San Mateo County property record for 323 Sonora Dr, San Mateo, CA 94402
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2.5 ba · 2,330 sqft · built 1938 |
| Lot Size | 0.148 acres (6,450 sqft) |
| Owner | 2 Trust Names on File |
| Tax Bill | $3,963 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 034-222-080 |
| Primary APN | 034-222-080 |
|---|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 9 Rooms |
| Stories | 2 Stories |
| Building Area | 2,330 sqft Living Area |
| 1st Floor Area | 1,210 sqft |
| 2nd Floor Area | 770 sqft |
| Family Room | Family Room |
| Study | Study |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1938 |
|---|---|
| Effective Year Built | Effective 1938 |
| Lot Area | 6,450 sqft (0.148 acres) |
| Lot Dimensions | 107 ft deep x 60 ft wide |
| Garage Area | 240 sqft |
| Parking Spaces | 1 Parking Space |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 323 SONORA DR |
|---|---|
| City | SAN MATEO |
| State | CA |
| Zip | 94402-2339 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R10006 |
| Legal Description | LOT 6 BLOCK 16 ARAGON SUB NO 5 RSM 20/73 74 CITY OF SAN MATEO |
| Legal Subdivision | ARAGON SUB NO 5 |
| Legal Block | 16 |
| Legal Lot Number | 6 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 1 |
| Census Block | 1012 |
| Census Tract | 606500 |
323 Sonora Dr is owner-occupied and held in a trust since July 2003.
Source: San Mateo County records, as of October 19, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 323 SONORA DR, SAN MATEO, CA 94402-2339 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
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 Transfer Date | Jul 10, 2003 |
| Transfer Doc | 0000201182 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 323 Sonora Dr was $3,963 with a homeowner's exemption.
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 | $208,113 (+2%) Land $45,029 Building $163,084 | ||
| 2025 | $3,963.00 Homeowner's exemption | $204,034 Land $44,147 Building $159,887 | |
| 2023 | $3,246.00 (+0.09%) Homeowner's exemption | $196,113 Land $42,434 Building $153,679 | $2,716,200 |
| 2022 | $3,243.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 323 Sonora Dr in Zone X, an area of minimal flood risk, though there have been 2 flood claims nearby since 1979.
Source: FEMA National Flood Hazard Layer, effective September 10, 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 |
| Nearby Flood Policies | 2 in force |
| Nearby Flood Claims | 2 (1979–1998) |
| Claims Outside the SFHA | 1 of 2 |
| Most Recent Claim | Feb 1998 · Severe Winter Storms And Flooding |
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.
The area around 323 Sonora Dr 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 727 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber | 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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