Suffolk County and Islip Town property records for 12 addresses on William Ave, Islip, NY · Last verified August 2026
| Properties | 12 |
|---|---|
| Median Sale Price | $363,500 |
| Deeds and Mortgages on File | 16 |
| Median Price per Sqft | $236 |
| Owner Occupied | 100% |
| Median Annual Tax Bill | $13,020 |
| Median Year Built | 1991 |
| Median Ownership Tenure | 8 years |
Owner names and prior sale amounts shown locked below are available instantly with a free trial.
1,276 sqft · Built 1959 · 0.339 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $345,000Apr 2018 | $11,9502024 | 2 Names on Record Owner Occupied | Assessor + 2 DocumentsUpdated Aug 2026 |
0.21 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $98,000Jan 1995 | 2 Names on Record Owner Occupied | AssessorUpdated Aug 2026 |
0.139 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $305,000Feb 2004 | 1 Name on Record Owner Occupied | Assessor + 1 DocumentUpdated Aug 2026 |
0.21 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 2 Names on Record Owner Occupied | AssessorUpdated Aug 2026 |
0.119 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 1 Name on Record Owner Occupied | AssessorUpdated Aug 2026 |
0.219 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $220,000Aug 2018 | Amount on Record Apr 2002 | 1 Name on Record Owner Occupied | Assessor + 2 DocumentsUpdated Jul 2026 |
2,026 sqft · Built 1968 · 0.119 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $480,000Jul 2019 | $13,0202024 | Amount on Record Apr 2017 | 2 Names on Record Owner Occupied | Assessor + 2 DocumentsUpdated Aug 2026 |
2,479 sqft · Built 1996 · 0.26 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $580,000Jun 2025 | Amount on Record Aug 1997 | 1 Name on Record Owner Occupied | Assessor + 2 DocumentsUpdated Aug 2026 |
2,160 sqft · Built 1991 · 0.169 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $363,500Sep 2018 | $12,8622024 | Amount on Record Oct 2000 | 1 Name on Record Owner Occupied | Assessor + 4 DocumentsUpdated Aug 2026 |
0.169 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $399,930Nov 2016 | $15,0652024 | 2 Names on Record Owner Occupied | Assessor + 2 DocumentsUpdated Aug 2026 |
0.269 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $237,000Dec 2017 | 2 Names on Record Owner Occupied | AssessorUpdated Aug 2026 |
0.13 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Aug 2026 |
Source: USDA Forest Service Wildfire Risk to Communities · 2nd edition (2024), fuels as of 2020
| Wildfire Risk | Low this street's cells rank at the 3rd percentile of exposed land nationally · 3rd in New York |
|---|---|
| Wildfire Likelihood | Low — less than 1 in 10,000 per year |
| Exposure | Direct 1 of 2 cells directly exposed · 1 adjoin burnable vegetation |