Naperville ZIP Codes, Counties and Population Explained

Naperville spans parts of DuPage and Will counties. A Naperville postal address, ZIP code, county and city limit answer four different questions. For an exact property, use the USPS ZIP lookup for mailing and the City of Naperville’s boundary and township resources for jurisdiction. The U.S. Census Bureau estimates the city’s July 1, 2025 population at 153,114; that dated city estimate is not a count for every address carrying a Naperville ZIP code.

What county is Naperville in?

The City of Naperville says its incorporated area includes portions of DuPage County and Will County. It also crosses several townships. County, township and school-district boundaries are separate from the postal city in an address. Use the city’s township and map resources and the relevant county’s property record for a specific parcel.

Which ZIP codes are associated with Naperville?

For example, Metra gives Naperville station a 60540 address, the Park District gives Knoch Knolls Park a 60565 address, and local operator addresses also use other Naperville ZIPs. Examples are not a complete ZIP list and do not draw the city boundary. Type the full street address into the USPS ZIP Code Lookup to get its mailing ZIP. For taxes, services or school assignment, use the relevant government or district map for that parcel.

What is Naperville's population?

The Census QuickFacts page reports a July 1, 2025 population estimate of 153,114 for Naperville city, Illinois (V2025). The 2020 Census count was 149,540. These are different products and dates. Cite the year and city geography whenever sharing a population number; a ZIP-based population would measure a different area.

How do you verify a home before moving?

Ask for the exact parcel and verify the mailing ZIP with USPS, municipal boundary with the city, county through the assessor, school assignment with the district, and transit access with the operator. A listing’s neighborhood label is useful orientation but not an official boundary. Our moving guide covers broader planning, and our commute guide covers transport choices.