The top reported proficiency rate is 62% in Science. The lowest is 19% in Math.
Original Research by School Decision on Sangamon Valley Middle School
Sangamon Valley Middle School serves grades six through eight in Illiopolis, a small rural village in Sangamon County positioned between Springfield and Decatur. The school sits on Matilda Street, where it shares a campus with the intermediate building serving grades three through five. The district itself is geographically distributed across three towns: the primary school is in Harristown, the middle and intermediate schools are in Illiopolis, and the high school is in Niantic.
The enrollment at this point is small, with roughly a hundred students across the three grades. The student body is predominantly white, with a very small number of students from other racial and ethnic backgrounds. Data on free-or-reduced-price lunch eligibility and on special education and English learner populations were not available.
Academic performance, based on state testing results that became available recently, shows a mixed and grade-dependent pattern. In English language arts, eighth graders performed substantially above the midpoint, but sixth graders were below it and seventh graders performed near the middle. In mathematics, proficiency rates were low across all three grades tested, with eighth grade at roughly one in ten, sixth grade at one in five, and seventh grade just under one in four. Science testing was conducted only in eighth grade, where about three in five students met the proficiency threshold. The school's overall proficiency rate across tested subjects and grades places it in the bottom quartile when measured against other districts in Sangamon County.
The testing environment itself has shifted recently; Illinois changed its proficiency benchmarks for these assessments, so some year-to-year comparisons are complicated. All students tested participated in the assessments at the rates reported.
The school serves a community experiencing slow economic contraction. Illiopolis was historically anchored by agricultural employment and then by industrial facilities including a World War II-era ordnance plant and, more recently, a large PVC chemical plant operated by Formosa Plastics. That plant closed a decade ago and was demolished several years back, removing the town's largest employer. Current economic development efforts center on marketing existing infrastructure and building inventory rather than new growth. Housing values in the 62539 zip code are substantially below both the Illinois and national averages, reflecting the small-town and economically stressed character of the area. The Sangamon Valley school district itself is implementing a property-tax levy increase for 2025 that will be felt directly on resident property tax bills.
Program-specific course offerings and staffing details were not included in the available data. Similarly, information on student attendance, discipline, or other school-environment factors was not provided. A parent considering this school may want to contact the district directly about available courses, extracurricular activities, and support services for students who may need extra help in mathematics, where proficiency gaps are evident.
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