Marin County property record for 251 Marion Ave, Mill Valley, CA 94941
| Property Type | Duplex |
|---|---|
| Details | 4 bd · 2 ba · 2,630 sqft · built 1907 |
| Lot Size | 1.03 acres (44,867 sqft) |
| Owner | Company Name on File |
| Last Sale | $234,000 (Jun 2013) |
| Tax Bill | $10,052 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 028-092-08 |
| Primary APN | 028-092-08 |
|---|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2 Baths |
| Units | 2 Units |
| Building Area | 2,630 sqft Living Area |
| Basement Area | 176 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1907 |
|---|---|
| Effective Year Built | Effective 1930 |
| Architectural Style | Duplex Single |
| Lot Area | 44,867 sqft |
| Deck Area | 150 sqft |
| Patio Area | 150 sqft |
| Heating System | Central |
|---|
| Street Address | 251 MARION AVE |
|---|---|
| City | MILL VALLEY |
| State | CA |
| Zip | 94941-2604 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Duplex |
| Legal Description | MAP C3 606 |
| Legal Subdivision | TAMALPAIS LAND & WATER CO |
| Legal Lot Number | 194 |
| Jurisdiction | MARIN CA |
| Township / Civil Division | SOUTHEAST MARIN |
| Census Block Group | 3 |
| Census Block | 3003 |
| Census Tract | 127000 |
Source: NPS National Register of Historic Places, as of August 1, 2026
| Listed Area | Within Dipsea Trail, The listed 2010 · 1 contributing resources · NRIS 10000356 |
|---|
Federal listing alone does not restrict alterations; local historic district rules, which this data does not cover, may apply.
251 Marion Ave, a duplex, is owned by a company that bought it in June 2013.
Source: Marin County records, as of August 6, 2026
| Owner of Record | Company Name on File |
|---|---|
| Mailing Address | PO BOX 192, STINSON BEACH, CA 94970-0192 |
| Owner Type | Company |
| Vesting | Company |
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 | Jun 17, 2013 · Amount on File |
| Deed Sale | Jun 17, 2013 · Amount on File |
| Deed Document Number | 201341392 |
| Record Updated | Sep 20, 2026 |
The 2025 property tax bill for 251 Marion Ave was $10,052.
Source: Marin County assessment roll, as of July 13, 2026
| Type | Name |
|---|---|
| State | California |
| County | Marin County |
| Municipality | Mill Valley City |
| 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 | $393,931 (+2%) Land $295,516 Building $98,415 | |
| 2025 | $10,052.00 | $386,208 Land $289,723 Building $96,485 |
| 2023 | $9,897.00 (+3.14%) | $371,213 Land $278,474 Building $92,739 |
| 2022 | $9,596.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 251 Marion Ave in Zone X, an area of minimal flood risk, within 500 ft of a high-risk flood zone.
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 |
|---|---|
| Nearest Special Flood Hazard Area | Zone AE, within 500 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 5 in force |
| Nearby Flood Claims | 4 (1982–1998) |
| Claims Outside the SFHA | 3 of 4 |
| Most Recent Claim | Jan 1998 · rainfall accumulation |
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 251 Marion Ave is low, with a 0.04% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 65% of the US · lower than 79% of California |
|---|---|
| Wildfire Likelihood | 0.04% annual chance |
| Exposure | Direct burnable vegetation |
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 340 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber · DSL in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
May also be available: Unwired, Verizon.
5G (outdoors only) and 4G LTE
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