Marin County property record for 21 Byron Cir, Mill Valley, CA 94941
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2.5 ba · 1,374 sqft · built 1975 |
| Lot Size | 0.028 acres (1,200 sqft) |
| Owner | Individual Name on Record |
| Last Sale | $795,000 (Nov 2019) |
| Tax Bill | $13,370 (2025) |
| Deeds & Mortgages | Nov 2019 Sale & Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 030-311-26 |
| Primary APN | 030-311-26 |
|---|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Building Area | 1,374 sqft Living Area |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1975 |
|---|---|
| Effective Year Built | Effective 1975 |
| Architectural Style | Colonial |
| Lot Area | 1,200 sqft (0.028 acres) |
| Deck Area | 99 sqft |
| Patio Area | 99 sqft |
| Heating System | Central |
|---|
| Street Address | 21 BYRON CIR |
|---|---|
| City | MILL VALLEY |
| State | CA |
| Zip | 94941-4627 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Subdivision | SHELTER RDG 03 |
| Legal Lot Number | 157 |
| Jurisdiction | MARIN CA |
| Township / Civil Division | SOUTHEAST MARIN |
| Census Block Group | 3 |
| Census Block | 3005 |
| Census Tract | 126200 |
Source: Marin County records, as of July 13, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | Individual Name on Record |
|---|---|
| Mailing Address | 21 BYRON CIR, MILL VALLEY, CA 94941-4627 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Nov 27, 2019 · Amount on Record |
| Deed Sale | Nov 27, 2019 · Amount on Record |
| Deed Document Number | 201945106 |
| Prior Transfer Date | Sep 7, 2001 |
| Prior Transfer Doc | 0000071096 |
| Record Updated | Oct 29, 2026 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | MARIN CA |
| Recording Date | Nov 27, 2019 |
| Property Address | 21 BYRON CIR, MILL VALLEY, CA 94941-4627 |
| Document Number | 0000045106 |
| Instrument Date | Oct 30, 2019 |
| Instrument | 45106 |
| Transaction Type | Transfer |
| Record Updated | Dec 11, 2019 |
| Title Company | FIDELITY NATIONAL TITLE, FIDELITY NATIONAL TITLE CO |
| Amount | Amount Recorded |
|---|---|
| Downpayment | Downpayment on Record |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $874.50 |
| Amount Accuracy | Full Value |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 21 BYRON CIR MILL VALLEY CA 949414627, MILL VALLEY, CA 94941-4627 |
| Document Number | 45107 |
|---|---|
| Date | Nov 27, 2019 |
| Instrument | 45107 |
| Name | USAA |
|---|---|
| Address | SAN ANTONIO, TX 78288-0544 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 360 Months |
| Due | Nov 26, 2049 |
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 | $886,822 (+2%) Land $443,411 Building $443,411 | |
| 2025 | $13,370.00 (+4.76%) Homeowner's exemption | $869,434 (+4.04%) Land $434,717 Building $434,717 |
| 2023 | $12,762.00 (+4.13%) Homeowner's exemption | $835,680 Land $417,840 Building $417,840 |
| 2022 | $12,256.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
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 |
| Nearby Flood Policies | 1 in force |
| Nearby Flood Claims | 18 (1980–2005) |
| Claims Outside the SFHA | 2 of 18 |
| Most Recent Claim | Dec 2005 · Severe Storms, Flooding, Mudslides, And Landslides |
| 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.
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 | 0.01% annual chance |
| Exposure | None beyond 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 | 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 473 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Unwired Fixed Wireless | 300 / 25 |
| Verizon Fixed Wireless | 300 / 20 |
May also be available: AT&T, Etheric Networks, T-Mobile.
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