Monticello High School

Monticello High School is one of the close-knit secondary schools in Monticello, Illinois, part of Monticello CUSD 25, with 489 students on its rolls from grades 9 through 12. Compared to the state average of about 834 students per school, that is 41% below typical.

Across the 4 schools in Monticello CUSD 25 (1,707 students total), Monticello High School accounts for its share of the district's footprint.

On the student-mix side, Monticello High School lists that nearly all students (90%) are White. Other groups include 3% Black, 3% multiracial, 2% Hispanic.

In terms of school funding signals, The school employs 36 full-time-equivalent teachers, for a student-teacher ratio near 13.6:1. The state averages about 13.8:1, putting this campus right in line with peers.

In the area at large, community-level numbers for Piatt County indicate median household earnings sit near $94,811, roughly 33% of adults have completed at least a four-year degree, and roughly 5% of residents live below the federal poverty line. Monticello High School is one of 14 public schools in Piatt County (combined enrollment of about 3,086 students).

Nearest neighbor: Washington School, around 0.1 miles off. Within five miles, there are 2 other public schools.

Geographically, the school is in a small-town area.

Looking at the recent track record. Over the past 7-year window, the student count decreased 7%: 527 students in 2018 compared to 489 in 2025. The White share of enrollment shrank from 97% to 90% over that span. The student-to-teacher ratio fell from 14.6:1 in 2018 to 13.6:1 today.

On allk12, the page collects discussion, questions, and updates around classroom updates, athletics, and weather closures. Members of the school community can share what they know.