Joseph Arthur Middle School

Joseph Arthur Middle School is a middle school of compact scale in O Fallon, Illinois, operated by Central SD 104, hosting 299 students in grades 4 through 8. That puts it 35% leaner than the typical public school in Illinois, which averages around 462 students.

Central SD 104 comprises 2 schools with combined enrollment of 629 students; Joseph Arthur Middle School is among them.

Looking at the student body, Joseph Arthur Middle School lists that the most-represented group is White (38%), with the rest of the student body spread across multiple groups. Other groups include 35% Black, 10% Hispanic, 9% multiracial, 5% Asian. That is meaningfully less White than the county at large, where the share is closer to 60%.

In terms of school funding signals, On paper, Joseph Arthur Middle School has 25 full-time-equivalent teachers, translating to a class-load average of around 12.2:1. The state averages around 13.0:1, so this campus is tighter than the state norm typical.

In the broader community, census data for St. Clair County shows median household income runs about $73,854, 32% of adults hold a bachelor's degree or higher, and census figures put the poverty rate at about 10%. Across St. Clair County's 96 public schools (combined enrollment of about 40,879 students), Joseph Arthur Middle School is one campus in the mix.

Dawn Elser Elementary School is the nearest neighboring public school, about 0.3 miles from this campus. Counting just inside five miles, 8 other public schools cluster around Joseph Arthur Middle School.

The school occupies a suburban site.

Trend over the last 7 years. Over the past 7-year window, the student count ticked up 29%: 231 students in 2018 compared to 299 in 2025. The Black share of enrollment declined from 41% to 35% over that span.

On allk12, posts here usually surface around open house dates, ride-share offers, and field-trip permission slips. Posting is open to anyone connected to the school.