The Mastery Charter School Mann Elementary, formerly known as the William B. Mann School, is an historic, American school that is located in the Wynnefield neighborhood of Philadelphia, Pennsylvania. It is a charter school run by Mastery Charter Schools.
Serving 573 students in grades Kindergarten-6, Mastery Cs - Mann Campus 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 7% (which is lower than the Pennsylvania state average of 38%). The percentage of students achieving proficiency in reading/language arts is 18% (which is lower than the Pennsylvania state average of 55%).
The student-teacher ratio of 15:1 is higher than the Pennsylvania state level of 13:1.
Minority enrollment is 99% of the student body (majority Black), which is higher than the Pennsylvania state average of 40% (majority Hispanic and Black).
Quick Facts (2026)
- School Type: Charter School
- Grades: Kindergarten-6
- Enrollment: 573 students
- Student-Teacher Ratio: 15:1
- Minority Enrollment: 99%
- Overall Testing Rank: Bottom 50% in PA
- Math Proficiency: 7% (Btm 50%)
- Reading Proficiency: 18% (Btm 50%)
- Science Proficiency: 40-44% (Btm 50%)
- Source: National Center for Education Statistics (NCES), PA Dept. of Education
School Overview
Mastery Cs - Mann Campus's student population of 573 students has stayed relatively flat over five school years.
The teacher population of 37 teachers has grown by 8% over five school years.
School Type
Grades Offered
Grades Kindergarten-6
(No virtual instruction)
(No virtual instruction)
Total Students
573 students
Total Classroom Teachers
37 teachers
Year Founded
2001
School Calendar
Last Day of School
Tue. Jun 30, 2026
Average Class Size
15 students
School Rankings
Mastery Cs - Mann Campus 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 Mastery Cs - Mann Campus is 0.25, which is less 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
#2615 out of 2733 schools
(Bottom 50%)
(Bottom 50%)
Math Test Scores (% Proficient)
7%
38%
Reading/Language Arts Test Scores (% Proficient)
18%
55%
Science Test Scores (% Proficient)
40-44%
57%
Student-Teacher Ratio
15:1
13:1
American Indian
n/a
n/a
Asian
n/a
5%
Hispanic
7%
16%
Black
86%
14%
White
1%
60%
Hawaiian
n/a
n/a
Two or more races
6%
5%
All Ethnic Groups
Eligible for Free Lunch
98%
59%
Eligible for Reduced Lunch (12-13)
9%
5%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), PA Dept. of Education
Frequently Asked Questions
What is Mastery Cs - Mann Campus's ranking?
Mastery Cs - Mann Campus is ranked #2615 out of 2,733 schools, which ranks it among the bottom 50% of public schools in Pennsylvania.
What schools are Mastery Cs - Mann Campus often compared to?
Mastery Cs - Mann Campusis often viewed alongside schools like Inquiry Charter School, Ad Prima Charter School by visitors of our site.
What percent of students have achieved state testing proficiency in math and reading?
7% of students have achieved math proficiency (compared to the 38% PA state average), while 18% of students have achieved reading proficiency (compared to the 55% PA state average).
How many students attend Mastery Cs - Mann Campus?
573 students attend Mastery Cs - Mann Campus.
What is the racial composition of the student body?
86% of Mastery Cs - Mann Campus students are Black, 7% of students are Hispanic, 6% of students are Two or more races, and 1% of students are White.
What is the student-teacher ratio of Mastery Cs - Mann Campus?
Mastery Cs - Mann Campus has a student ration of 15:1, which is higher than the Pennsylvania state average of 13:1.
What grades does Mastery Cs - Mann Campus offer ?
Mastery Cs - Mann Campus offers enrollment in grades Kindergarten-6 (No virtual instruction).
What school district is Mastery Cs - Mann Campus part of?
Mastery Cs - Mann Campus is part of Mastery CS-Mann Campus School District.
In what neighborhood is Mastery Cs - Mann Campus located?
Mastery Cs - Mann Campus is located in the Wynnefield neighborhood of Philadelphia, PA.
School Reviews
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