Twin Chimneys Elem.
O'fallon, MO · Elementary School
Twin Chimneys Elem. is a elementary school in O'fallon, MO with 537 students enrolled and a 68% proficiency rate. Part of Ft. Zumwalt R-II. NCES data from the U.S. Department of Education.
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About This School
Twin Chimneys Elem. is a elementary school located in O'fallon, Missouri. The school serves 537 students. The student-to-teacher ratio is 12.8:1.
According to EDFacts assessment data, 68% of students meet grade-level proficiency standards in combined math and reading.
7% of students qualify for free or reduced-price lunch.
Twin Chimneys Elem. is part of the Ft. Zumwalt R-II in Missouri.
How This School Compares
Twin Chimneys Elem. has 537 students enrolled, making it smaller than the average school in Ft. Zumwalt R-II (682 students). Its 68% proficiency rate is 7 percentage points above the district average of 61%. Compared to the Missouri state average of 49%, the school performs 19 points higher. With a 12.8:1 student-teacher ratio, it offers smaller class sizes than the national average.
Frequently Asked Questions
Twin Chimneys Elem. has 537 students enrolled. The student-to-teacher ratio is 12.8:1.
According to EDFacts data, 68% of students at Twin Chimneys Elem. meet grade-level proficiency standards in combined math and reading assessments.
Twin Chimneys Elem. is part of the Ft. Zumwalt R-II in O'fallon, Missouri. You can view all schools in this district on the district page.
All data on this page comes from the National Center for Education Statistics (NCES) Common Core of Data and EDFacts assessment results. These are official federal datasets published by the U.S. Department of Education.
School profiles are built from NCES directory data and EDFacts assessment results. Proficiency rates reflect combined math and reading performance. Graduation rates are reported for high schools with available data.
this entity is one of the data points covered by this site’s U.S. K-12 school outcomes and enrollment dataset. The detail above comes directly from NCES Common Core of Data and EDFacts; the context that follows situates the headline numbers against the broader distribution across U.S. public schools and districts.
Every number on this page links back to NCES Common Core of Data and EDFacts; the methodology page describes the inputs, refresh cadence, and known limitations of the underlying data product.
For readers using this page as a decision input, the related-entity pages elsewhere on the site provide the comparison set. The most useful comparison for this entity is typically a peer within U.S. public schools and districts with similar size, similar exposure, or similar geography — not the national-level summary alone.
Source: NCES Common Core of Data, 2026.