Los Angeles County property record for 620 Mount St, Diamond Bar, CA 91765
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2 ba · 1,554 sqft · built 1972 |
| Lot Size | 0.182 acres (7,947 sqft) |
| Owner | Individual Name on Record |
| Last Sale | $188,000 (Jun 1996) |
| Tax Bill | $4,616 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 8717-021-024 |
| Primary APN | 8717-021-024 |
|---|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 10 Rooms |
| Stories | 1 Story |
| Building Area | 1,554 sqft Living Area |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1972 |
|---|---|
| Effective Year Built | Effective 1972 |
| Architectural Style | Conventional |
| Exterior Material | Stucco |
| Construction Type | Wood |
| Roof Type | Gable |
| Roof Material | Wood Shingle |
| Lot Area | 7,947 sqft (0.182 acres) |
| Lot Dimensions | 134 ft deep x 60 ft wide |
| Garage Type | Attached |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 620 MOUNT ST |
|---|---|
| City | DIAMOND BAR |
| State | CA |
| Zip | 91765-1938 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | LCR18000* |
| Legal Description | TRACT NO 31139 LOT 24 |
| Legal Subdivision | 31139 |
| Legal Tract | 31139 |
| Legal Block | 2 |
| Legal Lot Number | 24 |
| Jurisdiction | LOS ANGELES CA |
| Township / Civil Division | EAST SAN GABRIEL VALLEY |
| Census Block Group | 2 |
| Census Block | 2001 |
| Census Tract | 403319 |
Source: Los Angeles County records, as of August 25, 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 | 620 MOUNT ST, DIAMOND BAR, CA 91765-1938 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Jun 12, 1996 · Amount on Record |
| Deed Sale | Jun 12, 1996 · Amount on Record |
| Deed Document Number | 1996923789 |
| Record Updated | Oct 29, 2026 |
Source: Los Angeles County assessment roll, as of August 25, 2026
| Type | Name |
|---|---|
| State | California |
| County | Los Angeles County |
| Municipality | Diamond Bar City |
| Unified School District | Pomona Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $318,531 (+2%) Land $144,185 Building $174,346 | |
| 2025 | $4,616.00 (+11.58%) Homeowner's exemption | $312,286 (+4.04%) Land $141,358 Building $170,928 |
| 2023 | $4,137.00 (+1.67%) Homeowner's exemption | $300,162 Land $135,870 Building $164,292 |
| 2022 | $4,069.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
Source: FEMA National Flood Hazard Layer, effective September 30, 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.
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 | WALNUT VALLEY WATER DISTRICT serves 100,941 people · EPA ID CA1910234 |
|---|---|
| Water Source | Purchased surface water from several systems |
| Last State Inspection | Jun 2023 |
| 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 215 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Spectrum Cable | 1,000 / 1,000 |
| AT&T Fixed Wireless | 100 / 20 |
May also be available: GeoLinks, T-Mobile, Verizon.
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