Enrollment
228
Elementary
DISTRICT 277 · STATE 381
SCHOOL COMMUNITY·LYONS SD 103·NCES 172385003902
Costello School
4632 Clyde Ave, Lyons, IL 60534 · (708) 783-4300 · Cook County
GRADES PK–05ELEMENTARY21-SUBURBTITLE IREGULAR SCHOOL228 STUDENTS
Student : Teacher
8.5:1
27 FTE teachers
DISTRICT 9.4:1 · STATE 13.9:1
Free / Reduced Lunch
74%
169 students
DISTRICT 77% · STATE 56%
Community
0
0 members
Enrollment and student:teacher ratio compared against other elementary schools. Free/Reduced Lunch and demographics compared against all schools.
Enrollment by grade, 2024-25
| Grade | Students | Share |
|---|---|---|
| Pre-K | 24 | 11% |
| Kindergarten | 31 | 14% |
| Grade 1 | 32 | 14% |
| Grade 2 | 35 | 15% |
| Grade 3 | 29 | 13% |
| Grade 4 | 39 | 17% |
| Grade 5 | 38 | 17% |
This year's kindergarten class (31) is 18% smaller than its 5th grade class (38).
Student demographics
29%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 33% · STATE 69% · US 70%
Student head counts by race/ethnicity from federal NCES enrollment data. District, state, and US figures are each group's share of all public school students in that area (US excludes territories). Very small groups may be suppressed in the source, so categories do not always sum exactly to total enrollment.
Gender split
School pathway
Students here typically continue to
Costello School→Washington Middle School
Based on grade levels within Lyons SD 103. Attendance zones can vary; confirm enrollment with the district.
Test scores
IAR + ISA 2024-25 . % Proficient (Levels 4-5)English Language Arts
48.0%
IL avg 51.0% . +16.1pp since 2023
Math
25.2%
IL avg 37.9% . +12.4pp since 2023
What this means: On the IAR + ISA, Illinois's statewide test, about 48 of every 100 students at this school read and write at grade level and about 25 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 16 points since 2023, while math scores are up about 12 points.
IAR + ISA results by year
| School year | English Language Arts | Math |
|---|---|---|
| 2024-25 | 48.0% | 25.2% |
| 2023-24 | 31.9% | 12.8% |
% Proficient (Levels 4-5), all students and all tested grades.
Source: IAR + ISA. All students, all grades. See all years and grades →
BeatsExpectations
Demographically-adjusted score · methodologyTier
AS EXPECTED
Performing as predicted given the school's student profile
Actual proficiency
33.5%
composite math + reading, all grades
Predicted
28.7%
based on IL schools with similar FRL share
Beats by
+4.8pp
above demographic expectation
What this means: About 34% of students here test proficient in math and reading, compared with the roughly 29% typical for Illinois schools with a similar share of low-income students. BeatsExpectations measures results against demographically similar schools rather than by raw scores, and this school falls within the typical range, neither among Illinois's top nor bottom 10%.
BeatsExpectations runs a per-state regression of proficiency on free/reduced-lunch share, then scores each school by residual. How this is calculated →
Schools most like Costello School
Costello School's state test result (33.5% proficient) is higher than 1 of the 5 schools below with a result.
| School | Students | Low-income | Proficient |
|---|---|---|---|
| Costello School this school | 228 | 74.1% | 33.5% |
| Edison Elementary School Stickney | 282 | 74.1% | 43.5% |
| Home Elementary School Stickney | 256 | 71.5% | 39.6% |
| Ardmore Elementary School Addison | 230 | 79.6% | 26.4% |
| Piper School Berwyn | 292 | 70.2% | 47.4% |
| Dan H Pietrini Elementary School Franklin Park | 242 | 67.8% | 45.2% |
Matched among Illinois elementary schools on enrollment, the share of students from low-income families (eligible for free or reduced-price lunch), and racial and ethnic makeup. Proficient is the average share of students meeting the state standard across all of the school's state tests in 2023-24 and 2024-25, the same combined score our test-score rankings use. Online schools and schools serving specialized populations are not matched.
Where Costello School ranks
Among elementary schools| Measure | This school | In Illinois | In Cook County |
|---|---|---|---|
| State test proficiency ranked highest first | 33.5% | #1,140 of 1,925 | #341 of 760 |
| Math proficiency ranked highest first | 25.2% | #1,445 of 2,077 ▲ 55 | #456 of 829 ▲ 38 |
| Reading proficiency ranked highest first | 48.0% | #1,071 of 2,077 ▲ 34 | #350 of 829 ▲ 10 |
| Enrollment ranked largest first | 228 | #1,933 of 2,419 | #783 of 901 |
| Students per teacher ranked fewest first | 8.5:1 | #31 of 2,035 | #20 of 817 |
| Diversity index ranked most diverse first | 28.8% | #1,424 of 2,042 | #528 of 819 |
| Free and reduced lunch ranked highest share first | 74.1% | #652 of 2,132 | #420 of 804 |
| Enrollment change since 2017-18 ranked steepest decline first | -27.8% | #218 of 1,461 | #138 of 661 |
Ranked against other public elementary schools. Online schools are left out of every list, and test-score lists leave out schools that serve specialized populations. Each rank links to the full list. Arrows under a test-score rank show places moved since the prior test year, among schools tested both years.
