Enrollment
2,540
Illinois · 2024-25 NCES data
2024-25 NCES data High school (grades 9-12) NCES 172979003090
O Fallon High School — O Fallon, IL
Federal NCES profile for O Fallon High School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators — composite Resource Quality Score 42/100.
School address
District: O Fallon Twp Hsd 203 · Illinois
Public location data per NCES (National Center for Education Statistics) Common Core of Data. Verify the school's current address on the NCES CCD record.
Teachers (FTE)
149.0
Federal CCD staff survey
Students per teacher
16.9:1
vs 14.6:1 Illinois avg
+16% vs state
Student-teacher ratio in context
How O Fallon High School compares with Illinois and U.S. medians
What this school's NCES data tells you
O Fallon High School reports 2,540 enrolled students to the National Center for Education Statistics (NCES) alongside 149.0 full-time-equivalent teachers, producing a 16.9:1 student-teacher ratio. That figure sits 16% above the Illinois state mean of 14.6:1, signalling larger average class loads than peers in the same state. Against the national 2024-25 average of 15.9:1, it is 6% higher, a useful calibration for families comparing districts across state lines.
The school offers 13 Advanced Placement courses, a stronger academic pipeline indicator than enrollment alone. Counselor coverage works out to roughly 363 students per counselor, above the ASCA-recommended ceiling of 250:1. Chronic absenteeism — missing 10% or more of school days — stands at 17.6% according to the 2021-22 Civil Rights Data Collection.
On the finance side, the surrounding O Fallon Twp Hsd 203 spends $16,038 per pupil district-wide, below the Illinois average of $20,099 and below the national average of $19,490. Revenue comes 56.2% from local sources (property taxes), 37.9% from the state, and 5.9% from federal programs per the NCES F-33 finance survey. Taken together, these measurements produce a composite Resource Quality Grade of D (42/100), calculated from 5 distinct NCES and CRDC indicators.
Source: National Center for Education Statistics Common Core of Data + CRDC + F-33 · 2024-25
How O Fallon High School compares
Cross-validating school-level NCES values against Illinois state and U.S. national means lets readers see whether this school is an outlier or in line with peers.
| Metric | This school | Illinois avg | U.S. avg |
|---|---|---|---|
| Students per teacher | 16.9:1 | 14.6:1 | 15.9:1 |
| Enrollment (students) | 2,540 | — | — |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
Overview
Enrollment 2,540
Teachers (FTE) 149.0
Students per teacher 16.9:1 +16% vs state
Free-lunch eligible —
NCES ID 172979003090
Student demographics
White 59.3%
African American 20.5%
Two or More 9.5%
Hispanic or Latino 8.1%
Asian 2.5%
American Indian / Alaska Native 0.1%
Largest group: White at 59.3% of enrollment.
Programs & staff
AP courses offered 13
Counselors (FTE) 7.0
Students per counselor 363:1
Discipline & special education
Chronically absent 17.6%
In-school suspensions 271
Out-of-school suspensions 165
Expulsions 10
Funding & spending
District-wide per-pupil expenditure for O Fallon Twp Hsd 203, which includes O Fallon High School.
$16,038
Per student
-20%
vs Illinois
Avg $20,099
-18%
vs U.S.
Avg $19,490
Revenue mix
Local 56.2%
State 37.9%
Federal 5.9%
Source: NCES F-33 School District Finance Survey District-level finance · FY 2021-22 Per-pupil expenditure reflects the district-wide average. Individual school budgets are not reported at the federal level.
Educator & family resources
In-depth guides on understanding NCES data, school choice, and education funding.
Understanding NCES data
How CCD, CRDC and EDFacts feed every public-school number you see.
Choose a school district
Eight signals that matter more than the overall ranking number.
How schools are funded
Title I, F-33, state aid formulas and what per-pupil spending really means.
Chronic absenteeism
Why missing 10% of school matters and how it varies by district.
Magnet vs charter vs traditional
Three school types, three funding models, three sets of trade-offs.
School discipline data
What CRDC suspension and expulsion records do and don't reveal.
Frequently asked questions about O Fallon High School
How many students attend O Fallon High School?
O Fallon High School has 2,540 students enrolled. It is a high school in O Fallon, IL.
What is the student-teacher ratio at O Fallon High School?
The student-teacher ratio at O Fallon High School is 16.9:1, which is 16% higher than the Illinois average of 14.6:1 and 6% higher than the national average of 15.9:1.
What is the racial and ethnic makeup of O Fallon High School?
The largest demographic group at O Fallon High School is White at 59.3%. The school serves a diverse student body in O Fallon, IL.
What is the quality grade for O Fallon High School?
O Fallon High School receives a Resource Quality Grade of D (42/100) based on 5 factors: student-teacher ratio, AP course offerings, counselor availability, attendance rates. This grade reflects available federal resource indicators, not standardized test scores.
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