Costello School

Located at 4632 Clyde Ave, in Lyons, Illinois, Costello School is a close-knit elementary campus that educates 228 students (grades pre-K through 5), overseen by Lyons SD 103. Enrollment runs roughly 40% below the state mean of about 381.

Lyons SD 103 runs 6 schools in total, collectively educating 2,042 students. Costello School is one of those campuses.

For racial and ethnic makeup, Costello School reports that nearly all students (84%) are Hispanic; the rest is composed of 9% White, 3% Black. That is visibly more Hispanic than the county at large, where the share is closer to 27%.

Looking at school resources, Staff filings list 27 full-time-equivalent teachers, which works out to roughly 8.5:1 students per teacher. The state averages around 13.9:1, so this campus is tighter than the state norm typical. About 74% of enrolled students meet the income threshold for free or reduced-price lunch, often used as a Title I proxy.

After controlling for student poverty, Costello School sits in the middle band of the BeatsExpectations distribution. Schools with this campus's student mix typically land near 28.7%; this one delivers 33.5%.

Across the wider county, Cook County reports that median household earnings sit near $83,498, roughly 43% of adults have completed at least a four-year degree, and roughly 10% of residents live below the federal poverty line. Across Cook County's 1406 public schools (combined enrollment of about 697,934 students), Costello School is one campus in the mix.

Nearest neighbor: J W Robinson Jr Elem School, around 0.8 miles off. 8 of the 8 nearest public schools sit inside a five-mile radius. Ranking that nearby cluster on reported proficiency puts Costello School at 6th of 8; the average score across the group is 41.7%.

Geographically, the school is in an outer-ring area.

Trend over the last 7 years. Over the past 7-year window, the student count ticked down 28%: 316 students in 2018 compared to 228 in 2025. The Hispanic share of enrollment climbed from 72% to 84% over that span. The student-to-teacher ratio narrowed from 13.7:1 in 2018 to 8.5:1 today.

On this page, 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.