- Enrollment
- 4,411
- Students per teacher
- 17:1
- Resource Index
- 57/100
Other / mixed grade configuration · Clifton, VA
Union Mill Elementary
Federal NCES profile for Union Mill Elementary, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 48/100.
2024-25 NCES dataOther / mixed grade configurationNCES 510126002060
👥 S:T ratio 33
🌟 Gifted program 70
🎓 Counselors 13
📋 Attendance 78
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Union Mill Elementary earns 48/100 on the Resource Investment Index, with class sizes larger than 89% of Virginia schools.
- #2 of 3
- public schools in Clifton · Resource Index
- 48
- Resource Index · Typical
- 16.8:1
- large classes for Virginia
- 10.4%
- free-lunch eligible
Union Mill Elementary has class sizes larger than 89% of Virginia schools. Computed live against every Virginia school reporting to NCES.
By Resource Investment Index, Union Mill Elementary ranks #2 of 3 public schools in Clifton, VA.
School address
District: Fairfax County Public Schools · Virginia
NCES ID 510126002060 Verify on NCES CCD record →
CCD year-over-year · 2022-23 → 2023-24
+13 students YoY
Union Mill Elementary held near 908 students from 2022-23 to 2023-24 (+13 headcount).
Teacher FTE added 52.8 → 53.3 across the same CCD years.
Source: NCES Common Core of Data public-school universe (2022-23, 2023-24).
Steady CCD campus
+13 students YoY 510126002060 · Clifton, VA Other · MID · TRAD
874 enr · 16.8:1 · 10.4% lunch · RII 48
Nearest enrollment peer: Lake Braddock Secondary (4,411 students)
Union Mill Elementary held near 908 students from 2022-23 to 2023-24 (+13 headcount). Teacher FTE added 52.8 → 53.3 across the same CCD years. Read with this school → · District book → · Virginia schools → · Find another →
Union Mill Elementary in the enrollment neighbourhood
Fall enrollment among this campus and nearest district peers
- Lake Braddock
Lake Braddock Secondary
4,411 students
- Robinson Secon
Robinson Secondary
3,710 students
- Hayfield Secon
Hayfield Secondary
3,256 students
- Chantilly High
Chantilly High
2,937 students
- West Springfie
West Springfield High
2,799 students
- This school 874
Union Mill Elementary
874 students
What this shows Union Mill Elementary reports 874 students on the CCD universe file.
How Union Mill Elementary compares
Union Mill 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 | 16.8:1 | ▲ 21% | 13.9:1 | 15.7:1 |
| Free-lunch eligible | 10.4% | ▼ 82% | 57.6% | 51.7% |
| Enrollment | 874 | top 19% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
16.8:1
Leaner classes than 32% of US schools, heavier class loads than most.
874
Bigger than 88% of US schools by enrollment, a large campus nationally.
Equity indicators methodology
Economic need
10.4%
free-lunch eligible
- 82% below the Virginia average of 57.6%
Below the 40% Title I threshold, among the lower-need profiles in the state; federal aid targets individual qualifying students rather than schoolwide programs.
Staffing depth
16.8:1
students per teacher
- 21% above state mean
Top 89% in Virginia - lower ratio than 11% of state schools
Between 16:1 and 20:1, squarely in the typical U.S. public-school staffing range.
Engagement
9.0%
chronically absent (missed 10%+ of school days)
In the 5-10% range, close to the pre-pandemic national baseline.
Funding equity
$18,975
per pupil, district-wide
- above Virginia avg of $15,892
Somewhat above the U.S. public-school average, reflecting higher local or state investment per enrolled student.
Support staff
Counselors2.0 FTE
Per 437 students, the combined health-and-guidance staffing load for this school.
Discipline context
6
in-school suspensions + 6 out-of-school
Suspension rate: 0.7 per 100 students. Combined in-school and out-of-school rate: 1.4 per 100 students. Reported via the Civil Rights Data Collection.
Student demographics
White 59.4%
Asian 16.2%
Hispanic or Latino 10.6%
Two or More 8.8%
African American 4.8%
Native Hawaiian / Pacific Islander 0.1%
Largest group: White at 59.4% of enrollment.
Student-body diversity index 60.0/100
Simpson diversity index - at 60.0, Union Mill Elementary is more mixed than the Virginia school average of 53.7.
Programs
Gifted & talented Yes
District finance for Fairfax County Public Schools reports $18,975 per pupil (NCES F-33) - open the district page for the full revenue mix.
How Union Mill Elementary Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Lake Braddock Secondary | Larger | Similar economic need | Similar S:T ratio |
| Robinson Secondary | Larger | Similar economic need | Similar S:T ratio |
| Hayfield Secondary | Larger | Higher economic need | Similar S:T ratio |
| Chantilly High | Larger | Similar economic need | Similar S:T ratio |
| West Springfield High | Larger | Similar economic need | Higher S:T ratio |
Comparisons are relative to Union Mill Elementary's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 3,710
- Students per teacher
- 17.1:1
- Resource Index
- 54/100
- Enrollment
- 3,256
- Students per teacher
- 17.3:1
- Resource Index
- 53/100
- Enrollment
- 2,937
- Students per teacher
- 16.2:1
- Resource Index
- 47/100
- Enrollment
- 2,799
- Students per teacher
- 18.5:1
- Resource Index
- 45/100
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 (~874 students)
Frequently asked questions about Union Mill Elementary
How many students attend Union Mill Elementary?
Union Mill Elementary has 874 students enrolled. It is a public school in Clifton, VA. CCD year-over-year: 895 (2022-23) → 908 (2023-24), nearly flat (+13).
What is the student-teacher ratio at Union Mill Elementary?
The student-teacher ratio at Union Mill Elementary is 16.8:1, which is 21% higher than the Virginia average of 13.9:1 and 7% higher than the national average of 15.7:1.
What percentage of students receive free lunch at Union Mill Elementary?
10.4% of students at Union Mill Elementary are eligible for free lunch, compared to the Virginia average of 57.6%.
What is the racial and ethnic makeup of Union Mill Elementary?
The largest demographic group at Union Mill Elementary is White at 59.4% of enrollment, in Clifton, VA. 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 Union Mill Elementary?
Union Mill Elementary has a Resource Investment Index of 48/100 (typical 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 Union Mill Elementary rank among public schools in Clifton?
By Resource Investment Index, Union Mill Elementary ranks #2 of 3 public schools in Clifton, VA. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking.
What other schools are in Fairfax County Public Schools?
Besides Union Mill Elementary, Fairfax County Public Schools also operates Lake Braddock Secondary (4,411 students), Robinson Secondary (3,710 students), and Hayfield Secondary (3,256 students). See the Fairfax County Public Schools district page for the complete list.