O Fallon Twp Hsd 203, IL

Original Research by School Decision on O Fallon Twp Hsd 203

O Fallon Township High School District 203 serves students in grades nine through twelve across a two-campus model that has reshaped how the district operates and how families experience the transition into high school. Freshmen attend the Milburn Campus, while grades ten through twelve are housed at the Smiley Campus. This structure remains the defining feature of the district's organization.

The district enrolls roughly twenty-five hundred students spread fairly evenly across the four grades. The student body is predominantly white, with a substantial black student population, and meaningful representation from Hispanic and multiracial students. Asian students and other groups make up smaller shares. Racial and ethnic composition data is reported; free and reduced-price lunch counts and rates are not available in the public record, nor are figures on students with IEPs or those designated as English learners, so a parent may want to reach out to the district directly for those details.

State testing data for this district were not available. Illinois assesses students in science at grades five and eight; high schools typically face state assessments in other subject areas, but those results are not present here. Without proficiency information or graduation rate figures, readers cannot assess academic performance through those conventional markers. A parent should request the district's latest test results and four-year graduation data directly to understand how students are performing and completing their diplomas.

The two-campus design is not temporary. In 2025, the district launched a comprehensive facilities review with FGM Architects and discovered that the Smiley Campus, which dates from an earlier era, has undersized classrooms and science labs that fall short of state recommendations. General education classrooms average smaller than the state ideal, and science labs are similarly constrained. The district has put forward several options: a multistory addition at Smiley, demolition and rebuilding of Smiley except for the Panther Dome, expansion of Milburn to serve freshmen and sophomores, or expansion of Milburn to serve all grades. No bond referendum has appeared on the ballot yet, but the planning process signals that a funding question for property owners may follow, and the facilities decision will shape the district's physical footprint for years ahead.

The O Fallon area real estate market shows modest appreciation, with home values weighted across the district's service area. Most properties in the district fall in a mid-range by national standards, with O Fallon itself representing the stronger end of the local market. Rental inventory in the district is relatively tight and rents are rising. The broader St. Clair County housing market has seen increased inventory and slightly softer pricing recently, though demand remains moderate.

Among St. Clair County's districts, O Fallon's chronic absenteeism rate sits above the midpoint, meaning more students are chronically absent than the county median. Per-pupil current spending falls in the middle range but on the lower half within the county. Readers should treat these measures as context for understanding the district's position relative to its neighbors; neither metric speaks to the quality of instruction or student outcomes.

The district operates one high school, O Fallon High School, housed across the two campuses. The school maintains a website with news and updates. Families considering this district should reach out directly to request academic performance data, program offerings, course access details, and staffing information, as those specifics are not available here but are essential for understanding what O Fallon offers in the classroom and beyond.

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District Context

Officially reported figures, 2024-25.

Enrollment

2,559

Grades

09–12

Schools

Student body

Hispanic 8%

Black 22%

White 59%

Asian 3%

Two+ 9%

Am. Indian / AK Native 0%

Hawaiian / Pac. Isl. 0%

Schools in this District

1 schools are officially reported under this district.

O Fallon High School

Housing & Real Estate

Data as of April 2026 | District-weighted from constituent ZIP codes

Home Values

Typical home value$264,766

Year-over-year change+2.3%

Range across 8 ZIP codes$141K to $330K

vs. state typical0.91x

vs. national typical0.72x

Home value trend (12 months)

ZIP code home values (8 ZIP codes)

ZIP	City	Value	YoY	Weight
62269	O Fallon	$309K	+3.4%	57.4%
62254	Lebanon	$212K	-0.6%	23.8%
62232	Caseyville	$141K	-0.1%	7.4%
62221	Shiloh	$251K	+2.8%	4.4%
62234	Collinsville	$196K	+6.3%	3.1%
62208	Fairview Heights	$192K	+1.1%	2.2%
62294	Troy	$330K	+6.6%	1.7%
62226	Belleville	$184K	+5.5%	0.1%

Rental Market

Typical monthly rent$1,602/mo

Year-over-year change+3.9%

Range across 6 ZIP codes$1,135 to $1,676/mo

Rent trend (12 months)

ZIP code rents (6 ZIP codes)

ZIP	City	Rent/mo	YoY	Weight
62269	O Fallon	$1,676	+4.0%	57.4%
62221	Shiloh	$1,155	+3.9%	4.4%
62234	Collinsville	$1,135	+0.8%	3.1%
62208	Fairview Heights	$1,474	—	2.2%
62294	Troy	$1,297	—	1.7%
62226	Belleville	$1,223	+7.4%	0.1%

Affordability

Est. monthly mortgage (20% down at 6.48%)$1,336/mo

Home price / national median income3.2x

Annual rent / national median income23.0%

Rent exceeds est. mortgage by$266/mo

Market Activity: St. Clair County

Median listing price$199,950

Median listing price YoY-22.9%

Median price per sq ft$125

Median price per sq ft YoY-4.6%

Median days on market46.3 days

Median days on market YoY+18.6%

Active listings633

Active listings YoY+26.1%

New listings380

Pending listings473

Pending listings YoY+21.3%

Hotness: median listing price$214,950

Hotness: median listing price YoY-5.5%

Supply score61.4

Supply score YoY-17.6%

Demand score55.9

Demand score YoY-6.5%

Median listing price (12 months)

Median price per sq ft (12 months)

Median days on market (12 months)

Active listings (12 months)

New listings (12 months)

Pending listings (12 months)

Hotness: median listing price (12 months)

Supply score (12 months)

Demand score (12 months)

Comparison

State typical home value$290,210 (+4.9% YoY)

National typical home value$368,198 (+0.6% YoY)

State ZHVI trend (12 months)

National ZHVI trend (12 months)

Economic Context

30-year fixed mortgage rate6.48%

National unemployment rate4.3%

National median household income$83,730

CPI: Rent of shelter (index)447.05

30-year fixed mortgage rate (12 months)

National unemployment rate (12 months)

National median household income (12 months)

CPI: Rent of shelter (index) (12 months)

Sources: Zillow Home Value Index and Zillow Observed Rent Index (Zillow Group), Realtor.com via Federal Reserve Bank of St. Louis (FRED)

Data Currently Unavailable

Academic Performance
Civil Rights Data (CRDC)

This profile is derived exclusively from publicly available federal and state datasets. It may not reflect the most current information available. We encourage parents and families to supplement this data with information published directly on the school’s website, which may include more recent figures, additional programs, or updated enrollment data.