Nassau County and Oyster Bay Town property record for 21 Harrison Ave, Massapequa, NY 11758
| Property Type | Single Family Home |
|---|---|
| Details | 2 ba · 2,197 sqft · built 1962 |
| Lot Size | 0.185 acres (8,064 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $518,000 (Sep 2016) |
| Tax Bill | $16,212 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 65-233-00-0009 |
| Primary APN | 65-233-00-0009 |
|---|---|
| Alternative APNs |
|
| Full Baths | 2 Baths |
|---|---|
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 2,197 sqft Living Area |
| 1st Floor Area | 1,138 sqft |
| Basement Area | 738 sqft |
| Finished Basement | 738 sqft |
| Year Built | Built 1962 |
|---|---|
| Effective Year Built | Effective 1962 |
| Architectural Style | Raised Ranch |
| Exterior Material | Aluminum/Vinyl |
| Construction Type | Frame |
| Foundation Type | Concrete |
| Roof Material | Other |
| Lot Area | 8,064 sqft (0.185 acres) |
| Lot Dimensions | 113 ft deep x 72 ft wide |
| Garage Type | Basement |
| Parking Spaces | 2 Parking Spaces |
| Porch | Open Frame Porch |
|---|---|
| Porch Area | 50 sqft |
| Deck Area | 182 sqft |
| Patio Area | 182 sqft |
| Balcony Area | 321 sqft |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Heating Fuel | Oil |
| Sewer | Municipal |
| Water Source | Commercial |
| Account Number | 65233 00090 |
|---|---|
| Street Address | 21 HARRISON AVE |
| City | MASSAPEQUA |
| State | NY |
| Zip | 11758-7909 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | TOWN #3 SCH DIST 023 |
| Legal Subdivision | BAYGREEN SEC 4/MASSAPEQUA |
| Legal Block | 233 |
| Legal Lot Number | 9 |
| Jurisdiction | NASSAU NY |
| Township / Civil Division | OYSTER BAY |
| Census Block Group | 2 |
| Census Block | 2011 |
| Census Tract | 521302 |
21 Harrison Ave is owned and occupied by two individuals who bought it in September 2016.
Source: Nassau County and Oyster Bay Town records, as of June 17, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 21 HARRISON AVE, MASSAPEQUA, NY 11758-7909 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
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 | 2 Names on Deed |
|---|---|
| Last Sale | Sep 6, 2016 · Amount on File |
| Deed Sale | Sep 6, 2016 · Amount on File |
| Prior Sale | Oct 27, 2004 · Amount on File |
| Deed Document Number | 201686405 |
| Deed Book / Page | 13407 / 831 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 21 Harrison Ave was $16,212.
Source: Nassau County and Oyster Bay Town assessment roll, as of June 17, 2026
| Type | Name |
|---|---|
| State | New York |
| County | Nassau County |
| County Subdivision | Oyster Bay Town |
| Unified School District | Massapequa Union Free School District (KG - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $603 Land $243 Building $360 | $612,000 | |
| 2025 | $16,212.00 | ||
| 2023 | $16,045.00 Additional exemption filed | $612 Land $243 Building $369 | $612,000 |
Assessed value and assessed market value are set for property tax purposes, not market price estimates; both are a fraction of this property's market value.
FEMA maps place 21 Harrison Ave in Zone X, an area of minimal flood risk, though there have been 691 flood claims nearby since 1978.
Source: FEMA National Flood Hazard Layer, effective April 5, 2023 · 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 |
| Flood Insurance Cost | Premium on File median of 386 policies |
| Nearby Flood Policies | 386 in force |
| Nearby Flood Claims | 691 (1978–2024) |
| Claims Outside the SFHA | 184 of 691 |
| Most Recent Claim | May 2024 · 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.
The area around 21 Harrison Ave 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 | MASSAPEQUA WD public/private · serves 43,000 people · EPA ID NY2902837 |
|---|---|
| Water Source | Groundwater |
| Last State Inspection | Dec 2024 |
| Lead | Under 1 ppb (2021–2023) 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 756 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Optimum Fiber · Cable | 8,000 / 8,000 |
| Verizon Fiber | 2,300 / 2,300 |
| T-Mobile Fixed Wireless | 100 / 20 |
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