Upper Darby High School is a four-year public high school located in Upper Darby Township in Delaware County, Pennsylvania. It is part of the Upper Darby School District. Established in 1895, it is the oldest high school in Delaware County.
Serving 4,187 students in grades 9-12, Upper Darby Sr. High School ranks in the bottom 50% of all schools in Pennsylvania for overall test scores (math proficiency is bottom 50%, and reading proficiency is bottom 50%).
The percentage of students achieving proficiency in math is 10% (which is lower than the Pennsylvania state average of 38%). The percentage of students achieving proficiency in reading/language arts is 50% (which is lower than the Pennsylvania state average of 55%).
The student-teacher ratio of 17:1 is higher than the Pennsylvania state level of 13:1.
Minority enrollment is 85% of the student body (majority Black), which is higher than the Pennsylvania state average of 40% (majority Hispanic and Black).
Quick Facts (2026)
- Grades: 9-12
- Enrollment: 4,187 students
- Student-Teacher Ratio: 17:1
- Minority Enrollment: 85%
- Graduation Rate: 89% (Btm 50% in PA)
- Overall Testing Rank: Bottom 50%
- Math Proficiency: 10% (Btm 50%)
- Reading Proficiency: 50% (Btm 50%)
- Science Proficiency: 39% (Btm 50%)
- Source: National Center for Education Statistics (NCES), PA Dept. of Education
Top Rankings
Upper Darby Sr. High School ranks among the top 20% of public schools in Pennsylvania for:
Category
Attribute
Diversity
Percent Eligible For Free Lunch
School Overview
Upper Darby Sr. High School's student population of 4,187 students has grown by 8% over five school years.
The teacher population of 246 teachers has stayed relatively flat over five school years.
Grades Offered
Grades 9-12
(Supplemental Virtual)
(Supplemental Virtual)
Total Students
4,187 students
Total Classroom Teachers
246 teachers
Year Founded
1895
Colors
Purple, Gold
School Rankings
Upper Darby Sr. High School ranks within the bottom 50% of all 2,733 schools in Pennsylvania (based off of combined math and reading proficiency testing data).
The diversity score of Upper Darby Sr. High School is 0.67, which is more than the diversity score at state average of 0.60. The school's diversity has stayed relatively flat over five school years.
Overall Testing Rank
#2191 out of 2733 schools
(Bottom 50%)
(Bottom 50%)
Math Test Scores (% Proficient)
10%
38%
Reading/Language Arts Test Scores (% Proficient)
50%
55%
Science Test Scores (% Proficient)
39%
57%
Student-Teacher Ratio
17:1
13:1
American Indian
n/a
n/a
Asian
14%
5%
Hispanic
17%
16%
Black
51%
14%
White
15%
60%
Hawaiian
n/a
n/a
Two or more races
3%
5%
All Ethnic Groups
Graduation Rate
89%
87%
Eligible for Free Lunch
100%
59%
Eligible for Reduced Lunch (17-18)
4%
3%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), PA Dept. of Education
Frequently Asked Questions
What is Upper Darby Sr. High School's ranking?
Upper Darby Sr. High School is ranked #2191 out of 2,733 schools, which ranks it among the bottom 50% of public schools in Pennsylvania.
What percent of students have achieved state testing proficiency in math and reading?
10% of students have achieved math proficiency (compared to the 38% PA state average), while 50% of students have achieved reading proficiency (compared to the 55% PA state average).
What is the graduation rate of Upper Darby Sr. High School?
The graduation rate of Upper Darby Sr. High School is 89%, which is higher than the Pennsylvania state average of 87%.
How many students attend Upper Darby Sr. High School?
4,187 students attend Upper Darby Sr. High School.
What is the racial composition of the student body?
51% of Upper Darby Sr. High School students are Black, 17% of students are Hispanic, 15% of students are White, 14% of students are Asian, and 3% of students are Two or more races.
What is the student-teacher ratio of Upper Darby Sr. High School?
Upper Darby Sr. High School has a student ration of 17:1, which is higher than the Pennsylvania state average of 13:1.
What grades does Upper Darby Sr. High School offer ?
Upper Darby Sr. High School offers enrollment in grades 9-12 (Supplemental Virtual).
What school district is Upper Darby Sr. High School part of?
Upper Darby Sr. High School is part of Upper Darby School District.
School Reviews
5 10/10/2025
A great place to prepare for life.
5 10/10/2025
Absolutely amazing place to prepare you for the real world. From academics to extracurriculars Upper Darby does not get enough credit.
Review Upper Darby Sr. High School. Reviews should be a few sentences in length. Please include any comments on:
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