Marin County property record for 303 Sheffield Ave, Mill Valley, CA 94941
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 3 ba · 1,976 sqft · built 1971 |
| Lot Size | 0.165 acres (7,200 sqft) |
| Owner | Individual Name on File |
| Last Sale | $368,000 (May 2001) |
| Tax Bill | $17,522 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 050-131-05 |
| Primary APN | 050-131-05 |
|---|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 6 Rooms |
| Building Area | 1,976 sqft Living Area |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1971 |
|---|---|
| Effective Year Built | Effective 1972 |
| Architectural Style | Contemporary |
| Exterior Material | Wood Siding |
| Roof Material | Wood Shingle |
| Lot Area | 7,200 sqft (0.165 acres) |
| Pool Type | Spa / Hot Tub (No Pool) |
| Deck Area | 418 sqft |
| Patio Area | 418 sqft |
| Heating System | Central |
|---|---|
| Heating Fuel | Gas |
| Sewer | Municipal |
| Water Source | Commercial |
| Street Address | 303 SHEFFIELD AVE |
|---|---|
| City | MILL VALLEY |
| State | CA |
| Zip | 94941-3860 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1 |
| Legal Description | L3-5 B3 /B4P99 M #B MARIN HEIGHTS |
| Legal Subdivision | MARIN HEIGHTS B |
| Legal Block | 3 |
| Legal Lot Number | 3,4 |
| Jurisdiction | MARIN CA |
| Township / Civil Division | SOUTHEAST MARIN |
| Census Block Group | 1 |
| Census Block | 1004 |
| Census Tract | 128100 |
303 Sheffield Ave is owned and occupied by an individual who bought it in May 2001.
Source: Marin County records, as of July 13, 2026
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 303 SHEFFIELD AVE, MILL VALLEY, CA 94941-3860 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
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 | Name on Deed |
|---|---|
| Last Sale | May 1, 2001 · Amount on File |
| Deed Sale | May 1, 2001 · Amount on File |
| Prior Sale | Jan 8, 1998 · Amount on File |
| Deed Document Number | 200124088 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 303 Sheffield Ave was $17,522 with a homeowner's exemption.
Source: Marin County assessment roll, as of July 13, 2026
| Type | Name |
|---|---|
| State | California |
| County | Marin County |
| Elementary School District | Mill Valley Elementary School District (KG - 08) |
| Secondary School District | Tamalpais Union High School District (09 - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $906,102 (+2%) Land $478,839 Building $427,263 | |
| 2025 | $17,522.00 Homeowner's exemption | $888,337 Land $469,450 Building $418,887 |
| 2023 | $16,482.00 (+3.43%) Homeowner's exemption | $853,846 Land $451,224 Building $402,622 |
| 2022 | $15,936.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 303 Sheffield Ave in Zone X, an area of minimal flood risk, though there have been 4 flood claims nearby since 1982.
Source: FEMA National Flood Hazard Layer, effective October 18, 2023 · 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 |
| Community Rating System | Class 6 (20% premium discount) |
| Nearby Flood Policies | 4 in force |
| Nearby Flood Claims | 4 (1982–1998) |
| Claims Outside the SFHA | 4 of 4 |
| Most Recent Claim | Apr 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.
Wildfire risk around 303 Sheffield Ave is low, with a 0.02% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 80% of the US · lower than 88% of California |
|---|---|
| Wildfire Likelihood | 0.02% 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 | MARIN MUNICIPAL WATER DISTRICT serves 188,116 people · EPA ID CA2110002 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Aug 2023 |
| Lead | Under 1 ppb (2019–2021) 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 707 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber · DSL | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Unwired Fixed Wireless | 300 / 25 |
May also be available: T-Mobile, Verizon.
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