70
🎓 Counselors 33
📋 Attendance 63
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Mary Williams Elementary earns 52/100 on the Resource Investment Index, with class sizes near the Virginia median. It is also more racially and ethnically mixed than most Virginia schools.
- #2 of 7
- schools in Dumfries · Resource Index
- 52
- Resource Index · Higher
- 14.9:1
- students per teacher
- 48.3%
- free-lunch eligible
Mary Williams Elementary has class sizes near the Virginia median. Computed live against every Virginia school reporting to NCES.
By Resource Investment Index, Mary Williams Elementary ranks #2 of 7 schools in Dumfries, VA.
School address
District: Prince William County Public Schools · Virginia
NCES ID 510313002455 Verify on NCES CCD record →
CCD year-over-year · 2022-23 → 2023-24
-21 students YoY
Mary Williams Elementary held near 697 students from 2022-23 to 2023-24 (-21 headcount).
Teacher FTE lost 45.3 → 44.4 across the same CCD years.
Source: NCES Common Core of Data public-school universe (2022-23, 2023-24).
Steady CCD campus
-21 students YoY 510313002455 · Dumfries, VA Other · MID · TRAD
669 enr · 14.9:1 · 48.3% lunch · RII 52
Nearest enrollment peer: Charles J. Colgan Sr. High (2,956 students)
Mary Williams Elementary held near 697 students from 2022-23 to 2023-24 (-21 headcount). Teacher FTE lost 45.3 → 44.4 across the same CCD years. Read with this school → · District book → · Virginia schools → · Find another →
Mary Williams Elementary in the enrollment neighbourhood
Fall enrollment among this campus and nearest district peers
- Charles J. Col
Charles J. Colgan Sr. High
2,956 students
- Woodbridge Hig
Woodbridge High
2,898 students
- Osbourn Park H
Osbourn Park High
2,661 students
- Gainesville Hi
Gainesville High
2,648 students
- Gar-Field High
Gar-Field High
2,524 students
- This school 669
Mary Williams Elementary
669 students
What this shows Mary Williams Elementary reports 669 students on the CCD universe file.
How Mary Williams Elementary compares
Mary Williams Elementary held steady on CCD headcount: ratios and free-lunch share vs Virginia and U.S. means.
| Metric | This school | vs Virginia | Virginia avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 14.9:1 | ▲ 7% | 13.9:1 | 15.7:1 |
| Free-lunch eligible | 48.3% | ▼ 16% | 57.6% | 51.7% |
| Enrollment | 669 | top 35% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
14.9:1
Leaner classes than 48% of US schools, a middle-of-the-pack class size.
669
Bigger than 78% of US schools by enrollment, mid-sized for the country.
Equity indicators methodology
Economic need
48.3%
free-lunch eligible
- 16% below the Virginia average of 57.6%
Above the 40% Title I schoolwide threshold; federal funds support the whole school, not individual students.
Staffing depth
14.9:1
students per teacher
- 7% above state mean
Top 67% in Virginia - lower ratio than 33% of state schools
Close to the 15:1 benchmark most often cited for individualized attention.
Engagement
14.8%
chronically absent (missed 10%+ of school days)
In the 10-15% range, above the pre-pandemic national baseline but within the broader post-pandemic picture.
Funding equity
$15,373
per pupil, district-wide
- below Virginia avg of $15,892
Somewhat below the U.S. average per-pupil spend; funding constraints may affect programs, facilities, and staffing.
Support staff
Counselors2.0 FTE
Per 335 students, the combined health-and-guidance staffing load for this school.
Discipline context
4
in-school suspensions + 2 out-of-school
Suspension rate: 0.6 per 100 students. Combined in-school and out-of-school rate: 0.9 per 100 students. Reported via the Civil Rights Data Collection.
Student demographics
African American 34.4%
Hispanic or Latino 27.8%
Asian 17.3%
White 14.6%
Two or More 5.4%
American Indian / Alaska Native 0.3%
Native Hawaiian / Pacific Islander 0.1%
Largest group: African American at 34.4% of enrollment.
Student-body diversity index 75.0/100
Simpson diversity index - at 75.0, Mary Williams Elementary is more mixed than the Virginia school average of 53.7.
Programs
Gifted & talented Yes
District finance for Prince William County Public Schools reports $15,373 per pupil (NCES F-33) - open the district page for the full revenue mix.
How Mary Williams Elementary Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Charles J. Colgan Sr. High | Larger | Lower economic need | Higher S:T ratio |
| Woodbridge High | Larger | Similar economic need | Higher S:T ratio |
| Osbourn Park High | Larger | Similar economic need | Higher S:T ratio |
| Gainesville High | Larger | Lower economic need | Higher S:T ratio |
| Gar-Field High | Larger | Higher economic need | Higher S:T ratio |
Comparisons are relative to Mary Williams Elementary's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 2,898
- Students per teacher
- 17.5:1
- Resource Index
- 38/100
- Enrollment
- 2,661
- Students per teacher
- 16.6:1
- Resource Index
- 42/100
- Enrollment
- 2,648
- Students per teacher
- 20.9:1
- Resource Index
- 41/100
- Enrollment
- 2,524
- Students per teacher
- 16.7:1
- Resource Index
- 49/100
Similar other schools in Dumfries
6 comparable other schools (grades Mixed) serving the same city.
Covington-Harper Elementary
Standard public school
1,025 students 17.7:1 students per teacher
John F. Pattie Sr. Elementary
Standard public school
906 students 12.9:1 students per teacher
A. Henderson Elementary
Standard public school
815 students 18.1:1 students per teacher
Swans Creek Elementary
Standard public school
619 students 16.3:1 students per teacher
Montclair Elementary
Standard public school
588 students 15.1:1 students per teacher
Dumfries Elementary
Standard public school
441 students 13:1 students per teacher
Nationwide other schools with similar size or staffing
Out-of-state peers matched by enrollment and by student-teacher ratio, not the same-city or same-district lists above.
Similar enrollment (~669 students)
Frequently asked questions about Mary Williams Elementary
How many students attend Mary Williams Elementary?
Mary Williams Elementary has 669 students enrolled. It is a public school in Dumfries, VA. CCD year-over-year: 718 (2022-23) → 697 (2023-24), nearly flat (-21).
What is the student-teacher ratio at Mary Williams Elementary?
The student-teacher ratio at Mary Williams Elementary is 14.9:1, which is 7% higher than the Virginia average of 13.9:1 and 5% lower than the national average of 15.7:1.
What percentage of students receive free lunch at Mary Williams Elementary?
48.3% of students at Mary Williams Elementary are eligible for free lunch, compared to the Virginia average of 57.6%.
What is the racial and ethnic makeup of Mary Williams Elementary?
The largest demographic group at Mary Williams Elementary is African American at 34.4% of enrollment, in Dumfries, VA. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 75.0/100.
What is the Resource Investment Index for Mary Williams Elementary?
Mary Williams Elementary has a Resource Investment Index of 52/100 (higher reported resources relative to schools nationally) based on 4 factors: student-teacher ratio, gifted-program reporting, counselor availability, chronic absenteeism. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Mary Williams Elementary rank among schools in Dumfries?
By Resource Investment Index, Mary Williams Elementary ranks #2 of 7 schools in Dumfries, VA. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all schools in Dumfries on the city page.
What other schools are in Prince William County Public Schools?
Besides Mary Williams Elementary, Prince William County Public Schools also operates Charles J. Colgan Sr. High (2,956 students), Woodbridge High (2,898 students), and Osbourn Park High (2,661 students). See the Prince William County Public Schools district page for the complete list.