Travis County property record for 5104 Portmarnock Ct, Austin, TX 78747
| Property Type | Single Family Home |
|---|---|
| Details | 3 ba · 3,123 sqft · built 1996 |
| Lot Size | 0.331 acres (14,427 sqft) |
| Owner | 2 Owner Names on File |
| Last Sale | $345,000 (Dec 2006) |
| Tax Bill | $5,173 (2024) |
| Flood Zone | Zone X (minimal risk) |
| APN | 0443070403 |
| Primary APN | 0443070403 |
|---|---|
| Alternative APNs |
|
| Full Baths | 3 Baths |
|---|---|
| Stories | 1 Story |
| Building Area | 3,123 sqft Living Area |
| Gross Area | 3,564 sqft |
| 1st Floor Area | 3,123 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1996 |
|---|---|
| Construction Type | Wood Frame |
| Foundation Type | Slab (Mat/Raft) |
| Roof Type | Hip |
| Roof Material | Composition Shingle |
| Lot Area | 14,427 sqft (0.331 acres) |
| Garage Type | Attached |
| Garage Area | 441 sqft |
| Parking Spaces | 2 Parking Spaces |
| Porch | Open Porch |
|---|---|
| Porch Area | 40 sqft |
| Patio Area | 619 sqft |
| Fence | Fence |
| Cooling System | HVAC |
|---|---|
| Heating System | HVAC |
| Account Number | 373912 |
|---|---|
| Old Parcel Number | 04430704030000 |
| Street Address | 5104 PORTMARNOCK CT |
| City | AUSTIN |
| State | TX |
| Zip | 78747-1466 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 18 BLK C ONION CREEK ADDN |
| Legal Subdivision | ONION CREEK ADDN |
| Legal Block | C |
| Legal Lot Number | 18 |
| Jurisdiction | TRAVIS TX |
| Township / Civil Division | AUSTIN |
| Census Block Group | 1 |
| Census Block | 1002 |
| Census Tract | 2446 |
The current owner of 5104 Portmarnock Ct bought it in December 2006.
Source: Travis County records, as of November 3, 2025
| Owner of Record | 2 Owner Names on File |
|---|---|
| Mailing Address | 5104 PORTMARNOCK CT, AUSTIN, TX 78747-1466 |
| Occupancy | Owner Occupied |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Dec 6, 2006 · Amount on File |
| Deed Sale | Dec 6, 2006 · Amount on File |
| Prior Sale | Sep 9, 1996 |
| Deed Document Number | 2006233863 |
| Record Updated | Jun 8, 2026 |
Source: Travis County assessment roll, as of August 1, 2025
| Type | Name |
|---|---|
| State | Texas |
| Municipality | Austin City |
| County | Travis County |
| Unified School District | Austin Independent School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2025 | $693,934 Land $80,603 Building $689,561 | $770,164 Land $80,603 Building $689,561 | |
| 2024 | $5,173.00 | ||
| 2023 | $736,221 Land $79,200 Building $657,021 | $736,221 Land $79,200 Building $657,021 | |
| 2022 | $6,634.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 5104 Portmarnock Ct in Zone X, an area of minimal flood risk, though there have been 2 flood claims nearby since 2015.
Source: FEMA National Flood Hazard Layer, effective May 17, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Flood Insurance Cost | Premium on File median of 94 individual policies |
| Community Rating System | Class 5 (25% premium discount) |
| Nearby Flood Policies | 106 units insured incl. 12 condo units |
| Nearby Flood Claims | 2 (2015) |
| Claims Outside the SFHA | 1 of 2 |
| Most Recent Claim | Oct 2015 · Severe Storms, Tornadoes, Straight-line Winds, And Flooding |
| Claims by Event |
|
Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.
Wildfire risk around 5104 Portmarnock Ct is low, with a 0.05% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 66% of the US · lower than 90% of Texas |
|---|---|
| Wildfire Likelihood | 0.05% annual chance |
| Exposure | Indirect within ember reach |
| Adjoins Burnable Land | Yes |
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 | CITY OF AUSTIN WATER & WASTEWATER serves 1,115,323 people · EPA ID TX2270001 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Jul 2023 |
| Lead | Under 1 ppb (2022–2024) action level 15 ppb |
| Water Quality | Turbidity resolved · Feb 2022 |
|---|---|
| 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 230 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Google Fiber Fiber | 8,000 / 8,000 |
| AT&T Fiber | 5,000 / 5,000 |
| Spectrum Cable | 1,000 / 1,000 |
| Verizon Fixed Wireless | 300 / 20 |
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