Suffolk County and Islip Town property record for 11 William Ave, Islip, NY 11751 · Last verified August 2026
| Property Type | Single Family Home |
|---|---|
| Lot Size | 0.12 acres (5,227 sqft) |
| Owner | Individual Name on File |
| Flood Zone | Zone X (minimal risk) |
| APN | 472889 320.-1-70 |
| Primary APN | 472889 320.-1-70 |
|---|---|
| Alternative APNs |
|
| Lot Area | 5,227 sqft (0.12 acres) |
|---|---|
| Lot Width | 50 ft Width |
| Account Number | 566910 |
|---|---|
| Street Address | 11 WILLIAM AVE |
| City | ISLIP |
| State | NY |
| Zip | 11751-2722 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | X2218730Y187468 T044H00000000 |
| Legal Block | 0001 |
| Legal Lot Number | 100 |
| Jurisdiction | SUFFOLK NY |
| Township / Civil Division | ISLIP |
| Census Block Group | 1 |
| Census Block | 1016 |
| Census Tract | 147401 |
Source: Suffolk County and Islip Town records · APN 472889 320.-1-70
Assessment roll updated August 11, 2026 · Last verified August 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 File |
|---|---|
| Mailing Address | 11 WILLIAM AVE, ISLIP, NY 11751-2722 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | Verified Name on Deed |
|---|---|
| Record Updated | Sep 20, 2026 |
Source: Suffolk County and Islip Town records · Assessment roll updated August 11, 2026 · Last verified August 2026
| Type | Name |
|---|---|
| State | New York |
| County | Suffolk County |
| County Subdivision | Islip Town |
| Unified School District | Islip Union Free School District (KG - 12) |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
| Year | Assessed Value | Assessed Market Value |
|---|---|---|
| 2025 | $30,600 (-) Land $5,500 Building $25,100 | |
| 2024 | $430,986 (+2.54%) Land $77,465 Building $353,521 | |
| 2023 | $30,600 Land $5,500 Building $25,100 | $420,329 Land $75,549 Building $344,780 |
Source: FEMA National Flood Hazard Layer, Suffolk County (36103C), updated September 18, 2026 · FEMA OpenFEMA NFIP redacted claims and policies, census block group 361031474011, refreshed September 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026
| FEMA Flood Zone | Zone X |
|---|---|
| Special Flood Hazard Area | No |
| Flood Hazard | Minimal |
| 500-Year Floodplain | No |
| Nearby Flood Policies | 4 in force |
| Nearby Flood Claims | 25 (1979–2023) |
| Claims Outside the SFHA | 18 of 25 |
| Most Recent Claim | Jul 2023, river or lake flooding |
| Claims By Storm |
|
| Wildfire Risk | Not rated no burnable land in reach |
|---|---|
| Wildfire Likelihood | Negligible |
| Exposure | None beyond ember reach |
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: FCC Broadband Data Collection, availability as of December 31, 2025 · Published October 2026 · based on 329 locations within about half a mile of this property
| Provider | Technology | Download / Upload (Mbps) |
|---|---|---|
| Optimum Communications | Fiber | 8,000 / 8,000 |
| Verizon | Fiber | 2,300 / 2,300 |
| Optimum Communications | Cable | 940 / 35 |
May also be available at this address: Verizon. Availability varies by address; speeds are provider-advertised maximums, not measured.
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