Are Zillow estimates accurate? Zillow answers that question itself, and the answer is more honest than most people expect. The company publishes a nationwide median error rate of roughly 1.74 to 2.4 percent for homes actively listed, and 7.0 to 7.49 percent for off-market homes.
On a $500,000 home, a 7.2 percent error is about $36,000. And median means half of all estimates are off by more than that.
The valuation is the part people know to question. Over the past several weeks I have been verifying community data across Cobb, Cherokee, Paulding, and Bartow against primary sources, and the property information on these sites turns out to be less reliable than the estimates.
Here is what I actually found.
Amenity Lists Include Things That Do Not Exist
This is the most striking pattern, and I documented it in three separate communities.
A major listing aggregator publishes an amenity list for one large Canton community that includes golf, a country club, concierge service, a dry dock, racquetball, and powered boating. The community’s own materials describe a swim and tennis facility, clubhouse, fitness center, pickleball, playgrounds, trails, and lake access. No golf course. No marina.
The same site gives a Dallas community in Paulding County a community dock, a country club, a gated entrance, golf, a lake, and a restaurant. That association’s own website describes a pool with a splash pad, three tennis courts, a basketball court, a tennis pavilion, a playground, and a clubhouse.
The same site gives a Canton community boating, a dry dock, powered boats, racquetball, a restaurant, and waterfront. The homeowners association describes none of it.
Three communities, the same fictional features. These read as generic database fields rather than verified information, and a buyer who tours expecting a marina is going to be disappointed.
County Labels Are Wrong on ZIP Code Sites
This one matters in our market more than almost anywhere.
One ZIP code reference site labels both the 30101 and 30102 pages as Acworth, Bartow County, Georgia. That is wrong for the large majority of addresses in both ZIP codes and flatly wrong for every address inside the city limits, since the City of Acworth states plainly that its residents live in Cobb County only.
The Acworth mailing address genuinely spans Cobb, Cherokee, Paulding, and Bartow. A site that assigns one county to the whole ZIP is not describing reality.
Your county determines your property tax rate, your school district, your vehicle emissions requirement, and which tax commissioner handles your homestead exemption. Getting it from a ZIP lookup rather than a parcel record is how buyers get three weeks into a transaction believing they are buying somewhere they are not.
County Search Filters Return Properties From Other Counties
I ran a Bartow County horse property search on a national land listing site.
Among the results was a 51-acre equestrian property described as located just outside Covington, Georgia. Covington is in Newton County, roughly eighty miles from Bartow.
If a county filter can miss by eighty miles, the filter is a convenience feature rather than a boundary. Verify the county from the parcel record, not from the search you clicked.
Price Data Goes Stale and Stays Published
Community profile pages are the worst offenders here, because they rank well and never get dated clearly.
One profile of an Acworth community still publishes a price range of roughly $225,000 to $599,000 from a post written around 2016. Another site lists an Acworth community’s average price near $322,856 at $108 per square foot, figures that bear no resemblance to current activity where single listings run well above $500,000.
A buyer who finds those numbers and builds expectations on them will be badly miscalibrated, and a seller who finds them may underprice a home by six figures.
Check the publication date on any community profile before you believe its pricing. If there is no date, treat that as its own answer.
Basic Figures Get Mislabeled
Two examples from my own verification work.
One real estate site states a Dallas community’s HOA assessment is $708 “assessed monthly.” Every other source, including the association, describes annual dues in the $480 to $550 range. The $708 figure appears to be an annual number mislabeled as monthly, which would overstate the cost by a factor of twelve.
Another site publishes two different average annual property tax figures for the same Canton community on two different pages of its own website, $3,866 on one and $4,985 on the other. Both cannot be right.
The same publisher lists a maximum home size of 13,068 square feet for a Canton community where nothing approaching that exists.
These are not judgment calls. They are data quality failures, and they are sitting on pages that rank for community searches.
School District Information Is Frequently Outdated
Attendance zones shift as districts add capacity, and published community profiles do not shift with them.
For one Acworth community I found two different elementary schools named across sources, with older profiles listing one and newer ones listing another. Neither is necessarily wrong. One is simply older than a rezoning.
