Suffolk County and Islip Town property records for 14 addresses on William Ave, East Islip, NY · Last verified October 2026
| Properties | 14 |
|---|---|
| Median Sale Price | $445,000 |
| Deeds and Mortgages on File | 7 |
| Median Price per Sqft | $292 |
| Owner Occupied | 86% |
| Median Annual Tax Bill | $11,950 |
| Median Year Built | 1949 |
| Median Ownership Tenure | 14 years |
Owner names and prior sale amounts shown locked below are available instantly with a free trial.
0.469 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| Owner on Record | AssessorUpdated Aug 2026 |
0.25 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $300,000Oct 2003 | $11,9502024 | Amount on Record Jan 2003 | 2 Owners on Record Owner Occupied | AssessorUpdated Aug 2026 |
0.25 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 2 Owners on Record Owner Occupied | AssessorUpdated Aug 2026 |
0.089 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 2 Owners on Record | Assessor + 1 DocumentUpdated Aug 2026 |
0.089 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $181,000Jan 2003 | 2 Owners on Record Owner Occupied | AssessorUpdated Aug 2026 |
1,540 sqft · built 1910 · 0.25 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $450,000May 2005 | $8,8092024 | Amount on Record Jan 2003 | 2 Owners on Record Owner Occupied | AssessorUpdated Aug 2026 |
0.25 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $12,1302024 | 2 Owners on Record Owner Occupied | AssessorUpdated Aug 2026 |
0.25 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $510,000Aug 2012 | $11,9502024 | Amount on Record Apr 2003 | 2 Owners on Record Owner Occupied | AssessorUpdated Aug 2026 |
0.25 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $445,000Nov 2014 | Owner on Record Owner Occupied | Assessor + 2 DocumentsUpdated Oct 2026 |
0.489 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $355,000Mar 2014 | $16,3692024 | 2 Owners on Record Owner Occupied | Assessor + 1 DocumentUpdated Aug 2026 |
1,496 sqft · built 1900 · 0.25 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $575,000May 2022 | $10,0202024 | Amount on Record Jun 2016 | 2 Owners on Record Owner Occupied | AssessorUpdated Aug 2026 |
0.25 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $280,000Sep 2005 | $8,3482024 | Owner on Record Owner Occupied | AssessorUpdated Aug 2026 |
1,638 sqft · built 2016 · 0.25 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $328,000Sep 2017 | Amount on Record Mar 2013 | Owner on Record Owner Occupied | Assessor + 1 DocumentUpdated Aug 2026 |
1,760 sqft · built 1949 · 0.18 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $165,000Sep 2011 | Owner on Record Owner Occupied | Assessor + 2 DocumentsUpdated Aug 2026 |