DuPage County property record for 320 N Mill St, Naperville, IL 60540
| Property Type | General Industrial |
|---|---|
| Details | 7,820 sqft · built 1963 |
| Lot Size | 0.37 acres (16,117 sqft) |
| Owner | Company Name on Record |
| Tax Bill | $18,652 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 07-13-217-002 |
| Primary APN | 07-13-217-002 |
|---|
| Building Area | 7,820 sqft Gross Area |
|---|---|
| 1st Floor Area | 6,308 sqft |
| 2nd Floor Area | 1,102 sqft |
| Basement Area | 110 sqft |
| Finished Basement | 2 sqft |
| Unfinished Basement | 108 sqft |
| Year Built | Built 1963 |
|---|---|
| Effective Year Built | Effective 1963 |
| Construction Type | Brick |
| Lot Area | 16,117 sqft (0.37 acres) |
| Street Address | 320 N MILL ST |
|---|---|
| City | NAPERVILLE |
| State | IL |
| Zip | 60540-4440 |
| Property Category | Industrial |
| Property Type | Industrial > General Industrial |
| Local Zoning Code | I |
| Legal Description | WOODLAWN ADD /EX RR//EX S 15 FT/ /EX RR//EX S 15 FT/ /EX RR//EX S 15 FT/ E 1/2 |
| Legal Subdivision | WOODLAWN ADD |
| Legal Block | 1 |
| Legal Lot Number | 9,12 |
| Jurisdiction | DU PAGE IL |
| Township / Civil Division | NAPERVILLE |
| Census Block Group | 1 |
| Census Block | 1006 |
| Census Tract | 846504 |
Source: DuPage County records, as of August 17, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | Company Name on Record |
|---|---|
| Mailing Address | 320 N MILL ST, NAPERVILLE, IL 60540-4440 |
| Owner Type | Company |
| Vesting | Company |
| Deed Names | Name on Deed |
|---|---|
| Record Updated | Sep 20, 2026 |
Source: DuPage County assessment roll, as of August 17, 2026
| Type | Name |
|---|---|
| State | Illinois |
| County | DuPage County |
| County Subdivision | Naperville Township |
| Municipality | Naperville City |
| Unified School District | Naperville Community Unit District 203 (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2025 | $18,652.00 (+60.92%) | $319,909 (+78.32%) Land $43,816 Building $276,093 | $959,727 (+78.32%) Land $131,448 Building $828,279 |
| 2022 | $11,591.00 | $179,400 Land $79,170 Building $100,230 | $538,200 Land $237,510 Building $300,690 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
Source: FEMA National Flood Hazard Layer, effective September 1, 2025 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Community Rating System | Class 10 (0% premium discount) |
| Nearby Flood Policies | 2 in force |
| Nearby Flood Claims | 8 (1979–1996) |
| Claims Outside the SFHA | 1 of 8 |
| Most Recent Claim | Jul 1996 · Severe Storms And Flooding |
| Claims by Event |
|
Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Not rated no burnable land within ember reach |
|---|
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | NAPERVILLE serves 156,406 people · EPA ID IL0434670 |
|---|---|
| Water Source | Purchased surface water from DU PAGE WATER COMMISSION |
| Last State Inspection | Sep 2025 |
| Lead | 6 ppb (2026) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | 15 last 3 years |
Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.
Source: FCC Broadband Data Collection, based on 316 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Astound Broadband Cable · Fiber in parts of the area | 1,500 / 50 |
| Verizon Fixed Wireless | 1,000 / 75 |
| AT&T Fixed Wireless · DSL · Fiber in parts of the area | 100 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
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