4-year change
SY 2020-21 vs SY 2024-25Enrollment
228
-35 (-13%) vs 2020
-13% since 2000-01, when it was 261
Source: NCES Common Core of Data
Enrollment and staffing by year
| School year | Students | Teachers (FTE) | Students per teacher | Free and reduced lunch |
|---|---|---|---|---|
| 2024-25 | 228 | 26.7 | 8.5:1 | 74% (169) |
| 2023-24 | 221 | 25.2 | 8.8:1 | 75% (166) |
| 2022-23 | 257 | 28.2 | 9.1:1 | 65% (168) |
| 2020-21 | 263 | N/A | N/A | N/A |
| 2017-18 | 316 | 23 | 13.7:1 | 81% (255) |
| 2015-16 | 289 | 26 | 11.1:1 | 73% (210) |
| 2010-11 | 319 | 22 | 14.5:1 | 70% (222) |
| 2000-01 | 261 | 21 | 12.4:1 | N/A |
Source: NCES Common Core of Data. Rows are the federal collections on file for Costello School.
Since 2017-18: students down 28% (316 to 228); teachers up 16% (23 to 26.7).
About Costello School
Costello School is a low-enrollment elementary school in Illinois, with an address in Lyons. It covers pre-K through 5, with a total enrollment of 228 students. Statewide, elementary schools in Illinois average about 381 students each.
The 6 schools of Lyons SD 103, including Costello School, enroll 2,042 students.
Hispanic students make up 84% of enrollment at Costello School. Smaller groups are 9% White and 3% Black. For comparison, the population of Cook County is roughly 27% Hispanic. The school's diversity index is 29%, meaning two students picked at random have a 29% chance of belonging to different racial or ethnic groups.
Federal staffing data show 26.7 full-time-equivalent teachers at Costello School and a ratio of 8.5:1. This ratio sits 5.4 below the 13.9:1 average for elementary schools in Illinois. Free or reduced-price lunch eligibility covers 74% of students.
Test results at Costello School are 4.8 points above what its free or reduced-price lunch share predicts (33.5% actual, 28.7% predicted).
Costello School is located in Cook County, where the median household income is $83,498, roughly 43% of adults have a four-year degree or more, and the share of residents below the poverty line is 10%. Costello School is one of 1,406 public schools in the county.
The closest public school, J W Robinson Jr Elementary School, is about 0.8 miles from Costello School. There are at least 8 other public schools within five miles. On state test proficiency, Costello School ranks 6th in a group of 8 nearby schools.
Under the NCES locale system, Costello School is Suburb: Large.
2024-25 enrollment was 228, a 13% decrease from 263 in 2020-21.
Parents and students can post about sports tryouts, band and choir, and theater at Costello School. Alumni can share how the school prepared them.
Cook County at a glance
View full county profilePopulation
5,182,090
Census ACS
Median income
$83,498
Household, ACS
Bachelor's+
43%
Adults 25+
Poverty rate
10%
Below federal line
Schools in county
1,406
697,934 students
Quick facts
Related schools
Other schools in Lyons SD 103
- Washington Middle SchoolMiddle · 659 students
- Lincoln Elementary SchoolElementary · 366 students
- Edison Elementary SchoolElementary · 282 students
- Home Elementary SchoolElementary · 256 students
- J W Robinson Jr Elementary SchoolElementary · 251 students
Other schools in Lyons
- Washington Middle SchoolMiddle · 659 students
- J W Robinson Jr Elementary SchoolElementary · 251 students
Nearby schools
- J W Robinson Jr Elementary School0.8 mi · 251
- Lincoln Elementary School0.8 mi · 366
- Washington Middle School0.8 mi · 659
- Congress Park Elementary School1.4 mi · 419
- Riverside Brookfield Twp High School1.5 mi · 1,663
- Hollywood Elementary School1.5 mi · 114
Frequently asked questions
About Costello SchoolHow many students attend Costello School?
Costello School enrolls approximately 228 students in grades PK-05.
Is Costello School an elementary, middle, or high school?
Costello School is an elementary school covering grades PK-05.
How many teachers does Costello School have?
Costello School employs 27 FTE teachers, for a student-to-teacher ratio of 8.5:1.
What is the student diversity at Costello School?
Student demographics at Costello School are roughly 9% White, 84% Hispanic, 3% Black, 2% Asian, 2% Two or more.
Is Costello School public or private?
Costello School is a public K-12 school, overseen by Lyons SD 103.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.