Westchester County and Mount Vernon City property record for 421 S 9th Ave, Mount Vernon, NY 10550
| Property Type | Duplex |
|---|---|
| Lot Size | 0.12 acres (5,227 sqft) |
| Owner | 2 Individual Names on Record |
| Tax Bill | $12,203 (2026) |
| Flood Zone | Zone X (minimal risk) |
| APN | 550800 169.38-3058-35 |
| Primary APN | 550800 169.38-3058-35 |
|---|---|
| Alternative APNs |
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| Architectural Style | Duplex Single |
|---|---|
| Lot Area | 5,227 sqft (0.12 acres) |
| Account Number | 068990 |
|---|---|
| Street Address | 421 S 9TH AVE |
| City | MOUNT VERNON |
| State | NY |
| Zip | 10550-4301 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Duplex |
| Legal Block | 3058 |
| Legal Lot Number | 35.000 |
| Jurisdiction | WESTCHESTER NY |
| Township / Civil Division | MOUNT VERNON |
| Census Block Group | 2 |
| Census Block | 2006 |
| Census Tract | 2800 |
Source: Westchester County and Mount Vernon City records, as of October 21, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | 2 Individual Names on Record |
|---|---|
| Mailing Address | 411 S 4TH AVE, MOUNT VERNON, NY 10550-4401 |
| Owner Type | Individual |
| Deed Names | 2 Names on Deed |
|---|---|
| Record Updated | Oct 29, 2026 |
Source: Westchester County and Mount Vernon City assessment roll, as of May 14, 2026
| Type | Name |
|---|---|
| State | New York |
| County | Westchester County |
| Municipality | Mount Vernon City |
| Unified School District | Mount Vernon School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $12,203.00 (+18.26%) | ||
| 2025 | $10,319.00 | $7,100 (-) Land $2,600 Building $4,500 | $394,444 (+6.67%) Land $144,444 Building $250,000 |
| 2024 | $7,100 (-) Land $2,600 Building $4,500 | $369,792 (-10.94%) Land $135,417 Building $234,375 | |
| 2023 | $7,100 Land $2,600 Building $4,500 | $415,205 Land $152,047 Building $263,158 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
Source: FEMA National Flood Hazard Layer, effective September 18, 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 Claims | 1 (2007) |
| Claims Outside the SFHA | 1 of 1 |
| Most Recent Claim | Apr 2007 · Severe Storms And Inland And Coastal Flooding |
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 99.1% of the US · lower than 99.2% of New York |
|---|---|
| Wildfire Likelihood | Under 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 | MOUNT VERNON WATER DEPARTMENT serves 73,893 people · EPA ID NY5903441 |
|---|---|
| Water Source | Purchased surface water from several systems |
| Last State Inspection | Jul 2025 |
| Lead | 7 ppb (2025–2027) 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 966 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Verizon Fiber · Fixed Wireless in parts of the area | 2,300 / 2,300 |
| Spectrum Cable | 1,000 / 1,000 |
May also be available: Optimum, T-Mobile.
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