Contra Costa County property record for 321 W 9th St, Antioch, CA 94509
| Property Type | Single Family Home |
|---|---|
| Details | 5 bd · 4 ba · 2,444 sqft · built 1929 |
| Lot Size | 0.172 acres (7,500 sqft) |
| Owner | Individual Name on File |
| Last Sale | $125,000 (Mar 2012) |
| Tax Bill | $5,369 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 066-187-006-3 |
| Primary APN | 066-187-006-3 |
|---|---|
| Alternative APN |
|
| Bedrooms | 5 Beds |
|---|---|
| Full Baths | 4 Baths |
| Total Rooms | 12 Rooms |
| Stories | 2 Stories |
| Building Area | 2,444 sqft Living Area |
| Gross Area | 1,612 sqft |
| 1st Floor Area | 832 sqft |
| 2nd Floor Area | 780 sqft |
| Year Built | Built 1929 |
|---|---|
| Effective Year Built | Effective 1980 |
| Lot Area | 7,500 sqft (0.172 acres) |
| Garage Type | Attached |
| Garage Area | 529 sqft |
| Parking Spaces | 2 Parking Spaces |
| Street Address | 321 W 9TH ST |
|---|---|
| City | ANTIOCH |
| State | CA |
| Zip | 94509-1739 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R2 |
| Legal Description | TOWN OF ANTIOCH LOT 6 & W HF OF 5 BLK 112 |
| Legal Subdivision | ANTIOCH |
| Legal Block | 112 |
| Legal Lot Number | 6 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | ANTIOCH-PITTSBURG |
| Census Block Group | 1 |
| Census Block | 1024 |
| Census Tract | 305000 |
321 W 9th St is owned by an individual who bought it in March 2012.
Source: Contra Costa County records, as of July 14, 2026
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | PO BOX 681, ANTIOCH, CA 94509-0068 |
| Owner Type | Individual |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Mar 26, 2012 · Amount on File |
| Deed Sale | Mar 26, 2012 · Amount on File |
| Deed Document Number | 201268166 |
| Prior Transfer Date | May 28, 1996 |
| Prior Transfer Doc | 0000105419 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 321 W 9th St was $5,369.
Source: Contra Costa County assessment roll, as of July 14, 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Municipality | Antioch City |
| Unified School District | Antioch Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $388,703 (+2%) Land $112,095 Building $276,608 | |
| 2025 | $5,369.00 | $381,083 Land $109,898 Building $271,185 |
| 2023 | $5,062.00 (+0.54%) | $366,287 Land $105,632 Building $260,655 |
| 2022 | $5,035.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 321 W 9th St in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective October 12, 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
Values are read at the parcel center point; lenders make the official flood determination.
The area around 321 W 9th St has no burnable land within ember reach, so its wildfire risk is not rated.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Not rated no burnable land within 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 | CITY OF ANTIOCH serves 116,781 people · EPA ID CA0710001 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Jan 2024 |
| Lead | Under 1 ppb (2022–2024) 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.
Source: FCC Broadband Data Collection, based on 605 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber · Fixed Wireless, DSL in parts of the area | 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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