Data Coverage and Zestimate® Accuracy
The home data we have compiled to generate a Zestimate home valuation varies by location. Some counties provide all the data we could hope for, but others are lacking such key things as the number of bedrooms and bathrooms, or, in some cases, the square footage of the home. The more data we have, the more accurate the Zestimate. And, we've made it easier for our users to help us improve accuracy by incorporating edited home facts into our Zestimate calculations. In some areas, we might not be able to produce a Zestimate at all, but we do have some basic information on the homes. The tables below show you where we have Zestimates and other home information.
To measure the accuracy of the Zestimates, we've gone back in time and compared the historic Zestimates with the actual transaction prices of homes that sold. The tables below also provide various measures of that accuracy.
What's a Zestimate?
A Zestimate home valuation is Zillow's estimated market value. It is not an appraisal. Use it as a starting point to determine a home's value. Learn more.
- Virginia Counties
Virginia
| County | Zestimate Accuracy | % Homes on Zillow | % Homes With Zestimates | Within 5% of Sale price | Within 10% of Sale Price | Within 20% of Sale Price | Median Error |
|---|---|---|---|---|---|---|---|
| Albemarle | One Stars | 99% | 0% | -- | -- | -- | -- |
| Amherst | One Stars | 99% | 0% | -- | -- | -- | -- |
| Arlington | Four Stars | 93% | 93% | 45% | 69% | 87% | 5.9% |
| Bedford | One Stars | 73% | 0% | -- | -- | -- | -- |
| Campbell | One Stars | 27% | 0% | -- | -- | -- | -- |
| Caroline | Two Stars | 99% | 99% | 26% | 45% | 65% | 12.2% |
| Charles City | One Stars | 99% | 0% | -- | -- | -- | -- |
| Chesterfield | Four Stars | 99% | 99% | 36% | 63% | 83% | 7.2% |
| Clarke | One Stars | 84% | 0% | -- | -- | -- | -- |
| Culpeper | Two Stars | 99% | 99% | 20% | 37% | 64% | 13.9% |
| Fairfax | Four Stars | 78% | 77% | 36% | 61% | 85% | 7.6% |
| Fauquier | Four Stars | 99% | 99% | 33% | 55% | 77% | 8.7% |
| Fluvanna | One Stars | 99% | 0% | -- | -- | -- | -- |
| Frederick | Four Stars | 94% | 76% | 29% | 56% | 77% | 9.0% |
| Gloucester | One Stars | 58% | 0% | -- | -- | -- | -- |
| Goochland | One Stars | 99% | 0% | -- | -- | -- | -- |
| Hanover | Four Stars | 99% | 99% | 40% | 63% | 82% | 6.6% |
| Henrico | Four Stars | 96% | 96% | 44% | 67% | 85% | 6.1% |
| Isle of Wight | One Stars | 91% | 0% | -- | -- | -- | -- |
| James City | Four Stars | 99% | 99% | 38% | 59% | 77% | 7.0% |
| King George | One Stars | 99% | 0% | -- | -- | -- | -- |
| Loudoun | Four Stars | 99% | 99% | 32% | 54% | 80% | 9.0% |
| Madison | One Stars | 44% | 0% | -- | -- | -- | -- |
| Mathews | One Stars | 18% | 0% | -- | -- | -- | -- |
| Montgomery | One Stars | 69% | 0% | -- | -- | -- | -- |
| New Kent | One Stars | 99% | 0% | -- | -- | -- | -- |
| Orange | Two Stars | 99% | 99% | 17% | 31% | 56% | 16.4% |
| Page | One Stars | 93% | 0% | -- | -- | -- | -- |
| Prince George | One Stars | 95% | 0% | -- | -- | -- | -- |
| Prince William | Two Stars | 90% | 86% | 26% | 45% | 71% | 11.4% |
| Rappahannock | One Stars | 99% | 0% | -- | -- | -- | -- |
| Roanoke | One Stars | 99% | 0% | -- | -- | -- | -- |
| Scott | One Stars | 30% | 0% | -- | -- | -- | -- |
| Shenandoah | One Stars | 99% | 0% | -- | -- | -- | -- |
| Spotsylvania | Three Stars | 99% | 99% | 29% | 48% | 71% | 10.4% |
| Stafford | Four Stars | 99% | 99% | 34% | 61% | 87% | 7.9% |
| Warren | One Stars | 99% | 0% | -- | -- | -- | -- |
| Washington | One Stars | 99% | 0% | -- | -- | -- | -- |
| York | Four Stars | 90% | 90% | 49% | 72% | 86% | 5.1% |
| Alexandria City | Four Stars | 96% | 96% | 43% | 68% | 84% | 5.8% |
