San Mateo County property record for 415 42nd Ave, San Mateo, CA 94403
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2 ba · 2,380 sqft · built 1953 |
| Lot Size | 0.131 acres (5,709 sqft) |
| Owner | 2 Individual Names on Record |
| Tax Bill | $4,615 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 042-211-030 |
| Primary APN | 042-211-030 |
|---|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 8 Rooms |
| Building Area | 2,380 sqft Living Area |
| 1st Floor Area | 1,210 sqft |
| Family Room | Family Room |
| Year Built | Built 1953 |
|---|---|
| Effective Year Built | Effective 1953 |
| Lot Area | 5,709 sqft (0.131 acres) |
| Lot Dimensions | 96 ft deep x 59 ft wide |
| Garage Area | 410 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 415 42ND AVE |
|---|---|
| City | SAN MATEO |
| State | CA |
| Zip | 94403-5005 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R10006 |
| Legal Description | LOT 10 BLOCK 29 SAN MATEO KNOLLS MAP NO 4 RSM 31/28 29 30 CITY OF SAN MATEO |
| Legal Subdivision | SAN MATEO KNOLLS MAP NO 4 |
| Legal Block | 29 |
| Legal Lot Number | 10 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 2 |
| Census Block | 2010 |
| Census Tract | 607100 |
Source: San Mateo County records, as of July 15, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | 2 Individual Names on Record |
|---|---|
| Mailing Address | 415 42ND AVE, SAN MATEO, CA 94403-5005 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | 2 Names on Deed |
|---|---|
| Record Updated | Sep 20, 2026 |
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 | $264,476 (+2%) Land $47,105 Building $217,371 | ||
| 2025 | $4,615.00 (+12.15%) Homeowner's exemption | $259,291 (+4.04%) Land $46,182 Building $213,109 | |
| 2023 | $4,115.00 (-2.07%) Homeowner's exemption | $249,225 Land $44,390 Building $204,835 | $2,076,480 |
| 2022 | $4,202.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
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.
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 891 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Sonic Telecom Fiber | 10,000 / 10,000 |
| AT&T Fiber · Fixed Wireless in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Etheric Networks Fixed Wireless | 250 / 100 |
May also be available: Astound Broadband, T-Mobile, Verizon.
Search by:
By searching, you agree to: Terms • Privacy • Disclosures