Mill Street Elem School

Set in Naperville, Illinois, Mill Street Elem School is an expansive elementary campus, part of Naperville CUSD 203. It caters to 600 students across grades K through 5. Compared to the state average of about 381 students per school, that is 57% larger than typical.

Naperville CUSD 203 runs 22 schools in total, collectively educating 16,047 students. Mill Street Elem School is one of those campuses.

In terms of who attends, Mill Street Elem School reports that 46% of students identify as White, with the remaining enrollment distributed across several groups; the rest breaks down as 20% Hispanic, 16% Asian, 11% Black, 7% multiracial. That is noticeably less White than the county at large, where the share is closer to 65%.

In terms of school funding signals, Staff filings list 48 full-time-equivalent teachers, which works out to roughly 12.5:1 students per teacher. The state averages around 13.9:1, so this campus is tighter than the state norm typical. Roughly 35% of students at Mill Street Elem School qualify for free or reduced-price lunch, often used as a Title I proxy.

On a demographically-adjusted basis, Mill Street Elem School sits in the top 10% of Illinois schools after the BeatsExpectations adjustment. Predicted proficiency for the school's FRL share is roughly 51.5%; actual is 73.2%, +21.7 points clear of the demographic baseline.

Across the wider county, the surrounding county (DuPage County) records that median household earnings sit near $112,096, 52% of adults hold a bachelor's degree or higher, and the poverty rate sits near 5%. Across DuPage County's 277 public schools (combined enrollment of about 138,557 students), Mill Street Elem School is one campus in the mix.

The closest other public school is Naperville North High School, roughly 0.4 miles away. 8 of the 8 nearest public schools sit inside a five-mile radius. On composite proficiency, Mill Street Elem School comes 4th of 9 in the immediate cluster, beneath the nearby-schools average of 73.8%.

The campus sits in a downtown setting.

Looking at the recent track record. Looking back 7 years, enrollment at Mill Street Elem School has contracted 9%, going from 660 students in 2018 to 600 in 2025. The White share of enrollment contracted from 51% to 46% over that span. Class-load math has tightened: from 14.8:1 in 2018 to 12.5:1 in 2025.

On allk12, recent activity here tends to focus on fundraisers, lost-and-found posts, and report-card season. Posting is open to anyone connected to the school.