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Elementary · Regular · Grades K to 5

Mary Lou Cowlishaw Elementary, Naperville, IL

Mary Lou Cowlishaw Elementary is a public elementary school in Naperville, part of Indian Prairie CUSD 204. It enrolled 589 students in 2024-25, with 14.7 students per full-time teacher.

Enrollment and teachers

Students
589
Teachers (FTE)
40.0
Students per teacher
14.7
Grades
K to 5

This school's ratio is about the same as the district figure of 14.5. The Illinois average across schools is 13.7. Ratios count all teachers, including specialists, so they are lower than typical class sizes.

This school14.7
District14.5
Illinois13.7
United States15.3

School details

Address
1212 Sanctuary Ln, Naperville, IL 60540
Phone
(630)428-6100
District
Indian Prairie CUSD 204
County
DuPage County
Level
Elementary
Type
Regular
Status
Open
Charter
No
Virtual
No
Locale
City: Midsize
NCES school ID
174169002094
Location from NCES coordinates. Map data OpenStreetMap contributors. Open larger map

School meals

Counts of students eligible for free or reduced-price lunch, as reported to NCES.
Free or reduced-price lunch
14624.8% of enrollment.
Community Eligibility Provision
No

Schools in the Community Eligibility Provision (CEP) serve free meals to all students, so their free lunch counts often reflect direct certification or total enrollment. Free and reduced lunch shares are not comparable between CEP and non-CEP schools.

Related schools

Other elementary schools in Indian Prairie CUSD 204

Elementary schools elsewhere in Naperville

We publish official enrollment and staffing data, not ratings or test scores.

Source: NCES Common Core of Data 2024-25 and F-33 finance 2020, via the Urban Institute Education Data Portal. Last reviewed October 2026. Blank values are not available, not applicable or suppressed in the source. See the methodology.