Naperville spans both DuPage County and Will County, with 87th Street marking the general dividing line. Residents north of the street belong to DuPage, while those south fall under Will County. This dual‑county status influences property taxes, voter registration, and local services, helping you understand which jurisdiction applies to your home or business.
Dual‑County Overview
Naperville, Illinois straddles bothDuPage CountyandWill, making it a true dual‑county municipality. The city’s historic downtown and roughly two‑thirds of its residents sit north of 87th Street within DuPage, while newer master‑planned neighborhoods extend southward into Will.
Because the municipal footprint spans two counties, the questionwhat county is Naperville, Illinois in DuPage or Willoften surfaces for newcomers. The answer is simple: the city belongs to both, but the bulk of its population and core services are anchored in the DuPage side.
Homebuyers frequently encounter this split when reviewing listings or calculating property taxes. A prospective buyer may see a home listed under “Naperville, IL” without realizing that the tax rate, school district alignment, and coun...
