Pull up three different listing platforms for a home in Ashbury and you'll get three different answers to a question that sounds like it shouldn't have more than one. One site tags the subdivision under Will County. Another simply lists it as Naperville, no county specified, the assumption apparently being that all of Naperville is the same place. Wolf Spirit Deck, a local deck-building contractor who works across these south Naperville subdivisions, puts it more bluntly in a cost guide for the area: the stretch south of 95th Street, which includes Ashbury, is newer construction where "part of it sits in Will County rather than DuPage."
That's not a data entry error. Illinois Official Records describes Naperville as a city that physically straddles two counties, and Ashbury sits close enough to that seam that its own marketing materials can't settle on which side it's describing. For a buyer comparing Ashbury to another south Naperville subdivision on price alone, that discrepancy is worth more than a footnote. It changes who assesses your home, when your appeal window closes, and how much you actually pay each year on an identical purchase price.
Two Counties, One Subdivision Name
The counties use separate property-tax systems. Ashbury was built out largely in the 1990s on 95th Street east of Book Road. That helps explain why listing platforms may categorize Ashbury differently from comparable-looking subdivisions a mile north.
The deck contractor's read on the geography lines up with how the subdivision actually gets categorized in county-level real estate data, and it matters because the two counties don't just have different office addresses. They run separate property-assessment systems.
What the Line Actually Costs
Illinois assesses residential property in both counties, but the systems diverge. DuPage-side Naperville carries a median effective property tax rate of roughly 2.05%, with real spread underneath that median: homes in the 60563 ZIP code run closer to 2.03%, while 60564 runs closer to 2.23%, a gap tied to which school district levies and local assessment districts overlap that specific ZIP. Will County's Naperville addresses carry a higher median effective rate, around 2.35%, reflecting a different set of taxing bodies stacked on top of the base county levy.
Run those percentages against Ashbury's own numbers and the gap stops being abstract. One current subdivision-level snapshot of Ashbury's active listings puts the average annual property tax bill at $12,647 against an average list price of $587,500, an effective rate between the two county median rates cited above. A buyer cross-shopping Ashbury against a DuPage-side subdivision at the same list price should expect the annual tax line to land differently, not because the homes are worth different amounts, but because two different counties are doing the math.
| DuPage-side Naperville | Will County-side Naperville | |
|---|---|---|
| Median effective tax rate | ~2.05% (ZIP range 2.03%–2.23%) | ~2.35% |
| Assessment notices mailed | Spring, typically by mid-May | Spring, similar window, separate mailing |
| Appeal deadline | Ownwell lists June 1 each year | Set independently by the county |
Two Assessors, Two Calendars
The rate gap is the number a spreadsheet will show you. The calendar gap is the one that actually trips people up after closing. DuPage County sends its assessment notices in the spring, and homeowners who think their assessed value is too high can file a formal appeal by the date shown in the table. Will County runs its own notice and appeal timeline, on its own schedule. Even the property tax bill itself follows the county split.
For an Ashbury buyer, the practical takeaway isn't complicated once you know to ask. Check which county your specific parcel falls in before you assume your appeal deadline matches what a friend in a DuPage-side Naperville subdivision tells you theirs is, and before you assume the assessor's office that mailed your neighbor's notice is the one that will mail yours. Both DuPage and Will County maintain free online parcel lookup tools, and the fastest way to confirm which office governs a given Ashbury address is to check the county name printed directly on that property's existing tax bill.
The Line Runs Through the HOA Books Too
Ashbury's own homeowners association fee structure adds a second, smaller layer of the same pattern. Monthly dues in the subdivision aren't a flat number across all 1,100-plus homes. They vary by section and by the specific maintenance agreements tied to that section, a detail confirmed in the subdivision's own HOA FAQ material. Two Ashbury owners can be paying different monthly dues for access to the same clubhouse and aquatic center depending on which phase of the development their home was built in, the same way two owners a few blocks apart can be paying different effective tax rates depending on which county line their lot fell on when Ashbury was platted.
None of this makes Ashbury a worse purchase than a comparably priced DuPage-side subdivision. Naperville's overall reputation for strong schools and stable neighborhoods holds regardless of which county collects the check, and Indian Prairie School District 204, which feeds Patterson Elementary, Crone Middle School and Neuqua Valley High School, serves Ashbury addresses on both sides of that line. What the county split does is make the carrying-cost comparison less obvious than the sale price suggests. A buyer who prices out two Ashbury homes, or an Ashbury home against a similarly priced subdivision to the north, and stops at the list price is comparing half the picture.
A Few Questions Worth Settling Early
Does the county line affect which schools an Ashbury home is zoned for? No. Indian Prairie School District 204 serves Ashbury addresses regardless of whether the specific parcel sits in DuPage or Will County. The county split affects taxation and assessment, not school attendance boundaries.
How do I find out which county a specific Ashbury address falls in? Check the county name printed on that property's current tax bill, or search the address directly through either the DuPage County property lookup portal or the Will County property search portal. If the address doesn't return a result in one system, try the other.
Does the county line show up anywhere besides the tax bill? Yes, in a smaller way. Assessment notices, appeals, and tax bills also follow the county split. HOA dues vary too, though that split follows development phase rather than the county boundary.
If you're weighing an Ashbury address against another south Naperville subdivision and want the actual carrying costs laid out side by side before you write an offer, that's the kind of homework Dave Swanson does before a client ever sees a listing. Schedule a free consultation and get the county line, the tax math and the HOA section your specific address falls under sorted out before it becomes a surprise at closing.
This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.
