Serving 874 students in grades Prekindergarten-6, Union Mill Elementary School ranks in the top 30% of all schools in Virginia for overall test scores (math proficiency is top 20%, and reading proficiency is top 20%).
The percentage of students achieving proficiency in math is 84% (which is higher than the Virginia state average of 68%). The percentage of students achieving proficiency in reading/language arts is 76% (which is higher than the Virginia state average of 69%).
The student-teacher ratio of 16:1 is higher than the Virginia state level of 14:1.
Minority enrollment is 41% of the student body (majority Asian and Hispanic), which is lower than the Virginia state average of 56% (majority Black and Hispanic).
Quick Facts (2026)
- Grades: Prekindergarten-6
- Enrollment: 874 students
- Student-Teacher Ratio: 16:1
- Minority Enrollment: 41%
- Overall Testing Rank: Top 30% in VA
- Math Proficiency: 84% (Top 20%)
- Reading Proficiency: 76% (Top 50%)
- Science Proficiency: 70-74% (Top 20%)
- Source: National Center for Education Statistics (NCES), VA Dept. of Education
Top Rankings
Union Mill Elementary School ranks among the top 20% of public schools in Virginia for:
Category
Attribute
Math Proficiency
Science Proficiency
School Overview
Union Mill Elementary School's student population of 874 students has stayed relatively flat over five school years.
The teacher population of 55 teachers has declined by 5% over five school years.
Grades Offered
Grades Prekindergarten-6
(Supplemental Virtual)
(Supplemental Virtual)
Total Students
874 students
Total Classroom Teachers
55 teachers
School Calendar
Last Day of School
Thu. Jun 11, 2026
School Rankings
Union Mill Elementary School ranks within the top 30% of all 1,773 schools in Virginia (based off of combined math and reading proficiency testing data).
The diversity score of Union Mill Elementary School is 0.61, which is less than the diversity score at state average of 0.72. The school's diversity has stayed relatively flat over five school years.
Overall Testing Rank
#406 out of 1773 schools
(Top 30%)
(Top 30%)
Math Test Scores (% Proficient)
84%
68%
Reading/Language Arts Test Scores (% Proficient)
(20-21)76%
69%
Science Test Scores (% Proficient)
(20-21)70-74%
59%
Student-Teacher Ratio
16:1
14:1
American Indian
n/a
n/a
Asian
16%
8%
Hispanic
11%
20%
Black
5%
21%
White
59%
44%
Hawaiian
n/a
n/a
Two or more races
9%
7%
All Ethnic Groups
Eligible for Free Lunch
10%
57%
Eligible for Reduced Lunch
2%
2%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), VA Dept. of Education
Frequently Asked Questions
What is Union Mill Elementary School's ranking?
Union Mill Elementary School is ranked #406 out of 1,773 schools, which ranks it among the top 30% of public schools in Virginia.
What schools are Union Mill Elementary School often compared to?
Union Mill Elementary Schoolis often viewed alongside schools like Centreville Elementary School, Centre Ridge Elementary School by visitors of our site.
What percent of students have achieved state testing proficiency in math and reading?
84% of students have achieved math proficiency (compared to the 68% VA state average), while 76% of students have achieved reading proficiency (compared to the 69% VA state average).
How many students attend Union Mill Elementary School?
874 students attend Union Mill Elementary School.
What is the racial composition of the student body?
59% of Union Mill Elementary School students are White, 16% of students are Asian, 11% of students are Hispanic, 9% of students are Two or more races, and 5% of students are Black.
What is the student-teacher ratio of Union Mill Elementary School?
Union Mill Elementary School has a student ration of 16:1, which is higher than the Virginia state average of 14:1.
What grades does Union Mill Elementary School offer ?
Union Mill Elementary School offers enrollment in grades Prekindergarten-6 (Supplemental Virtual).
What school district is Union Mill Elementary School part of?
Union Mill Elementary School is part of Fairfax County School District.
School Reviews
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