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SCHOOL COMMUNITY·PRINCE WILLIAM COUNTY PUBLIC SCHOOLS·NCES 510313002455

Mary Williams Elementary

3100 Panther Pride Drive, Dumfries, VA 22026 · (703) 445-8376 · Prince William County
GRADES PK–05ELEMENTARY21-SUBURBTITLE IREGULAR SCHOOL669 STUDENTS
Enrollment
669
Elementary
DISTRICT 636 · STATE 499
Student : Teacher
15.9:1
42 FTE teachers
DISTRICT 15.8:1 · STATE 13.8:1
Free / Reduced Lunch
71%
474 students
DISTRICT 57% · STATE 66%
Community
1
0 members
Enrollment and student:teacher ratio compared against other elementary schools. Free/Reduced Lunch and demographics compared against all schools.

Enrollment by grade, 2024-25

GradeStudentsShare
Pre-K447%
Kindergarten10215%
Grade 19013%
Grade 211317%
Grade 310616%
Grade 411016%
Grade 510416%

This year's kindergarten class (102) is about the same size as its 5th grade class (104).

Student demographics
75%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 74% · STATE 71% · US 70%
White
9815%
DISTRICT 26% · STATE 43% · US 43%
Hispanic
18628%
DISTRICT 37% · STATE 20% · US 30%
Black
23034%
DISTRICT 19% · STATE 21% · US 15%
Asian
11617%
DISTRICT 12% · STATE 8% · US 6%
Two+
365%
DISTRICT 6% · STATE 7% · US 5%
Native American
20%
DISTRICT 0% · STATE 0% · US 1%
Pacific Islander
10%
DISTRICT 0% · STATE 0% · US 0%
Student head counts by race/ethnicity from federal NCES enrollment data. District, state, and US figures are each group's share of all public school students in that area (US excludes territories). Very small groups may be suppressed in the source, so categories do not always sum exactly to total enrollment.
Gender split
Male
35453%
Female
31547%

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Test scores

SOL 2024-25 . % Passing
English Language Arts
70.0%
VA avg 74.2% . +4.0pp since 2022
Math
72.0%
VA avg 72.7% . +6.0pp since 2022

What this means: On the SOL, Virginia's statewide test, about 70 of every 100 students at this school read and write at grade level and about 72 of 100 do math at grade level. Across all Virginia schools, those numbers are about 74 and 73. Reading and writing scores are up about 4 points since 2022, while math scores are up about 6 points.

SOL results by year

School yearEnglish Language ArtsMath
2024-2570.0%72.0%
2023-2468.0%74.0%
2022-2366.0%66.0%
% Passing, all students and all tested grades.
Source: SOL. All students, all grades. See all years and grades →

BeatsExpectations

Demographically-adjusted score · methodology
Tier
AS EXPECTED
Performing as predicted given the school's student profile
Actual proficiency
70.3%
composite math + reading, all grades
Predicted
68.8%
based on VA schools with similar FRL share
Beats by
+1.4pp
above demographic expectation

What this means: About 70% of students here test proficient in math and reading, compared with the roughly 69% typical for Virginia schools with a similar share of low-income students. BeatsExpectations measures results against demographically similar schools rather than by raw scores, and this school falls within the typical range, neither among Virginia's top nor bottom 10%.

BeatsExpectations runs a per-state regression of proficiency on free/reduced-lunch share, then scores each school by residual. How this is calculated →

Schools most like Mary Williams Elementary

Mary Williams Elementary's state test result (70.3% proficient) is higher than 3 of the 5 schools below with a result.

SchoolStudentsLow-incomeProficient
Mary Williams Elementary this school66970.9%70.3%
Lorton Station Elementary
Lorton
74570.2%60.2%
Swans Creek Elementary
Dumfries
61970.9%70.9%
Leesylvania Elementary
Woodbridge
75970.8%70.9%
River Oaks Elementary
Woodbridge
66271.8%52.9%
Samuel W. Tucker Elementary
Alexandria
73577.0%63.8%
Matched among Virginia elementary schools on enrollment, the share of students from low-income families (eligible for free or reduced-price lunch), and racial and ethnic makeup. Proficient is the average share of students meeting the state standard across all of the school's state tests in 2023-24 and 2024-25, the same combined score our test-score rankings use. Online schools and schools serving specialized populations are not matched.

Where Mary Williams Elementary ranks

Among elementary schools
MeasureThis schoolIn VirginiaIn Prince William County
State test proficiency
ranked highest first
70.3%#585 of 1,101#44 of 64
Math proficiency
ranked highest first
72.0%#633 of 1,111
▼ 114
#49 of 64
▼ 8
Reading proficiency
ranked highest first
70.0%#610 of 1,111
▲ 57
#45 of 64
▲ 5
Enrollment
ranked largest first
669#234 of 1,176#24 of 64
Students per teacher
ranked fewest first
15.9:1#903 of 1,105#35 of 64
Diversity index
ranked most diverse first
75.0%#55 of 1,106#13 of 64
Free and reduced lunch
ranked highest share first
70.9%#651 of 1,157#16 of 64
Enrollment change since 2017-18
ranked steepest decline first
-10.9%#412 of 759#24 of 45
Ranked against other public elementary schools. Online schools are left out of every list, and test-score lists leave out schools that serve specialized populations. Each rank links to the full list. Arrows under a test-score rank show places moved since the prior test year, among schools tested both years.

