Williamson County property record for 3605 Cornerstone St, Round Rock, TX 78681
| Property Type | Single Family Home |
|---|---|
| Details | 2 ba · 1,133 sqft · built 1982 |
| Lot Size | 0.196 acres (8,543 sqft) |
| Owner | Individual Name on File |
| Tax Bill | $1,927 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | R-16-3466-0015-0010 |
| Primary APN | R-16-3466-0015-0010 |
|---|---|
| Alternative APNs |
|
| Full Baths | 2 Baths |
|---|---|
| Stories | 1 Story |
| Building Area | 1,133 sqft Living Area |
| 1st Floor Area | 1,133 sqft |
| Flooring | Carpet |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1982 |
|---|---|
| Effective Year Built | Effective 1982 |
| Exterior Material | Wood |
| Roof Type | Gable |
| Lot Area | 8,543 sqft (0.196 acres) |
| Garage Area | 494 sqft |
| Parking Spaces | 2 Parking Spaces |
| Porch | Open Porch |
| Porch Area | 24 sqft |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Heating Fuel | Gas |
| Sewer | Connected |
| Account Number | R16346600150010 |
|---|---|
| Street Address | 3605 CORNERSTONE ST |
| City | ROUND ROCK |
| State | TX |
| Zip | 78681-3708 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | S3261 - BRUSHY CREEK SEC 2, BLOCK 15, LOT 10 |
| Legal Subdivision | BRUSHY CREEK SEC 2 |
| Legal Block | 15 |
| Legal Lot Number | 10 |
| Jurisdiction | WILLIAMSON TX |
| Township / Civil Division | ROUND ROCK-GEORGETOWN |
| Census Block Group | 1 |
| Census Block | 1002 |
| Census Tract | 20515 |
3605 Cornerstone St is owned and occupied by an individual.
Source: Williamson County records, as of September 11, 2026
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 3605 CORNERSTONE ST, ROUND ROCK, TX 78681-3708 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | Name on Deed |
|---|---|
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 3605 Cornerstone St was $1,927 with a homeowner's exemption.
Source: Williamson County assessment roll, as of September 11, 2026
| Type | Name |
|---|---|
| State | Texas |
| County | Williamson County |
| Unified School District | Round Rock Independent School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2025 | $1,927.00 Homeowner's exemption Senior Citizen's exemption | $260,085 Land $71,500 Building $188,585 | $260,085 Land $71,500 Building $188,585 |
| 2023 | $1,804.00 (-36.83%) Homeowner's exemption Senior Citizen's exemption | $310,269 Land $83,000 Building $227,269 | $310,269 Land $83,000 Building $227,269 |
| 2022 | $2,856.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 3605 Cornerstone St in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective October 5, 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
Values are read at the parcel center point; lenders make the official flood determination.
Wildfire risk around 3605 Cornerstone St is low, with less than a 0.01% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 99.8% of the US · lower than 99.8% of Texas |
|---|---|
| Wildfire Likelihood | Under 0.01% annual chance |
| Exposure | None beyond ember reach |
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | BRUSHY CREEK MUD serves 18,314 people · EPA ID TX2460061 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | May 2025 |
| Lead | 1 ppb (2023–2025) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | None last 3 years |
Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes. This system sells water to local utilities; the supplier billing this address may be one of them.
Source: FCC Broadband Data Collection, based on 794 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber · DSL · Fixed Wireless in parts of the area | 5,000 / 5,000 |
| Spectrum Cable | 1,000 / 1,000 |
| Verizon Fixed Wireless | 300 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: SOS Communications, VTX Communications, Western Broadband.
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