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DuPage County · Illinois

Naperville Township property tax appeals

A Naperville Township property tax appeal starts with the DuPage County Board of Review, then the Illinois Property Tax Appeal Board. We are still checking this season's dates against official sources, so confirm the deadline on your assessment notice or the office's website.

Source: DuPage County Board of ReviewLast checked

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Enter the address or parcel number from your notice. We compare the assessment with similar homes and show the numbers, whatever they are. You decide and file yourself.

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DuPage County Board of Review
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  • Independent guide — not affiliated with Naperville, DuPage County or any government agency.
Last updated
October 1, 2026
Sources last checked
October 3, 2026
Status
Verified guide

How we verify facts

When and where do I file a Naperville Township property tax appeal?

Who hears a Naperville Township appeal?

The stages in order. We are not affiliated with any of these offices.

  1. DuPage County Board of Review

    Filing: complaint

    Official site

  2. Illinois Property Tax Appeal Board

    Filing: appeal

    Official site

When is the Naperville appeal deadline?

Appeal period: Naperville Township's formal appeal window is a strict 30 days after its publication date, which usually falls in late fall. Newspaper: Naperville Township's 2026 assessment changes were published in Naperville Sun (published 2026-09-11).

Deadline detailAppeal period
Naperville Township's formal appeal window is a strict 30 days after its publication date, which usually falls in late fall.[1]
Deadline detailNewspaper
Naperville Township's 2026 assessment changes were published in Naperville Sun (published 2026-09-11).[2]

How do I file a property tax appeal in Naperville?

Naperville Township owners can request an Assessor Review by submitting evidence; the office replies whether it will reduce the value. Reviews are available any time of year.

Informal review
Naperville Township owners can request an Assessor Review by submitting evidence; the office replies whether it will reduce the value. Reviews are available any time of year.[1]

Who can answer questions about my assessment?

Hours: The Naperville Township Assessor's office is open Monday to Friday, 8:30 a.m. to 4:30 p.m. Office: The Naperville Township Assessor's office is at 139 Water St, 2nd Floor, Naperville, IL 60540; phone 630-355-2444.

ContactHours
The Naperville Township Assessor's office is open Monday to Friday, 8:30 a.m. to 4:30 p.m.[3]
ContactOffice
The Naperville Township Assessor's office is at 139 Water St, 2nd Floor, Naperville, IL 60540; phone 630-355-2444.[3]
ContactWebsite
The Naperville Township Assessor's pages are at napervilletownship.com/assessor/, with parcel and sales searches.[4]

Upcoming appeal deadlines in every county we track

What do Naperville Township property taxes and assessments look like?

Figures from public records and the Census, each with its source. They describe the county's homes as a group, not the value of any one home.

How often is property reassessed in Naperville?

Naperville Township, like all DuPage townships, is generally reassessed every four years (2019 and 2023 were general reassessment years; the next is 2027). Naperville Township's 2026 values are as of January 1, 2026, from 2023–2025 sales, with more weight on recent sales.

Reassessment cycle
Naperville Township, like all DuPage townships, is generally reassessed every four years (2019 and 2023 were general reassessment years; the next is 2027).[2]
Valuation date
Naperville Township's 2026 values are as of January 1, 2026, from 2023–2025 sales, with more weight on recent sales.[1]
State equalization factorTownship multiplier
The 2026 Supervisor of Assessments equalization factor for Naperville Township (DuPage County) is 1.0676.[2]

What do home values and property taxes look like in Naperville?

Naperville Township (DuPage County) parcel numbers begin with 07.

Parcel number (PIN) prefix
Naperville Township (DuPage County) parcel numbers begin with 07.[2]

Other places nearby

Illinois property tax appeals: all counties

Where do these facts come from?

  1. [1]Appeal - Naperville Township Assessor's OfficeOfficial guide or FAQ · last checked Oct 1, 2026
  2. [2]Assessment Status | DuPage Co, IL (Supervisor of Assessments)Official notice, form, calendar or rules · last checked Oct 1, 2026
  3. [3]Contact Information - Naperville TownshipOfficial guide or FAQ · last checked Oct 1, 2026
  4. [4]Township Assessor Directory | DuPage Co, ILOfficial notice, form, calendar or rules · last checked Oct 1, 2026
  5. 5.County open data: dupage assessmentsRetrieved Sep 27, 2026; aggregated by us for the charts above.
  6. 6.County open data: dupage assessmentsRetrieved Sep 27, 2026; aggregated by us for the charts above.
  7. 7.County open data: dupage parcelsRetrieved Sep 27, 2026; aggregated by us for the charts above.

Not affiliated with Naperville Township or any government agency. Not legal advice. Not an appraisal.

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