4-year change

SY 2020-21 vs SY 2024-25
Enrollment
669
-11 (-2%) vs 2020
-17% since 2010-11, when it was 810
Student : Teacher
15.9:1
was 15.1:1
Source: NCES Common Core of Data

Enrollment and staffing by year

School yearStudentsTeachers (FTE)Students per teacherFree and reduced lunch
2024-2566942.215.9:171% (474)
2023-2469744.415.7:161% (424)
2022-2371845.315.9:157% (408)
2020-216804515.1:1N/A
2017-1875146.316.2:137% (280)
2015-169845617.6:142% (410)
2010-118104617.6:141% (331)
Source: NCES Common Core of Data. Rows are the federal collections on file for Mary Williams Elementary.

Since 2017-18: students down 11% (751 to 669); teachers down 9% (46.3 to 42.2).

About Mary Williams Elementary

Mary Williams Elementary is a medium-sized elementary school in Dumfries, Virginia. Students in pre-K through 5 attend, and enrollment is 669 students. The school's enrollment is 34% larger than the 499 average for elementary schools in Virginia.

Within Prince William County Public Schools, Mary Williams Elementary is one of 95 schools. The district enrolls 90,242 students.

No single group makes up more than half of enrollment at Mary Williams Elementary. The largest is Black students, at 34%. The next largest groups are 28% Hispanic, 17% Asian, 15% White, and 5% multiracial. In Prince William County overall, about 20% of residents are Black. The school's diversity index is 75%, meaning two students picked at random have a 75% chance of belonging to different racial or ethnic groups.

Teachers at the school number 42.2 full-time equivalents, and the ratio is 15.9:1. This ratio sits 2.0 above the 13.8:1 average for elementary schools in Virginia. Roughly 71% of the student body qualifies for free or reduced-price lunch. Across public schools in Prince William County, the average is 55%.

Mary Williams Elementary posts an average proficiency rate on state tests of 70.3%, compared with a predicted 68.8%. It is not in the top or bottom 10% of Virginia schools on BeatsExpectations.

Federal survey data for Prince William County show that the median household income is $131,402, 45% of adults hold a bachelor's degree or higher, and about 5% of people live in poverty. There are 102 public schools in Prince William County, enrolling about 89,591 students in all.

The nearest public school is Potomac Middle, at about 0.2 miles. Inside a five-mile radius, there are at least 8 other public schools. Mary Williams Elementary comes in 5th of 9 nearby schools on average proficiency.

In the federal locale system, Mary Williams Elementary is coded Suburb: Large, for schools in a suburban area outside a principal city, within an urbanized area with a population of 250,000 or more.

Enrollment has been fairly stable: 680 in 2020-21 and 669 in 2024-25.

If you have questions about school safety, transportation, and start times at Mary Williams Elementary, you can post them here. Anyone with firsthand experience at this school can post or comment.

Prince William County at a glance

View full county profile
Population
488,880
Census ACS
Median income
$131,402
Household, ACS
Bachelor's+
45%
Adults 25+
Poverty rate
5%
Below federal line
Schools in county
102
89,591 students

Quick facts

School name
Mary Williams Elementary
District
Prince William County Public Schools
Address
3100 Panther Pride Drive, Dumfries, VA 22026
Phone
(703) 445-8376
County
Prince William County
Level
Elementary
Grade range
PK–05
Total enrollment
669
Teachers (FTE)
42
Student–teacher ratio
15.9:1
Free and reduced lunch
474 (71%)
Locale
21-Suburb: Large
NCES ID
510313002455
Charter school
No
Virtual school
No

Related schools

Other schools in Prince William County Public Schools
Other schools in Dumfries
Nearby schools

Frequently asked questions

About Mary Williams Elementary
What is the total enrollment at Mary Williams Elementary?
Mary Williams Elementary enrolls approximately 669 students in grades PK-05.
What grades does Mary Williams Elementary serve?
Mary Williams Elementary serves grades PK-05.
What is the student-teacher ratio at Mary Williams Elementary?
The student-to-teacher ratio at Mary Williams Elementary is approximately 15.9:1 (42 FTE teachers).
What is the racial breakdown of students at Mary Williams Elementary?
At Mary Williams Elementary, the student body is approximately 15% White, 28% Hispanic, 34% Black, 17% Asian, 5% Two or more.
Who oversees Mary Williams Elementary?
Mary Williams Elementary is overseen by Prince William County Public Schools in Prince William County.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.
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