Suffolk County and Islip Town property record for 41 William Ave, Islip, NY 11751 · Last verified August 2026
| Property Type | Residential > Single Family > Home |
|---|---|
| Lot Size | 5,663 sqft (0.13 acres) |
| Occupancy | Owner Occupied |
| Primary APN | 472889 320.-1-41 |
|---|---|
| Alternative APNs |
|
| Lot Area | 5,663 sqft (0.13 acres) |
|---|---|
| Lot Width | 50 ft Width |
| Account Number | 566650 |
|---|---|
| Street Address | 41 WILLIAM AVE |
| City | ISLIP |
| State | NY |
| Zip | 11751-2721 |
| Property Usage | Residential Property Usage |
| Type | Residential > Single Family > Home |
| Legal Description | X2218738Y187871 T044H00000000 |
| Legal Block | 0001 |
| Legal Lot Number | 100 |
| Jurisdiction | SUFFOLK NY |
| Minor Civil Division | ISLIP |
| Census Blockgroup | 1 |
| Census Block | 1014 |
| Census Tract | 147401 |
Source: Suffolk County and Islip Town records · APN 472889 320.-1-41
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 | 2 Individual Names on File |
|---|---|
| Mailing Address | 41 WILLIAM AVE, ISLIP, NY 11751-2721 |
| Occupancy | Owner Occupied |
| Owner Type | Owner is an Individual, Couple or Unincorporated Entity |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Record Refreshed | Sep 20, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | SUFFOLK NY |
| Recording Date | Jun 15, 2026 |
| Property Address | 41 WILLIAM AVE, ISLIP, NY 11751-2721 |
| Document Number | 2373000113 |
| Book / Page | 23732 / 113 |
| Instrument Date | Mar 25, 2026 |
| Transaction Type | Mortgage |
| Record Updated | Jul 29, 2026 |
| Name | Verified Name |
|---|---|
| Address | 41 WILLIAM AVE, ISLIP, NY 11751-2721 |
| Document Number | 2373000113, |
|---|---|
| Date | Jun 15, 2026 |
| Book Page | 23732/113 |
| Name | UNION FEDERAL CREDIT UNION |
|---|
| Type | Line of Credit |
|---|---|
| Amount | Amount Recorded |
| Term | 360 Months |
| Due | Jul 01, 2056 |
| Rate Type | Adjustable Rate |
|---|---|
| Rate | 5.98% |
| Initial Type | Adjustable Rate |
| Max Rate | -1% |
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 | $24,400 (-) Land $5,500 Building $18,900 | |
| 2024 | $343,662 (+2.54%) Land $77,465 Building $266,197 | |
| 2023 | $24,400 Land $5,500 Building $18,900 | $335,164 Land $75,549 Building $259,615 |
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 | Low above 3% of the US · above 3% of New York |
|---|---|
| Wildfire Likelihood | Less than 1 in 10,000 per year |
| Exposure | Direct burnable vegetation at the parcel |
Values are read at the parcel center point; lenders make the official flood determination.
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