Contra Costa County property record for 3980 Rancho Diablo Rd, Byron, CA 94514
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2.5 ba · 2,609 sqft · built 1999 |
| Lot Size | 1.12 acres (49,222 sqft) |
| Owner | Trust Name on File |
| Last Sale | $545,000 (Oct 2000) |
| Tax Bill | $11,208 (2025) |
| Flood Zone | Zone X (moderate risk) |
| APN | 002-270-007-4 |
| Primary APN | 002-270-007-4 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 9 Rooms |
| Stories | 1 Story |
| Building Area | 2,609 sqft Living Area |
| 1st Floor Area | 2,609 sqft |
| Year Built | Built 1999 |
|---|---|
| Effective Year Built | Effective 1999 |
| Lot Area | 49,222 sqft |
| Garage Type | Attached |
| Garage Area | 1,008 sqft |
| Parking Spaces | 4 Parking Spaces |
| Street Address | 3980 RANCHO DIABLO RD |
|---|---|
| City | BYRON |
| State | CA |
| Zip | 94514-0108 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R40 |
| Legal Description | T7969 L7 |
| Legal Tract | 7969 |
| Legal Lot Number | 7 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | EAST CONTRA COSTA |
| Census Block Group | 1 |
| Census Block | 1031 |
| Census Tract | 304002 |
3980 Rancho Diablo Rd is owner-occupied and held in a trust since October 2000.
Source: Contra Costa County records, as of July 14, 2026
| Owner of Record | Trust Name on File |
|---|---|
| Mailing Address | PO BOX 100, BYRON, CA 94514-0100 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
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 | Oct 18, 2000 · Amount on File |
| Deed Sale | Oct 18, 2000 · Amount on File |
| Prior Sale | Sep 20, 1999 · Amount on File |
| Deed Document Number | 2000231579 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 3980 Rancho Diablo Rd was $11,208 with a homeowner's exemption.
Source: Contra Costa County assessment roll, as of July 14, 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Elementary School District | Byron Union Elementary School District (KG - 08) |
| Secondary School District | Liberty Union High School District (09 - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $901,162 (+2%) Land $268,962 Building $632,200 | |
| 2025 | $11,208.00 Homeowner's exemption | $883,493 Land $263,689 Building $619,804 |
| 2023 | $9,683.00 (-8.36%) Homeowner's exemption | $849,187 Land $253,450 Building $595,737 |
| 2022 | $10,566.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 3980 Rancho Diablo Rd in Zone X, an area of moderate flood risk, though there have been 7 flood claims nearby since 1980.
Source: FEMA National Flood Hazard Layer, effective October 12, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X moderate risk |
|---|---|
| 500-Year Floodplain | Yes 0.2% annual chance |
| Flood Insurance Requirement | Not required lenders may require it |
| Flood Insurance Cost | Premium on File median of 22 policies |
| Community Rating System | Class 6 (20% premium discount) |
| Nearby Flood Policies | 22 in force |
| Nearby Flood Claims | 7 (1980–2023) |
| Claims Outside the SFHA | 2 of 7 |
| Most Recent Claim | Mar 2023 · rainfall accumulation |
| 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 3980 Rancho Diablo Rd is high, ranking above 83% of the US, with a 0.7% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | High above 83% of the US · above 62% of California |
|---|---|
| Wildfire Likelihood | 0.7% annual chance |
| Exposure | Direct burnable vegetation |
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: FCC Broadband Data Collection, based on 39 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 1,200 / 35 |
| Unwired Fixed Wireless | 300 / 25 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: Verizon.
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