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The DuPage-Will split
Naperville has roughly 150,000 residents and is Illinois's third-largest city. The majority of the city — including the historic downtown, the northeastern residential areas, and the corporate campus corridor along I-88 — falls in DuPage County and the 18th Judicial Circuit. The southern and southwestern portions of Naperville, including communities near Route 59 and 75th Street, fall in Will County and the 12th Judicial Circuit.
The split matters because DuPage County circuit court records are in Wheaton; Will County circuit court records are in Joliet. A DuPage-only search conducted for a Naperville resident who lives in the Will County portion will return nothing — not because they have no record, but because the wrong county court was searched. The ISP statewide name search eliminates this problem by covering both counties simultaneously.
Which county is my address in?
| Naperville area | County | Judicial circuit | Courthouse |
|---|---|---|---|
| Downtown Naperville, northeast Naperville, I-88 corridor | DuPage County | 18th Judicial Circuit | Wheaton, IL |
| South Naperville, southwest Naperville (Route 59/75th St. area) | Will County | 12th Judicial Circuit | Joliet, IL |
The DuPage County GIS parcel viewer or the Will County GIS parcel viewer can confirm the county for a specific address. South Naperville addresses with 60564 ZIP codes are often — but not always — in Will County. Street-level parcel confirmation is more reliable than ZIP code inference.
ISP statewide covers both Naperville counties
The Illinois State Police name search covers all 102 Illinois counties — including both DuPage and Will — without pre-selection. It is the correct first tool for any Naperville search where county is uncertain. Run it before routing any document request to a specific courthouse.
Accessing records in each county
DuPage County — 18th Judicial Circuit (courthouse: Wheaton)
DuPage County Circuit Court maintains an online case portal for felony criminal, civil, and family matters. This covers the majority of Naperville, including the corporate employer corridor and the most densely populated residential areas. Document requests go to the DuPage County Clerk of Circuit Court in Wheaton. See our DuPage County guide for full detail.
Will County — 12th Judicial Circuit (courthouse: Joliet)
Will County Circuit Court also maintains an online case portal. This covers the southern and southwestern Naperville portions. Document requests go to the Will County Clerk of Circuit Court in Joliet. See our Will County guide for full detail.
| Record type | How to access for Naperville |
|---|---|
| Criminal history context | ISP statewide name search — covers both DuPage and Will simultaneously |
| Court case detail (DuPage portion) | DuPage County circuit portal — 18th Judicial Circuit, Wheaton |
| Court case detail (Will portion) | Will County circuit portal — 12th Judicial Circuit, Joliet |
| Vital records (marriage, divorce index) | Illinois IDPH VitalChek portal (statewide from 1962) |
| Property records | DuPage County Recorder OR Will County Recorder — confirm county first |
Start Here: Enter Any Name To View Records
Best sites to review first
Before routing to DuPage or Will county portals, these are the two services I recommend reviewing first.
| Service | Why people use it | Best fit |
|---|---|---|
| Instant Checkmate | Useful for establishing which part of Naperville the subject is in — DuPage or Will — before routing to the correct courthouse. | Quick first-pass searches |
| TruthFinder | Useful for broader address history across the Naperville corridor and adjacent suburbs in DuPage and Will counties. | Expanded public-record context |
These services are not for employment, tenant screening, insurance, credit, or any other FCRA-regulated use.
Frequently asked questions
Most of Naperville is in DuPage — do I really need to check Will County too?
Yes, if the specific address is in the southern or southwestern part of the city. The Will County portion of Naperville is a significant residential area along the Route 59 and 75th Street corridor, not a minor edge. If the address is unknown or uncertain, run ISP statewide first — it resolves the county question without requiring you to pre-select one or the other.
Does Naperville have its own court system?
No. Naperville is served by two separate circuit court systems depending on which county the address is in — the 18th Judicial Circuit (DuPage County, courthouse in Wheaton) for most of the city, and the 12th Judicial Circuit (Will County, courthouse in Joliet) for the southern and southwestern portions. There is no Naperville Municipal Court or Naperville-specific court filing system.
Can I use these searches for jobs, housing, or insurance decisions?
No. The services discussed on this page are not consumer reporting agencies and the information here is not a consumer report. They should not be used for employment, tenant screening, insurance underwriting, credit, or any other purpose regulated by the Fair Credit Reporting Act.
