Mastery CS John Wister Elementary

Mastery CS John Wister Elementary operates as a moderately sized K-5 school in Philadelphia, Pennsylvania, one of the schools within Mastery CS John Wister Elementary. Current enrollment sits at 506 students spanning grades K through 5.

Mastery CS John Wister Elementary sits inside Mastery CS John Wister Elementary, the local public-school operator responsible for the campus.

Looking at the student body, Mastery CS John Wister Elementary reports that nearly all students (89%) are Black. Beyond that, the school shows 6% Hispanic, 4% multiracial. By comparison, Philadelphia County as a whole is about 39% Black, so the school skews noticeably more Black than its surroundings.

In terms of school funding signals, Mastery CS John Wister Elementary logs 30 full-time-equivalent teachers, putting the student-to-teacher ratio at about 16.9:1. Statewide, the average ratio sits near 13.1:1, putting Mastery CS John Wister Elementary higher than the state norm the norm. An estimated 98% of students are eligible for free or reduced-price lunch, often used as a Title I proxy.

Adjusting for the school's free-and-reduced-lunch share, Mastery CS John Wister Elementary performs roughly as the BeatsExpectations model predicts for a school with this FRL share. The predicted value is around 35.4%, the actual is 25.0%, a residual of -10.4 points.

In the area at large, census data for Philadelphia County shows median household income runs about $61,953, roughly 35% of adults have completed at least a four-year degree, and census figures put the poverty rate at about 17%. In all, Philadelphia County runs 309 public schools (combined enrollment of about 182,005 students), of which Mastery CS John Wister Elementary is one.

Nearest neighbor: Fitler Academics Plus, around 0.5 miles off. Within five miles, there are 8 other public schools. On composite proficiency, Mastery CS John Wister Elementary comes 3rd of 7 in the immediate cluster, below the nearby-schools average of 33.7%.

Mastery CS John Wister Elementary operates from an inner-city location. As a public charter, Mastery CS John Wister Elementary runs on public funding but with greater curricular and operational autonomy than a typical district school.

Trend over the last 7 years. Over the past 7-year window, the student count changed only slightly: 504 students in 2018 compared to 506 in 2025.

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