Data coverage
We publish this because refusing to sell where the data cannot support the argument is a feature, not an apology.
We ingested 1,687,026 parcels across 30 assessment rolls in Utah and Washington, DC for 2026. Of those, 760,347 homes in 12 jurisdictions carry enough detail for a defensible comparison. We do not offer an analysis in the remaining 18.
What a defensible comparison needs
To argue that a home is assessed above comparable properties, four things have to be present on the same parcel record:
- An assessed market value. Ideally before exemptions, so homes with different exemption status can be compared like for like.
- Building square footage. Without it there is no way to express value per unit of house, and a large home cannot be compared with a small one.
- A cohort key — a recorded subdivision, or where the assessor works in neighbourhoods, the assessor's neighbourhood code. It defines which homes count as comparable. A tax district is not a substitute: those average over a thousand parcels and describe a levy boundary rather than a neighbourhood.
- A residential property class, so warehouses and farms stay out of a housing comparison.
A roll is published when at least 2,000 of its parcels carry all four, and they make up at least 25% of it. Both thresholds are judgement calls; both are deliberately strict.
Utah
Counties we analyse (11)
"Homes analysed" counts parcels that carry all four fields and sit in a cohort with enough comparable homes to compute a median.
| County | Parcels | Homes analysed | Share | Roll vintage |
|---|---|---|---|---|
| Salt Lake County | 393,521 | 287,749 | 73.1% | 26 March 2026 |
| Utah County | 263,742 | 108,238 | 41.0% | 30 October 2025 |
| Washington County | 110,255 | 74,125 | 67.2% | 23 October 2025 |
| Weber County | 108,304 | 66,663 | 61.6% | 29 October 2025 |
| Tooele County | 33,861 | 22,435 | 66.3% | 23 October 2025 |
| Iron County | 49,596 | 15,708 | 31.7% | 18 July 2024 |
| Wasatch County | 30,290 | 14,543 | 48.0% | 31 October 2024 |
| Sevier County | 19,556 | 6,408 | 32.8% | 23 October 2025 |
| Kane County | 16,899 | 5,899 | 34.9% | 23 October 2025 |
| Morgan County | 8,368 | 2,555 | 30.5% | 23 October 2025 |
| Grand County | 7,611 | 1,977 | 26.0% | 23 October 2025 |
Counties we do not analyse (18)
Every exclusion below is a measured property of the county's own published roll, not a commercial decision.
- Davis County122,096 parcels · roll 26 November 2025
This county's roll publishes no way to group comparable homes, publishes building square footage for only 45% of parcels and carries an assessed value for only 45% of parcels, so there is no defensible way to compare a home against its neighbours.
- Cache County58,709 parcels · roll 23 October 2025
This county's roll publishes no way to group comparable homes, so there is no defensible way to compare a home against its neighbours.
- Box Elder County46,675 parcels · roll 17 July 2020
This county's roll publishes no way to group comparable homes, publishes building square footage for only 35% of parcels and carries an assessed value for only 47% of parcels, so there is no defensible way to compare a home against its neighbours.
- Summit County34,102 parcels · roll 26 November 2025
This county's roll publishes no building square footage, so there is no defensible way to compare a home against its neighbours.
- Duchesne County32,098 parcels · roll 23 October 2025
This county's roll publishes building square footage for only 33% of parcels and carries an assessed value for only 43% of parcels, so there is no defensible way to compare a home against its neighbours.
- Uintah County21,598 parcels · roll 23 October 2025
This county's roll publishes no way to group comparable homes and publishes building square footage for only 52% of parcels, so there is no defensible way to compare a home against its neighbours.
- Millard County17,499 parcels · roll 23 October 2025
This county's roll publishes a subdivision or neighborhood for only 34% of parcels, publishes building square footage for only 35% of parcels and carries an assessed value for only 54% of parcels, so there is no defensible way to compare a home against its neighbours.
- Carbon County16,004 parcels · roll 26 November 2025
This county's roll publishes a subdivision or neighborhood for only 18% of parcels, publishes building square footage for only 20% of parcels and carries an assessed value for only 29% of parcels, so there is no defensible way to compare a home against its neighbours.
- Sanpete County11,434 parcels · roll 23 October 2025
This county's roll publishes no way to group comparable homes, publishes building square footage for only 8% of parcels and carries an assessed value for only 12% of parcels, so there is no defensible way to compare a home against its neighbours.
- Juab County10,980 parcels · roll 26 November 2025
This county's roll publishes no way to group comparable homes and publishes building square footage for only 33% of parcels, so there is no defensible way to compare a home against its neighbours.
- Emery County10,693 parcels · roll 17 July 2024
This county's roll publishes a subdivision or neighborhood for only 35% of parcels, publishes building square footage for only 41% of parcels, carries an assessed value for only 42% of parcels and publishes no residential property class, so there is no defensible way to compare a home against its neighbours.
- Garfield County10,457 parcels · roll 23 October 2025
This county's roll publishes building square footage for only 34% of parcels and carries an assessed value for only 56% of parcels, so there is no defensible way to compare a home against its neighbours.
- Rich County10,169 parcels · roll 29 October 2025
This county's roll publishes no way to group comparable homes and publishes building square footage for only 31% of parcels, so there is no defensible way to compare a home against its neighbours.
- Beaver County8,712 parcels · roll 23 October 2025
This county's roll publishes building square footage for only 39% of parcels and carries an assessed value for only 54% of parcels, so there is no defensible way to compare a home against its neighbours.
- San Juan County8,385 parcels · roll 23 July 2024
This county's roll publishes no way to group comparable homes, publishes building square footage for only 33% of parcels, carries an assessed value for only 58% of parcels and publishes no residential property class, so there is no defensible way to compare a home against its neighbours.
- Wayne County3,425 parcels · roll 23 October 2025
This county's roll publishes building square footage for only 55% of parcels, so there is no defensible way to compare a home against its neighbours.
- Daggett County3,201 parcels · roll 17 July 2024
This county's roll publishes building square footage for only 38% of parcels and carries an assessed value for only 52% of parcels, so there is no defensible way to compare a home against its neighbours.
- Piute County2,873 parcels · roll 26 November 2025
This county's roll publishes a subdivision or neighborhood for only 27% of parcels, publishes building square footage for only 40% of parcels and carries an assessed value for only 56% of parcels, so there is no defensible way to compare a home against its neighbours.
Worth knowing
- Summit County publishes no building square footage at all, for any parcel. Value per square foot cannot be computed there, so no comparison is possible regardless of how good the rest of the record is.
- Davis County is Utah's second most populous and publishes no subdivision names, which removes the cohort key. Good values and square footage are not enough on their own.
- Box Elder County last published its roll in 2020 — five years stale. Even where fields are present, we will not compare a home against values that old.
Washington, DC
One roll of 215,913 parcels, of which 154,047 (71.3%) carry enough detail for a comparison. Roll vintage 16 September 2026.
Coverage is re-measured on every ingest, so a jurisdiction can move between these lists when its assessor changes what it publishes. Source data is each jurisdiction's own published assessment roll; the exact dataset is cited on that jurisdiction's page. See the method for how the comparison itself is computed.