This matters enormously in ZIP code 30102, which contains schools from three separate districts. Allatoona Elementary is Bartow County. Oak Grove and Clark Creek are Cherokee County. Pitner is Cobb County. All four carry Acworth 30102 mailing addresses.
No ZIP-level source can tell you the district for an address in 30102, because three districts operate inside it. Use the district’s own locator at the exact street address, every time.
Even Agent Content Gets Local Geography Wrong
I am not exempting my own industry from this.
A competing agent’s guide describes Cauble Park on Lake Acworth as one of the most scenic pet-friendly parks in Cherokee County. Cauble Park is in Acworth, in Cobb County.
That is the kind of error that comes from writing about a market from a template rather than from driving it. It is also the kind of error a local reader catches instantly, which is precisely why it damages credibility.
When you read any local guide, including mine, the test is whether the specifics hold up. Named streets, named schools, named ordinances, and figures you can verify. Vague enthusiasm is what fills the space where knowledge should be.
What These Sites Are Genuinely Good For
None of this means avoid them, and I want to be fair about their value.
They are excellent for browsing inventory, seeing photographs, tracking new listings, and getting a rough sense of a market. Zillow publishes its own accuracy data, which is more transparency than most automated valuation models offer, and the on-market median error of under 2.5 percent is genuinely useful for a ballpark.
What they cannot reliably tell you is the county, the school district, the actual amenities, the current HOA dues, the real tax figure for a new owner, or what a specific home is worth today. Those come from parcel records, association documents, district locators, tax commissioners, and closed comparable sales.
Use the sites to find candidates. Verify everything that would change your decision.
How I Verify Before Writing an Offer
Five checks, none of which cost anything.
Pull the parcel’s tax record for the county, the parcel ID, and the current tax figure. Call or search the homeowners association for actual dues, what they cover, and the real amenity list. Run the school locator at the exact street address. Ask the county tax commissioner what a new owner would pay at the purchase price with only the buyer’s own exemptions. And price against recent closed sales rather than any automated estimate.
That takes under an hour and it has caught things that would have cost clients real money.
The listing sites are a starting point. Buyers across Acworth, Kennesaw, Dallas, Cartersville, and Woodstock who treat them as a finishing point are the ones who discover the golf course does not exist after they move in.
Frequently Asked Questions
How accurate is a Zestimate really?
Zillow publishes the figures itself. The nationwide median error runs roughly 1.74 to 2.4 percent for homes actively listed and 7.0 to 7.49 percent for off-market homes. Median means half of all estimates are off by more than that. On a $500,000 home, a 7.2 percent error is about $36,000. It is a starting point, not an appraisal or a pricing recommendation.
Why do listing sites show amenities a community does not have?
The lists appear to be generic database fields populated automatically rather than verified against the community. I documented three Northwest Atlanta communities where a major aggregator published golf courses, country clubs, marinas, and restaurants that the homeowners associations do not describe. Verify amenities with the association directly.
What should I verify before making an offer?
The county from the parcel tax record, the school assignment from the district’s locator at the exact address, the HOA dues and actual amenities from the association, the tax figure from the county tax commissioner at your purchase price with your own exemptions, and the value from recent closed comparable sales. Those five checks take under an hour.
Want the Verified Version?
I pull the parcel record, call the association, and run the school locator before writing any offer. If you want that done on a specific listing before you get attached to it, call me.
(404) 867-3869 | nicolefrance-realestate.com/contact/
Selling and wondering what your home is actually worth? Start with a home value estimate, read what past clients say, or learn more about my background.
Sources: Britannica Money on Zillow’s published Zestimate error rates, the City of Acworth on mailing addresses and county lines, and school district data for ZIP code 30102.
This post is general information. Nicole France is a REALTOR® and Broker/Owner. The data discrepancies described were identified during community research and reflect what those sources published at the time of review. Automated valuation models, community profiles, and third-party property data change. Verify all information affecting a purchase decision with primary sources.
Nicole France is a REALTOR® with RE/MAX Center serving buyers and sellers across Acworth, Kennesaw, Dallas, Cartersville, and Woodstock. Client Focused · Results Driven.