Suffolk County and Islip Town property record for 9 William Ave, Islip, NY 11751 · Last verified August 2026
| Property Type | Residential > Multi-Unit > Duplex |
|---|---|
| Architecture Style | Duplex Single |
| Lot Size | 6,098 sqft (0.14 acres) |
| Occupancy | Owner Occupied |
| Last Sale | $305,000 (2004) |
| Primary APN | 472889 345.-1-1 |
|---|---|
| Alternative APNs |
|
| Architectural Style | Duplex Single Style |
|---|---|
| Lot Area | 6,098 sqft (0.14 acres) |
| Lot Width | 54.3 ft Width |
| Account Number | 567080 |
|---|---|
| Street Address | 9 WILLIAM AVE |
| City | ISLIP |
| State | NY |
| Zip | 11751-2715 |
| Property Usage | Residential Property Usage |
| Type | Residential > Multi-Unit > Duplex |
| Legal Description | X2218704Y187335 T044H00000000 |
| Legal Block | 5000 |
| Legal Lot Number | 100 |
| Jurisdiction | SUFFOLK NY |
| Minor Civil Division | ISLIP |
| Census Blockgroup | 1 |
| Census Block | 1015 |
| Census Tract | 147401 |
Source: Suffolk County and Islip Town records · APN 472889 345.-1-1
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 | 9 WILLIAM AVE, ISLIP, NY 11751-2715 |
| Occupancy | Owner Occupied |
| Owner Type | Owner is an Individual, Couple or Unincorporated Entity |
| Deed Names | Verified Name on Deed |
|---|---|
| Last Sale | Feb 19, 2004 · Amount on Record |
| Deed Sale | Feb 19, 2004 · Amount on Record |
| Deed Book / Page | 12302 / 143 |
| Record Refreshed | Sep 20, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | SUFFOLK NY |
| Property Address | 9 WILLIAM AVE, ISLIP, NY 11751-2715 |
| Transaction Type | Mortgage |
| Record Updated | Oct 17, 2023 |
| Name | Verified Name |
|---|
| Document Number | 0234130290 |
|---|---|
| Date | May 03, 2022 |
| Book Page | 23413/290 |
| Name | JOVIA FINANCIAL CREDIT UNION |
|---|
| Type | Line of Credit |
|---|---|
| Amount | Amount Recorded |
| Term | 361 Months |
| Due | Jun 01, 2052 |
| Rate Type | Adjustable Rate |
|---|
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, not market price estimates; both are a fraction of this property's market value.
| Year | Assessed Value | Assessed Market Value |
|---|---|---|
| 2025 | $42,700 (-) Land $5,500 Building $37,200 | |
| 2024 | $601,409 (+2.54%) Land $77,465 Building $523,944 | |
| 2023 | $42,700 Land $5,500 Building $37,200 | $586,538 Land $75,549 Building $510,989 |
Source: FEMA National Flood Hazard Layer, Suffolk County (36103C), updated September 18, 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026
| FEMA Flood Zone | Zone X |
|---|---|
| Flood Hazard | Minimal |
| 500-Year Floodplain | No |
| Special Flood Hazard Area | No |
| 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; lenders make the official flood determination.
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