ZIP code 60504 sits primarily in DuPage County, Illinois, with a smaller western slice in Kane County. Roughly 80 percent of the ZIP’s land area is in DuPage and about 20 percent is in Kane. The associated city is Aurora, Illinois’s second-largest city and one of the few that crosses multiple county lines.1City of Aurora, IL. About Our City
DuPage or Kane: Which Side Are You On
Most addresses in 60504 are in DuPage County. That’s the county you’ll list on government forms, use for voter registration, and pay property taxes to for the majority of the ZIP code. The western portion of 60504 falls into Kane County instead, and the ZIP code alone doesn’t tell you which side of the county line a specific address is on.
The practical consequence: two neighbors on the same street in 60504 can, in some spots, sit in different counties. So if you’re checking your county for anything official, look up the street address rather than relying on the ZIP.
Why the County Matters More Than the ZIP
ZIP codes exist for mail delivery. Counties are the unit that actually controls the government functions attached to your address. In 60504, the DuPage-versus-Kane distinction shows up in several places:
- Property taxes. DuPage and Kane each run their own assessment process and rate structure. If you’re buying in 60504, confirm the parcel’s county before estimating a tax bill.2DuPage County. DuPage County Board Approves Fiscal Year 2026 Budget
- Courts. Civil and criminal matters go to the circuit court for the county where the property or incident is located. DuPage is the 18th Judicial Circuit; Kane is the 16th.
- Voter registration. You register with the clerk of the county your home address is in, and your ballot reflects that county’s districts.
- Recording documents. Deeds, mortgages, and liens are recorded with the recorder in the county where the property sits. File in the wrong county and the document isn’t properly recorded.
When a form asks for your county, don’t infer it from the ZIP code.
How to Confirm the County for a Specific Address
The USPS ZIP Code Lookup tool will verify a ZIP code’s city and state, but it’s built for mail routing and won’t identify your county.3United States Postal Service. ZIP Code Lookup
For the county answer, use the GIS parcel viewer run by the county government itself. DuPage County and Kane County both maintain online mapping portals where you enter an address and see the county, township, and taxing districts tied to that parcel. These portals draw from official property records, which makes them more reliable than third-party ZIP lookup sites that estimate county boundaries from the outside.