Serving 228 students in grades Prekindergarten-5, Costello School ranks in the bottom 50% of all schools in Illinois for overall test scores (math proficiency is bottom 50%, and reading proficiency is bottom 50%).
The percentage of students achieving proficiency in math is 10-14% (which is lower than the Illinois state average of 27%). The percentage of students achieving proficiency in reading/language arts is 30-34% (which is approximately equal to the Illinois state average of 30%).
The student-teacher ratio of 8:1 is lower than the Illinois state level of 13:1.
Minority enrollment is 91% of the student body (majority Hispanic), which is higher than the Illinois state average of 55% (majority Hispanic).
Quick Facts (2026-27)
- Grades: Prekindergarten-5
- Enrollment: 228 students
- Student-Teacher Ratio: 8:1
- Minority Enrollment: 91%
- Overall Testing Rank: Bottom 50% in IL
- Math Proficiency: 10-14% (Btm 50%)
- Reading Proficiency: 30-34% (Top 50%)
- Science Proficiency: 40-49% (Btm 50%)
- Attendance Zone: Costello School serves a central area within Lyons, IL, covering approximately 1.9 square miles. Most students live within a 5-10 minute drive, with the furthest edge of the zone being about 1.3 miles from the school.
- Source: National Center for Education Statistics (NCES), IL Dept. of Education
School Overview
Costello School's student population of 228 students has declined by 13% over five school years.
The teacher population of 27 teachers has stayed relatively flat over five school years.
Grades Offered
Grades Prekindergarten-5
Total Students
228 students
Total Classroom Teachers
27 teachers
School Calendar
School Rankings
Costello School ranks within the bottom 50% of all 3,542 schools in Illinois (based off of combined math and reading proficiency testing data).
The diversity score of Costello School is 0.29, which is less than the diversity score at state average of 0.70. The school's diversity has stayed relatively flat over five school years.
Overall Testing Rank
#1909 out of 3542 schools
(Bottom 50%)
(Bottom 50%)
Math Test Scores (% Proficient)
10-14%
27%
Reading/Language Arts Test Scores (% Proficient)
30-34%
30%
Science Test Scores (% Proficient)
40-49%
50%
Student-Teacher Ratio
8:1
13:1
American Indian
n/a
n/a
Asian
2%
6%
Hispanic
84%
29%
Black
3%
16%
White
9%
45%
Hawaiian
n/a
n/a
Two or more races
2%
4%
All Ethnic Groups
Chronically Absent Students
(22-23)48.3%
29.7%
Eligible for Free Lunch
76%
43%
Eligible for Reduced Lunch
14%
4%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), IL Dept. of Education
Frequently Asked Questions
What is Costello School's ranking?
Costello School is ranked #1909 out of 3,542 schools, which ranks it among the bottom 50% of public schools in Illinois.
What percent of students have achieved state testing proficiency in math and reading?
10-14% of students have achieved math proficiency (compared to the 27% IL state average), while 30-34% of students have achieved reading proficiency (compared to the 30% IL state average).
How many students attend Costello School?
228 students attend Costello School.
What is the racial composition of the student body?
84% of Costello School students are Hispanic, 9% of students are White, 3% of students are Black, 2% of students are Asian, and 2% of students are Two or more races.
What is the student-teacher ratio of Costello School?
Costello School has a student ration of 8:1, which is lower than the Illinois state average of 13:1.
What grades does Costello School offer ?
Costello School offers enrollment in grades Prekindergarten-5
What school district is Costello School part of?
Costello School is part of Lyons SD 103 School District.
School Reviews
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