1
Enrollment
636
Elementary
DISTRICT 560 · STATE 499
SCHOOL COMMUNITY·LOUDOUN COUNTY PUBLIC SCHOOLS·NCES 510225002540
Mill Run Elementary
42940 Ridgeway Drive, Ashburn, VA 20148 · (571) 252-2160 · Loudoun County
GRADES PK–05ELEMENTARY21-SUBURBREGULAR SCHOOL636 STUDENTS
Student : Teacher
13.4:1
47 FTE teachers
DISTRICT 12.0:1 · STATE 13.8:1
Free / Reduced Lunch
11%
67 students
DISTRICT 31% · 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
| Grade | Students | Share |
|---|---|---|
| Kindergarten | 76 | 12% |
| Grade 1 | 82 | 13% |
| Grade 2 | 111 | 17% |
| Grade 3 | 134 | 21% |
| Grade 4 | 112 | 18% |
| Grade 5 | 121 | 19% |
This year's kindergarten class (76) is 37% smaller than its 5th grade class (121).
Student demographics
68%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 73% · STATE 71% · US 70%
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
Test scores
SOL 2024-25 . % PassingEnglish Language Arts
91.0%
VA avg 74.2% . +1.0pp since 2022
Math
93.0%
VA avg 72.7% . -1.0pp since 2022
What this means: On the SOL, Virginia's statewide test, about 91 of every 100 students at this school read and write at grade level and about 93 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 1 points since 2022, while math scores are down about 1 points.
SOL results by year
| School year | English Language Arts | Math |
|---|---|---|
| 2024-25 | 91.0% | 93.0% |
| 2023-24 | 91.0% | 94.0% |
| 2022-23 | 90.0% | 94.0% |
% Passing, all students and all tested grades.
Source: SOL. All students, all grades. See all years and grades →
BeatsExpectations
Demographically-adjusted score · methodologyTier
AS EXPECTED
Performing as predicted given the school's student profile
Actual proficiency
92.4%
composite math + reading, all grades
Predicted
85.2%
based on VA schools with similar FRL share
Beats by
+7.1pp
above demographic expectation
What this means: About 92% of students here test proficient in math and reading, compared with the roughly 85% 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 Mill Run Elementary
Mill Run Elementary's state test result (92.4% proficient) is higher than 4 of the 4 schools below with a result.
| School | Students | Low-income | Proficient |
|---|---|---|---|
| Mill Run Elementary this school | 636 | 10.5% | 92.4% |
| Oak Hill Elementary Herndon | 628 | 8.3% | 88.7% |
| Hillside Elementary Ashburn | 656 | 16.6% | 86.9% |
| Henrietta Lacks Elementary Aldie | 780 | 8.6% | N/A |
| Westbriar Elementary Vienna | 840 | 8.9% | 91.2% |
| Shady Grove Elementary Glen Allen | 600 | 11.3% | 88.8% |
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 Mill Run Elementary ranks
Among elementary schools| Measure | This school | In Virginia | In Loudoun County |
|---|---|---|---|
| State test proficiency ranked highest first | 92.4% | #26 of 1,101 | #1 of 58 |
| Math proficiency ranked highest first | 93.0% | #49 of 1,111 ▼ 29 | #3 of 59 ▼ 2 |
| Reading proficiency ranked highest first | 91.0% | #56 of 1,111 ▼ 5 | #2 of 59 ▼ 1 |
| Enrollment ranked largest first | 636 | #285 of 1,176 | #24 of 62 |
| Students per teacher ranked fewest first | 13.4:1 | #429 of 1,105 | #49 of 56 |
| Diversity index ranked most diverse first | 67.7% | #308 of 1,106 | #22 of 56 |
| Free and reduced lunch ranked highest share first | 10.5% | #1,114 of 1,157 | #51 of 59 |
| Enrollment change since 2017-18 ranked steepest decline first | -30.1% | #45 of 759 | #6 of 46 |
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 2024-25Enrollment
636
-61 (-9%) vs 2020
+62% since 2000-01, when it was 392
Student : Teacher
13.4:1
was 14.8:1
Source: NCES Common Core of Data
Enrollment and staffing by year
| School year | Students | Teachers (FTE) | Students per teacher | Free and reduced lunch |
|---|---|---|---|---|
| 2024-25 | 636 | 47.4 | 13.4:1 | 11% (67) |
| 2023-24 | 648 | 48.7 | 13.3:1 | 7% (44) |
| 2022-23 | 677 | 47 | 14.4:1 | 7% (50) |
| 2020-21 | 697 | 47 | 14.8:1 | N/A |
| 2017-18 | 910 | 47.5 | 19.2:1 | 3% (29) |
| 2015-16 | 875 | 43 | 20.4:1 | 2% (18) |
| 2010-11 | 893 | 41 | 21.8:1 | 4% (39) |
| 2000-01 | 392 | 29 | 13.5:1 | 3% (12) |
Source: NCES Common Core of Data. Rows are the federal collections on file for Mill Run Elementary.
