Marin County property record for 517 Northern Ave, Mill Valley, CA 94941
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2.5 ba · 2,539 sqft · built 1918 |
| Lot Size | 0.459 acres (20,000 sqft) |
| Owner | 2 Individual Names on File |
| Tax Bill | $9,590 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 049-101-06 |
| Primary APN | 049-101-06 |
|---|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Building Area | 2,539 sqft Living Area |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1918 |
|---|---|
| Effective Year Built | Effective 1945 |
| Architectural Style | Contemporary |
| Lot Area | 20,000 sqft (0.459 acres) |
| Garage Area | 572 sqft |
| Parking Spaces | 2 Parking Spaces |
| Deck Area | 303 sqft |
| Patio Area | 303 sqft |
| Heating System | Central |
|---|
| Street Address | 517 NORTHERN AVE |
|---|---|
| City | MILL VALLEY |
| State | CA |
| Zip | 94941-3782 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | OFFICIAL RECS 5 PG 6 BLK 1 LOT 5 |
| Legal Subdivision | LITTLE CITY FARMS |
| Legal Block | 1 |
| Legal Lot Number | 5 |
| Jurisdiction | MARIN CA |
| Township / Civil Division | SOUTHEAST MARIN |
| Census Block Group | 2 |
| Census Block | 2009 |
| Census Tract | 128100 |
517 Northern Ave is owned and occupied by two individuals who acquired it in March 2009.
Source: Marin County records, as of July 13, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 517 NORTHERN AVE, MILL VALLEY, CA 94941-3782 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Tenants in Common |
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 | Mar 24, 2009 |
| Transfer Doc | 0000017339 |
| Record Updated | Sep 20, 2026 |
The 2025 property tax bill for 517 Northern Ave was $9,590 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 | $249,528 (+2%) Land $60,002 Building $189,526 | |
| 2025 | $9,590.00 Homeowner's exemption | $244,636 Land $58,826 Building $185,810 |
| 2023 | $8,843.00 (+2.9%) Homeowner's exemption | $235,137 Land $56,542 Building $178,595 |
| 2022 | $8,594.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 517 Northern Ave in Zone X, an area of minimal flood risk, though there have been 6 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 | 6 in force |
| Nearby Flood Claims | 6 (1982–2019) |
| Claims Outside the SFHA | 3 of 6 |
| Most Recent Claim | Feb 2019 · Severe Winter Storms, Flooding, Landslides, And Mudslides |
| Claims by Event |
|
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 517 Northern 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 66% of the US · lower than 80% of California |
|---|---|
| Wildfire Likelihood | 0.04% 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 496 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: T-Mobile, Unwired, Verizon.
5G and 4G LTE (outdoors only)
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