St Teresa High School
Decatur · IL · Catholic religious-affiliated · K-12 combined
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How St Teresa High School compares for families
What families should know about St Teresa High School.
- ▸ LocallyIL sits right at the US average on NAEP 8th-grade math — local school quality will set your kid apart.
- ▸ vs Similar SchoolsThe closest comparables nearby: Lutheran School Association, Decatur Christian School, Arthur Christian School and 5 more. See the sidebar to compare side-by-side.
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Your state's public flagship
University of Illinois Urbana-Champaign
The in-state tuition gap is the flagship's biggest draw — most in-state families pay far less than the out-of-state sticker. Average net price after aid runs about $14,355/yr. Admission odds depend on your student's GPA and test scores, not which high school they attend.
Source: IPEDS admissions, tuition & enrollment + College Scorecard net price. Flagship = the state's primary public research university.
Enrollment trend & projection
Private school enrollment comes from the NCES Private School Universe Survey (PSS), which is collected every other year — not annually like public-school data. The most recent published collection is 2021–22; NCES targeted spring 2026 for the 2023–24 release — we'll load it as soon as it's published.
Most similar nearby high schools
The schools most like this one — same type, blended on distance and size — and where their enrollment is heading. These are the schools families here weigh against each other.
| School | Type | Miles | HS enrollment | Trend |
|---|---|---|---|---|
| Lutheran School Association Decatur |
Private | 1.7 | 322 | -12.5% |
| Decatur Christian School Forsyth |
Private | 4.2 | 159 | +26.2% |
| Arthur Christian School Arthur |
Private | 26.4 | 173 | — |
| Sacred Heart Griffin High School Springfield |
Private | 38.5 | 510 | -20.9% |
| The High School Of Saint Thomas More Champaign |
Private | 40.9 | 211 | -21.6% |
| Central Catholic High School Bloomington |
Private | 42.8 | 295 | -10.3% |
| St Anthony High School Effingham |
Private | 56.0 | 200 | -9.1% |
| Routt Catholic High School Jacksonville |
Private | 68.0 | 124 | -3.1% |
At a glance
JSON · Using this page with an AI assistantSt Teresa High School is a private high school in Decatur, IL, enrolling 275 students in grades 9-12 in 2022.
Enrollment is up 21% from 2020 to 2022.
Sources: National Center for Education Statistics (enrollment), the federal Civil Rights Data Collection and EDFacts, state education agencies where named, and the school's own published documents where named.
Questions families ask
How many students attend St Teresa High School? St Teresa High School is a private high school in Decatur, IL, enrolling 275 students in grades 9-12 in 2022.
Analysis: Test Prep Gurus (High School Reach, highschoolreach.com). These figures may be quoted with attribution to Test Prep Gurus.
What does AI tell parents about St Teresa High School?
When a parent asks an AI assistant about St Teresa High School, the answer is built from a handful of sources, and Reach is often one of them. We will send the admissions office a short report on what AI says about St Teresa High School and where it comes from. The first report is free.
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Related reading
AP courses · October 2026
Test scores · October 2026