Since 2017-18: students down 30% (910 to 636); teachers unchanged (47.5 to 47.4).
About Mill Run Elementary
In Ashburn, Virginia, Mill Run Elementary is a mid-sized elementary school. The school teaches pre-K through 5 and enrolls 636 students. The school is 27% above the average for elementary schools in Virginia.
Mill Run Elementary is one of the 98 schools that make up Loudoun County Public Schools (81,486 students in total).
Of every 100 students at Mill Run Elementary, about 41 are White, the largest group. Other students are 38% Asian, 7% Black, 7% multiracial, and 6% Hispanic. That is lower than the 53% White share among all Loudoun County residents. A diversity index of 68% means there is a 68% chance two randomly chosen students at Mill Run Elementary are from different groups.
Mill Run Elementary has 47.4 full-time-equivalent teachers on staff and a student-to-teacher ratio of 13.4:1. It is about the same as the 13.8:1 average for elementary schools in Virginia. The school has 11% of students eligible for free or reduced-price lunch. The gap from the 28% average for public schools in Loudoun County is 17 points.
On the allk12 BeatsExpectations measure, Mill Run Elementary is 7.1 points above the average proficiency rate across its state test results predicted for its free or reduced-price lunch share: 92.4% actual, 85.2% predicted. That is outside both the top and bottom 10% in Virginia.
For Loudoun County, Census Bureau data show the median household earns about $181,765 a year, roughly 65% of adults have a four-year degree or more, and the share of residents below the poverty line is 3%. Public schools in Loudoun County number 103, with about 81,486 students.
Among nearby public schools, Eagle Ridge Middle is closest at about 0.2 miles. Mill Run Elementary is one of several public schools in the area, with at least 8 others within five miles. Among 9 nearby schools that report test results, Mill Run Elementary ranks 1st on proficiency.
Mill Run Elementary has an NCES locale of Suburb: Large.
Between 2020-21 and 2024-25, Mill Run Elementary had a net loss of 61 students, or 9%. The school's ratio dropped from 14.8:1 to 13.4:1 between 2020-21 and 2024-25.
The allk12 page for Mill Run Elementary lets the school community talk about pickup and drop-off, after-school programs, and teacher feedback. Current and former families are welcome to add their experience.
Loudoun County at a glance
View full county profilePopulation
432,998
Census ACS
Median income
$181,765
Household, ACS
Bachelor's+
65%
Adults 25+
Poverty rate
3%
Below federal line
Schools in county
103
81,486 students
Quick facts
Related schools
Other schools in Loudoun County Public Schools
- Independence HighHigh · 2,166 students
- Lightridge HighHigh · 2,030 students
- Freedom HighHigh · 1,885 students
- Briar Woods HighHigh · 1,862 students
- John Champe HighHigh · 1,851 students
- Riverside HighHigh · 1,710 students
Other schools in Ashburn
- Independence HighHigh · 2,166 students
- Briar Woods HighHigh · 1,862 students
- Stone Bridge HighHigh · 1,629 students
- Rock Ridge HighCombined · 1,599 students
- Broad Run HighHigh · 1,558 students
- Eagle Ridge MiddleMiddle · 1,258 students
Nearby schools
- Eagle Ridge Middle0.2 mi · 1,258
- Hillside Elementary0.6 mi · 656
- Waxpool Elementary0.8 mi · 678
- Moorefield Station Elementary1.0 mi · 963
- Broad Run High1.5 mi · 1,558
- Briar Woods High1.6 mi · 1,862
Frequently asked questions
About Mill Run ElementaryWhat is the total enrollment at Mill Run Elementary?
Mill Run Elementary enrolls approximately 636 students in grades PK-05.
What age range does Mill Run Elementary serve?
Mill Run Elementary serves students from grade PK through grade 05.
How many students per teacher at Mill Run Elementary?
Approximately 13.4:1 students per teacher at Mill Run Elementary.
What is the racial breakdown of students at Mill Run Elementary?
At Mill Run Elementary, the student body is approximately 41% White, 6% Hispanic, 7% Black, 38% Asian, 7% Two or more.
Is Mill Run Elementary public or private?
Mill Run Elementary is a public K-12 school, overseen by Loudoun County Public Schools.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.