Contra Costa County property record for 321 W 4th St, Antioch, CA 94509
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 1 ba · 1,975 sqft · built 1916 |
| Lot Size | 0.172 acres (7,500 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $571,000 (Jun 2022) |
| Tax Bill | $6,213 (2025) |
| Deeds & Mortgages | Jun 2022 Sale & Mortgage May 2022 Transfer |
| Flood Zone | Zone X (minimal risk) |
| APN | 066-151-008-1 |
| Primary APN | 066-151-008-1 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 7 Rooms |
| Stories | 2 Stories |
| Building Area | 1,975 sqft Living Area |
| 1st Floor Area | 1,777 sqft |
| 2nd Floor Area | 198 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1916 |
|---|---|
| Effective Year Built | Effective 1938 |
| Architectural Style | Colonial |
| Exterior Material | Aluminum/Vinyl |
| Roof Material | Composition Shingle |
| Lot Area | 7,500 sqft (0.172 acres) |
| Garage Type | Attached |
| Garage Area | 200 sqft |
| Parking Spaces | 1 Parking Space |
| Cooling System | Central |
|---|---|
| Heating System | Forced Air with A/C |
| Sewer | Municipal |
| Water Source | Commercial |
| Street Address | 321 W 4TH ST |
|---|---|
| City | ANTIOCH |
| State | CA |
| Zip | 94509-1242 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R2 |
| Legal Description | TOWN OF ANTIOCH LOT 6 POR 5 BLK 58 |
| Legal Subdivision | ANTIOCH |
| Legal Block | 58 |
| Legal Lot Number | 6 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | ANTIOCH-PITTSBURG |
| Census Block Group | 3 |
| Census Block | 3048 |
| Census Tract | 305000 |
321 W 4th St is owned and occupied by two individuals who bought it in June 2022.
Source: Contra Costa County records, as of July 14, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 321 W 4TH ST, ANTIOCH, CA 94509-1242 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Joint Tenants |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Date | Document |
|---|---|
| Jun 15, 2022 | Grant Deed, Transfer · FHA Mortgage CROSSCOUNTRY MORTGAGE LLC |
| May 18, 2022 | Intrafamily Transfer, Transfer |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Jun 15, 2022 · Amount on File |
| Deed Sale | Jun 15, 2022 · Amount on File |
| Deed Document Number | 202299161 |
| Prior Transfer Date | Mar 3, 2020 |
| Prior Transfer Doc | 0000085086 |
| Record Updated | Sep 20, 2026 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | Jun 15, 2022 |
| Property Address | 321 W 4TH ST, ANTIOCH, CA 94509-1242 |
| Document Number | 0000099161 |
| Instrument Date | Jun 10, 2022 |
| Instrument | 2022-099161 |
| Transaction Type | Transfer |
| Record Updated | Nov 3, 2022 |
| Title Company | NOT AVAILABLE, HOMELIGHT TITLE & ESCROW CO |
| Amount | Amount on Record |
|---|---|
| Downpayment | Downpayment on Record |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $0.00 |
| Amount Accuracy | Rounded by County |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Joint Tenants |
| Address | 321 W 4TH ST, ANTIOCH, CA 94509-1242 |
| Document Number | 0000099162 |
|---|---|
| Date | Jun 15, 2022 |
| Instrument | 2022-099162 |
| Name | CROSSCOUNTRY MORTGAGE LLC |
|---|---|
| Type | Mortgage Company |
| Type | FHA Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | Jul 1, 2052 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | May 18, 2022 |
| Property Address | 321 W 4TH ST, ANTIOCH, CA 94509-1242 |
| Document Number | 0000085086 |
| Instrument Date | Mar 3, 2020 |
| Instrument | 2022-085086 |
| Transaction Type | Transfer |
| Record Updated | Jun 7, 2023 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Living Trust |
| Address | 3227 PAGE ST, REDWOOD CITY, CA 94063-4322 |
The 2025 property tax bill for 321 W 4th St was $6,213.
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 | $504,000 (-) Land $353,066 Building $150,934 | |
| 2025 | $6,213.00 | $504,000 Land $353,066 Building $150,934 |
| 2023 | $6,010.00 (+33.17%) | $493,000 Land $345,000 Building $148,000 |
| 2022 | $4,513.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 321 W 4th St in Zone X, an area of minimal flood risk, though there have been 1 flood claim nearby since 2017.
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 minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 5 in force |
| Nearby Flood Claims | 1 (2017) |
| Most Recent Claim | Feb 2017 · Severe Winter Storms, Flooding, And Mudslides |
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.
The area around 321 W 4th 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 374 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 |
| Unwired Fixed Wireless | 300 / 25 |
May also be available: T-Mobile, Verizon.
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