A house in Aurora that closed for $360,000 this summer sits inside a city whose own real estate data can't agree on what a typical home costs. Check three sources in the same week and Aurora's reported home-price figures are $415,000 on one, $360,000 on another, and $326,890 on a third. None of them is wrong. Each one is describing a different slice of a city that Illinois quietly split four ways a long time ago.
Aurora is the second-largest city in Illinois, and it's one of the few cities in the region built across four separate county tax rolls at once: Kane, DuPage, Will, and Kendall. Kane County holds the northern half of the city, including the stretch through downtown along the Fox River. The southern and eastern edges drift into smaller, growing sections of DuPage and Will, while a newer ring of subdivisions on the far side of town falls under Kendall County's assessment office. A buyer touring three houses in one afternoon can cross all four county lines without a sign, a fence, or any visible change in the housing stock to mark the difference. The parcel number on the tax bill is the only proof of which county is actually doing the assessing.
Why three good sources report three different prices
The REALTOR Association of the Fox Valley publishes monthly sales data covering Kane and Kendall counties. Its July 2026 report put the median sold price at $415,000, up 2 percent from a year earlier, on 898 closed sales, an increase of 12 percent, with homes averaging 33 days on market. That number reflects real closings across Kane and Kendall counties, not just Aurora. It leaves out every sale recorded on the DuPage and Will county rolls.
Zillow's Home Value Index takes a different approach entirely. It's a model built from estimated property values across the full city, not a tally of closed sales in part of it. As of July 31, 2026, that index put Aurora's typical home value at $326,890, up 2.9 percent year over year. The same index put Naperville at $629,473 and the broader Chicago metro at $360,262, which puts Aurora's blended figure closer to the metro-wide number than to its higher-priced neighbor a few miles east.
Redfin lands in between, reporting an actual median sale price across the entire city rather than a model or a single-county subset. Over the three months ending June 2026, that median came to $360,000, up 1.4 percent from the same period a year earlier, with homes fielding three offers on average and selling in about 46 days.
Three legitimate numbers, three different jobs. None of them measures the same thing, and averaging them into a single "Aurora price" produces a figure that describes nowhere in particular.
What the county line costs on an identical house
The four counties don't just count sales differently. They tax them differently too. Effective property tax rates vary enough by county that the same purchase price carries a different annual bill depending on which side of the line the parcel sits.
| County | Effective property tax rate | Annual tax on a $360,000 home |
|---|---|---|
| DuPage | 2.09% | $7,524 |
| Will | 2.35% | $8,460 |
| Kane | 2.39% | $8,604 |
| Kendall | 2.53% | $9,108 |
On the same $360,000 house, the property tax line alone swings by $1,584 a year, or roughly $132 a month, depending only on which county's assessment office signs the bill. That gap exists before any difference in condition, lot size, or loan terms enters the picture. It's a cost built entirely into the parcel number.
The homeowner exemption doesn't travel the same distance
Illinois' General Homestead Exemption reduces the assessed value used to calculate a tax bill, and the size of that reduction isn't uniform across the state. In DuPage, Kane, and Will, three of Illinois' five officially designated collar counties, the Property Tax Almanac says the exemption knocks $8,000 off a home's equalized assessed value. Elsewhere in Illinois, the standard reduction is $6,000. Kendall County borders Kane and covers part of Aurora, so a homeowner filing on the Kendall side of the city is better off confirming the reduction amount directly with the township assessor.
The filing process differs by county too. In Cook County, the exemption generally renews on its own once it's on file. In the four counties touching Aurora, a homeowner typically files once and the exemption continues without an annual reapplication, though the paperwork runs through a different office depending on which county holds the parcel.
A new clock for anyone holding a distressed parcel
Landlords and investors carrying a property with delinquent taxes anywhere in Illinois are working against a longer clock than they were a few months ago. Public Act 104-0553, effective July 10, 2026, amended the state's tax sale statute, 35 ILCS 200/21-350, to extend the redemption period on tax sale certificates to three years from the date of sale, for certificates issued on or after that date. Certificates issued before then still run on the prior schedule. For an investor holding parcels across more than one of Aurora's four counties, that means tracking two different redemption timelines at once, since each county administers its own tax sale calendar even though the underlying statute is the same statewide.
What this means before you compare Aurora to anywhere else
None of this makes Aurora harder to buy into. It makes the single number on a listing site less useful than it looks. A buyer comparing Aurora to Naperville or Hoffman Estates on median price alone is really comparing a blended four-county model to a figure produced under a different set of rules entirely. A buyer comparing two houses inside Aurora at the same list price is skipping past the one detail, the county line, that decides what that price actually costs to hold every year afterward.
The parcel number on any Aurora listing shows which of the four counties is doing the assessing. That detail is worth checking before comparing a tax estimate, an exemption amount, or a median price against anything else on the market.
Common questions
How do I find out which county an Aurora property is in? The parcel number on the tax bill identifies the county, and the assessment office listed on that bill will confirm it. Aurora Township maintains its own property search tool for parcels on the Kane County side of the city.
Does a higher effective tax rate mean a worse deal? Not by itself. The composite rate funds municipal, school, township, and other local services, and it's one cost to weigh against price and location, not a verdict on the property.
If you're weighing a house in Aurora against one in a neighboring suburb, or comparing two Aurora addresses that happen to sit in different counties, Alka Patel can walk through what each parcel's tax line and exemption will actually look like before you write an offer. Let's Connect.
This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.
