Southbury Elem School

Southbury Elem School, an expansive elementary-level community in Oswego, Illinois, overseen by CUSD 308, instructs 676 students, covering grades K through 5. Enrollment runs roughly 77% above the state mean of about 381.

Within CUSD 308, which oversees 21 schools and 16,766 students, Southbury Elem School is one campus in the system.

On demographics, Southbury Elem School shows that the largest single group is White at 53%, but no single group is in the majority. The remainder comes out to 16% Hispanic, 14% Asian, 11% Black, 6% multiracial. That is meaningfully less White than the county at large, where the share is closer to 65%.

In terms of school funding signals, The school reports having 43 full-time-equivalent teachers, for a student-teacher ratio near 15.9:1. The state averages around 13.9:1, so this campus is higher than the state norm typical. Around 26% of the student body qualifies for free or reduced-price meals, which schools and policymakers use as a rough income-mix signal.

On a demographically-adjusted basis, Southbury Elem School tracks the demographic baseline. The model predicts 56.7% given the school's FRL share; actual proficiency is 53.6%.

In the area at large, the surrounding county (Kendall County) logs that median household earnings sit near $111,601, about 37% of the adult population holds a bachelor's degree or above, and census figures put the poverty rate at about 5%. In all, Kendall County runs 50 public schools (combined enrollment of about 29,773 students), of which Southbury Elem School is one.

The closest other public school is Traughber Jr High School, roughly 0.8 miles away. Within five miles, there are 8 other public schools. Among the 8 schools in that immediate cluster with test data (this one included), Southbury Elem School ranks 3rd on composite proficiency, higher than the local average of 48.1%.

Southbury Elem School operates from a residential location.

Five-year trend. Southbury Elem School's enrollment has rose 17% since 2018, when it stood at 579 (now 676). White enrollment moved from 66% to 53% across the same window. Class-load math has widened: from 14.4:1 in 2018 to 15.9:1 in 2025.

On this page, recent activity here tends to focus on sports schedules, lunch menu changes, and school spirit week. Posting is open to anyone connected to the school.