- Parcels
- 282,571
- County FIPS
- 48491
- Snapshot
- October 30, 2026
What property data is available for Williamson County?
| Dataset | Williamson County |
|---|---|
| Parcel boundaries | 282,571 parcels |
| Tax assessor records | 284,827 records (100% of parcels) |
| Owner name and mailing address | 100% of assessor records |
| Market or assessed value | 93% of assessor records |
| Year built | 0% of assessor records |
| Last sale date | 0% of assessor records |
| Building permits | 177,185 permits since 2015, latest October 28, 2026 |
| Roofing permits | 11,165 |
| Zoning | 8 zoning jurisdictions |
| Buildable-area screens | Yes |
| Historic designations | 74 |
| Adopted building codes | 5 jurisdictions |
| Hail history (radar) | Yes, every county in the contiguous US |
How do I query Williamson County property data?
Bulk-search every parcel in the county with `search_properties` using `state: "TX"` and `county: "491"` (the county FIPS code 48491), or look up one address with `search_parcels`. Check any single property for free with `check_availability`.
{
"name": "count_properties",
"arguments": { "state": "TX", "county": "491" }
}Frequently asked questions
How do I find who owns a property in Williamson County?
Search the address on the Williamson County assessor's website, or query Parceled's `search_parcels` for owner name and mailing address. See how to find a property owner by address.