Olathe South Sr High

Olathe South Sr High is a high-enrollment four-year high school in Olathe, Kansas, part of Olathe. The school hosts 1,778 students in grades 9 through 12. Compared to the state average of about 410 students per school, that is 334% above typical.

Olathe South Sr High is one of 52 schools operated by Olathe, a district that serves 28,194 students overall.

For racial and ethnic makeup, Olathe South Sr High logs that 69% of the student body identifies as White. The remainder breaks down as 15% Hispanic, 8% Black, 4% Asian, 4% multiracial. By comparison, Johnson County as a whole is about 79% White, so the school skews considerably less White than its surroundings.

In terms of school funding signals, On paper, Olathe South Sr High has 117 full-time-equivalent teachers, translating to a class-load average of around 15.1:1. Statewide, the average ratio sits near 11.9:1, putting Olathe South Sr High higher than the state norm the norm. An estimated 21% of students are eligible for free or reduced-price lunch, a number frequently used as a low-income enrollment indicator.

On a residual basis (actual vs predicted given the student mix), On a poverty-adjusted basis, Olathe South Sr High sits in the bottom 10% statewide. Predicted proficiency from the FRL regression is roughly 51.9%; actual is 34.1%, a gap of -17.9 points.

In the area at large, ACS estimates for Johnson County put median household earnings sit near $109,208, 58% of adults hold a bachelor's degree or higher, and census figures put the poverty rate at about 3%. Olathe South Sr High is one of 168 public schools in Johnson County (combined enrollment of about 93,598 students).

The closest other public school is Indian Trail Middle School, roughly 0.2 miles away. Counting just inside five miles, 8 other public schools cluster around Olathe South Sr High. Ranking that nearby cluster on reported proficiency puts Olathe South Sr High at 8th of 9; the average score across the group is 48.8%.

Geographically, the school is in an outer-ring area.

Looking at the recent track record. Looking back 7 years, enrollment at Olathe South Sr High has fell 15%, going from 2,089 students in 2018 to 1,778 in 2025. The White share of enrollment fell from 74% to 69% over that span. The student-to-teacher ratio fell from 17.5:1 in 2018 to 15.1:1 today.

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