The top reported proficiency rate is 62% in English language arts. The lowest is 34% in Science.
Original Research by School Decision on Clifford Johnson School
Clifford Johnson School is a public elementary school serving kindergarten through fifth grade in Warrenville, a far-west Chicago suburb in DuPage County. The school enrolls a small-to-mid-sized population of students, with meaningful racial and ethnic diversity: roughly half the enrollment is Hispanic, roughly a third is white, and smaller shares are Asian, Black, or multiracial. The school's free-or-reduced-price lunch data was not available, limiting visibility into the share of economically disadvantaged students.
The school is part of Community Unit School District 200, which spans Warrenville and Wheaton. In November 2024, district voters approved a large bond referendum—the largest in district history—to fund major upgrades at three middle schools. While Clifford Johnson serves grades below the middle school level, the referendum signals a district committed to facility improvements and tax-efficient financing, with projected interest savings passed on to homeowners over the repayment period.
Illinois state assessment data from 2024-25 shows mixed results that warrant attention. In third and fourth grade math, student proficiency sits in the moderate range, though performance dips markedly by fifth grade. English language arts proficiency across grades three through five stays somewhat more consistent, clustering around the mid-to-upper range. In the one science assessment given—fifth grade—proficiency stands at about one-third, a softer result. The school's proficiency index (the mean of tested results across subjects and grades) places it below the midpoint among the county's forty-eight districts. A parent may want to look into this further with the school to understand whether specific grade levels or subjects are receiving targeted support, and what the school sees as the path forward for strengthening performance in mathematics and science.
The housing market in Warrenville has stabilized in recent months, with home values modest and rents affordable for the suburbs. Families considering the area can expect a typical home price in the mid-range, with mortgage affordability at roughly typical for the region and rental housing at reasonable cost relative to local income. Warrenville itself is in the midst of a growth phase: a two-digit annual percentage increase in new rental units has roughly doubled the rental housing supply, and the city is actively redeveloping its historic Old Town core with mixed-use and middle-housing overlays adopted in 2024. Schools serving the community operate on suburban campuses rather than downtown, so school life is car-dependent, as is most of Warrenville's daily activity. The town is shaped by forest preserves, the Illinois Prairie Path, and the Fermilab boundary, giving it a semi-rural character despite suburban density.
Clifford Johnson itself is a straightforward neighborhood elementary school with no special magnet or charter designation. No information on class size, staffing, special education or English learner populations, or discipline climate was available. The school serves its grade band only, so state testing data for middle and high school grades does not apply. For families choosing among area elementary schools, this profile shows an accessible, community-based setting with a diverse student body and modest proficiency levels that fall short of county peers. The immediate context is one of local growth and change in Warrenville, paired with a district putting resources into facility upgrades for secondary grades.
See more original research from School Decision →