San Mateo County property record for 430 Wisnom Ave, San Mateo, CA 94401
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2 ba · 1,540 sqft · built 1923 |
| Lot Size | 0.11 acres (4,800 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $1,800,000 (Jun 2021) |
| Tax Bill | $19,974 (2025) |
| Deeds & Mortgages | Aug 2022 Line of Credit Jun 2021 Sale & Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 032-172-240 |
| Primary APN | 032-172-240 |
|---|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 7 Rooms |
| Stories | 1 Story |
| Building Area | 1,540 sqft Living Area |
| 1st Floor Area | 1,260 sqft |
| Family Room | Family Room |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1923 |
|---|---|
| Effective Year Built | Effective 1923 |
| Architectural Style | Ranch |
| Exterior Material | Wood |
| Construction Type | Wood |
| Roof Material | Composition Shingle |
| Lot Area | 4,800 sqft (0.11 acres) |
| Lot Dimensions | 120 ft deep x 40 ft wide |
| Garage Area | 320 sqft |
| Parking Spaces | 1 Parking Space |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 430 WISNOM AVE |
|---|---|
| City | SAN MATEO |
| State | CA |
| Zip | 94401-2422 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R20000 |
| Legal Description | LOT 9 WISNOM SUB OF POR OF BLOCK 8 WESTERN ADD TO SAN MATEO RSM A/33 |
| Legal Subdivision | WESTERN ADD TO SAN MATEO |
| Legal Block | 8 |
| Legal Lot Number | 9 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 3 |
| Census Block | 3005 |
| Census Tract | 605901 |
430 Wisnom Ave is owned and occupied by two individuals who bought it in June 2021.
Source: San Mateo County records, as of July 15, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 430 WISNOM AVE, SAN MATEO, CA 94401-2422 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Community Property |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Date | Document |
|---|---|
| Aug 23, 2022 | Deed of Trust, Mortgage · Line of Credit PENTAGON FCU |
| Jun 7, 2021 | Grant Deed, Transfer · Conventional Mortgage GUARANTEED RATE INC |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Jun 7, 2021 · Amount on File |
| Deed Sale | Jun 7, 2021 · Amount on File |
| Prior Sale | Nov 26, 2013 · Amount on File |
| Deed Document Number | 202187569 |
| Prior Transfer Date | Nov 23, 2009 |
| Prior Transfer Doc | 0000156814 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Property Address | 430 WISNOM AVE, SAN MATEO, CA 94401-2422 |
| Transaction Type | Mortgage |
| Record Updated | Sep 19, 2022 |
| Name | Verified Name |
|---|---|
| Address | 430 WILSNOM AVE, SAN MATEO, CA 94401-2422 |
| Document Number | 0000062505 |
|---|---|
| Date | Aug 23, 2022 |
| Instrument | 2022-062505 |
| Name | PENTAGON FCU |
|---|---|
| Type | Credit Union |
| Address | 22120 |
| Type | Line of Credit |
|---|---|
| Amount | Amount on Record |
| Term | 360 Months |
| Due | Aug 28, 2052 |
| Rate Type | Adjustable Rate |
|---|---|
| Change Frequency | Monthly |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Jun 7, 2021 |
| Property Address | 430 WISNOM AVE, SAN MATEO, CA 94401-2422 |
| Document Number | 0000087569 |
| Map Reference | MB A PG 33 |
| Instrument Date | May 26, 2021 |
| Instrument | 2021-087569 |
| Transaction Type | Transfer |
| Record Updated | Jun 24, 2021 |
| Title Company | LAWYERS TITLE COMPANY/CA, LAWYERS TITLE COMPANY |
| Amount | Amount on Record |
|---|---|
| Downpayment | Downpayment on Record |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $10,980.00 |
| Amount Accuracy | Rounded by County |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Community Property with Right of Survivorship |
| Address | 430 WISNOM AVE, SAN MATEO, CA 94401-2422 |
| Document Number | 0000087570 |
|---|---|
| Date | Jun 7, 2021 |
| Instrument | 2021-087570 |
| Name | GUARANTEED RATE INC |
|---|---|
| Type | Mortgage Company |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | Jul 1, 2051 |
The 2025 property tax bill for 430 Wisnom Ave was $19,974.
Source: San Mateo County assessment roll, as of July 15, 2026
| Type | Name |
|---|---|
| State | California |
| County | San Mateo County |
| Municipality | San Mateo City |
| Elementary School District | San Mateo-Foster City Elementary School District (KG - 08) |
| Secondary School District | San Mateo Union High School District (09 - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $1,685,000 (+5.31%) Land $1,029,500 Building $655,500 | ||
| 2025 | $19,974.00 | $1,600,000 Land $977,500 Building $622,500 | |
| 2023 | $17,591.00 (-23.24%) | $1,400,000 Land $856,000 Building $544,000 | $1,427,220 |
| 2022 | $22,917.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 430 Wisnom Ave in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective September 10, 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.
The area around 430 Wisnom Ave has no burnable land within ember reach, so its wildfire risk is not rated.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Not rated no burnable land within 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 | CALIFORNIA WATER SERVICE - SAN MATEO private · serves 103,536 people · EPA ID CA4110008 |
|---|---|
| Water Source | Purchased surface water from SAN FRANCISCO REGIONAL WATER SYSTEM |
| Last State Inspection | Mar 2025 |
| Lead | 4 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.
Source: FCC Broadband Data Collection, based on 713 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber · Fixed Wireless, DSL in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Astound Broadband Cable | 1,500 / 50 |
| Sonic Telecom Fiber | 1,000 / 1,000 |
| Etheric Networks Fixed Wireless | 250 / 100 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: GeoLinks, Verizon.
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