| Bristol City | One Stars | 99% | 0% | -- | -- | -- | -- |
| Charlottesville City | One Stars | 99% | 0% | -- | -- | -- | -- |
| Chesapeake City | Four Stars | 98% | 98% | 50% | 72% | 85% | 5.1% |
| Colonial Heights City | One Stars | 87% | 0% | -- | -- | -- | -- |
| Danville City | One Stars | 61% | 0% | -- | -- | -- | -- |
| Fairfax City | One Stars | 87% | 0% | -- | -- | -- | -- |
| Falls Church City | One Stars | 95% | 0% | -- | -- | -- | -- |
| Fredericksburg City | Three Stars | 99% | 99% | 27% | 47% | 75% | 10.6% |
| Hampton City | Four Stars | 92% | 92% | 37% | 63% | 83% | 6.9% |
| Hopewell City | One Stars | 99% | 0% | -- | -- | -- | -- |
| Lynchburg City | One Stars | 99% | 0% | -- | -- | -- | -- |
| Manassas City | Four Stars | 91% | 90% | 35% | 57% | 81% | 8.0% |
| Manassas Park City | Three Stars | 99% | 99% | 27% | 48% | 74% | 10.3% |
| Newport News City | Four Stars | 99% | 99% | 45% | 66% | 82% | 6.0% |
| Norfolk City | Three Stars | 99% | 99% | 26% | 47% | 73% | 10.4% |
| Petersburg City | One Stars | 63% | 0% | -- | -- | -- | -- |
| Portsmouth City | Four Stars | 93% | 91% | 31% | 57% | 80% | 8.4% |
| Richmond City | Two Stars | 99% | 99% | 23% | 44% | 69% | 11.8% |
| Roanoke City | One Stars | 99% | 0% | -- | -- | -- | -- |
| Salem City | One Stars | 92% | 0% | -- | -- | -- | -- |
| Suffolk City | One Stars | 99% | 0% | -- | -- | -- | -- |
| Virginia Beach City | Four Stars | 97% | 94% | 38% | 57% | 75% | 7.9% |
| Williamsburg City | One Stars | 99% | 0% | -- | -- | -- | -- |
| Winchester City | One Stars | 92% | 0% | -- | -- | -- | -- |
Last updated: June 4, 2008
Note: Zestimate accuracy is computed by comparing the final sale price to the Zestimate on or before the sale date. The data herein is computed for the three-month period ending Dec. 31, 2007.
Click here to download an Excel spreadsheet of this data.
Definitions
- Zestimate Accuracy/Star Rating:
- This rating is tied to the Median Error in an area.
The ratings are as follows:
= Best Zestimate
= Good Zestimate
= Fair Zestimate
= Tax assessor's value, or unable to compute Zestimate accuracy- 0 stars = No valuation
- Tax Assessor's Value
-
Depending on the jurisdiction where you live, this value could be the tax assessed, tax appraised, or market assessed value. This value comes from the taxing authority of the city, county or state where you live; this is not Zillow's value.
Note: Tax assessor's values differ from Zillow's Zestimate, which is computed by entering numerous data points into a proprietary formula, often resulting in a more accurate value estimate.
- Homes on Zillow:
- This indicates the percentage of homes for which we have data (e.g., number of bedrooms or bathrooms) in a particular locale. These are the homes you can find via maps or search on Zillow.com.
- Homes With Zestimates:
- We can only calculate Zestimates for homes where we have certain data, including transactions. This column indicates the percentage of homes in an area with Zestimates.
- Within 5% of Sale Price:
- This is the percentage of transactions in a location for which the Zestimate was within 5% of the transaction price. For example, in the Portland area, 35% of the time the Zestimate was within 5% of the selling price.
- Within 10% of Sale Price:
- This is the percentage of transactions in a location for which the Zestimate was within 10% of the transaction price.
- Within 20% of Sale Price:
- This is the percentage of transactions in a location for which the Zestimate was within 20% of the transaction price.
- Median Error:
- Half of the Zestimates in an area were closer than the error percentage and half were farther off. For example, in Seattle, Zestimates for half of the homes are within 7.5% of the selling price, and half are off by more than 7.5%.
