McClellan Elementary School
Test scores
IAR + ISA 2024-25 . % Proficient (Levels 4-5)What this means: On the IAR + ISA, Illinois's statewide test, about 41 of every 100 students at this school read and write at grade level and about 19 of 100 do math at grade level. Across all Illinois schools, those numbers are about 51 and 38. Reading and writing scores are up about 23 points since 2023, while math scores are down about 5 points.
BeatsExpectations
Demographically-adjusted score · methodologyWhat this means: About 24% of students here test proficient in math and reading, below the roughly 46% typical for Illinois schools with a similar share of low-income students. BeatsExpectations compares each school with others at the same poverty level, not by raw scores, so a school lands here when its results trail those comparable schools, which is not the same as having low scores. A higher-scoring school can still fall in this tier if similar schools score higher still.
7-year change
SY 2017-18 vs SY 2024-25About McClellan Elementary School
Located at 9475 N IL Highway 148, in Mount Vernon, Illinois, McClellan Elementary School is a minimally staffed primary school that hosts 56 students (grades K through 8), operated by McClellan CCSD 12. Compared to the state average of about 381 students per school, that is 85% below typical.
McClellan Elementary School sits inside McClellan CCSD 12, the local public-school operator responsible for the campus.
In terms of who attends, McClellan Elementary School logs that the student body is overwhelmingly White (98%). The wider county runs roughly 84% White, putting the school's mix meaningfully more White than the area baseline.
In terms of school funding signals, The school reports having 7 full-time-equivalent teachers, for a student-teacher ratio near 8.4:1. The state averages around 13.9:1, so this campus is tighter than the state norm typical. About 45% of enrolled students meet the income threshold for free or reduced-price lunch, a commonly cited indicator of low-income enrollment. That share is lower than Jefferson County's rate of about 60%.
After controlling for student poverty, McClellan Elementary School falls in the UNDERPERFORMING tier of the BeatsExpectations residual. Given its student profile, a typical campus would land near 45.7%; this one comes in at 23.8%, -22.0 points off the demographic line.
Zooming out to the county, ACS estimates for Jefferson County put median household income runs about $63,118, about 18% of the adult population holds a bachelor's degree or above, and census figures put the poverty rate at about 11%. In all, Jefferson County runs 31 public schools (combined enrollment of about 5,314 students), of which McClellan Elementary School is one.
Mount Vernon High School is the nearest neighboring public school, about 1.7 miles from this campus. Counting just inside five miles, 7 other public schools cluster around McClellan Elementary School. On composite proficiency, McClellan Elementary School comes 6th of 8 in the immediate cluster, beneath the nearby-schools average of 32.8%.
McClellan Elementary School operates from a small-town location.
Looking at the recent track record. McClellan Elementary School's enrollment has remained close to its prior level since 2018, when it stood at 56 (now 56).
Within the allk12 community for this school, recent activity here tends to focus on pickup logistics, teacher feedback, and after-school programs. Parents, students, alumni, and staff are welcome to weigh in.
Jefferson County at a glance
View full county profileQuick facts
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