Suffolk County, Islip Town and Babylon Town property records for 71 addresses on Union Ave, Islip, NY · Last verified August 2026
| Properties | 71 |
|---|---|
| Median Sale Price | $685,000 |
| Deeds and Mortgages on File | 85 |
| Median Price per Sqft | $389 |
| Owner Occupied | 90% |
| Median Annual Tax Bill | $12,327 |
| Median Year Built | 1927 |
| Median Ownership Tenure | 18 years |
Owner names and prior sale amounts shown locked below are available instantly with a free trial.
0.088 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 1 Name on Record | AssessorUpdated Aug 2026 |
0.069 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $130,000Oct 2006 | 2 Names on Record | AssessorUpdated Aug 2026 |
0.11 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 1 Name on Record Owner Occupied | Assessor + 1 DocumentUpdated Aug 2026 |
0.139 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $260,000Aug 2007 | $9,5692024 | Amount on Record Jun 1995 | 2 Names on Record Owner Occupied | AssessorUpdated Aug 2026 |
0.31 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 2 Names on Record Owner Occupied | AssessorUpdated Aug 2026 |
1,545 sqft · Built 1925 · 0.13 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $459,000Aug 2017 | Amount on Record Mar 1999 | 1 Name on Record Owner Occupied | Assessor + 1 DocumentUpdated Jul 2026 |
0.35 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 1 Name on Record Owner Occupied | AssessorUpdated Jul 2026 |
0.28 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $520,900Jun 2008 | Amount on Record Feb 1996 | 1 Name on Record Owner Occupied | Assessor + 7 DocumentsUpdated Jul 2026 |
2,631 sqft · Built 2002 · 0.28 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $642,500Dec 2019 | Amount on Record Feb 2003 | 1 Name on Record | Assessor + 2 DocumentsUpdated Aug 2026 |
1,898 sqft · Built 1957 · 0.23 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $739,900Nov 2024 | Amount on Record Jan 2018 | 1 Name on Record | Assessor + 1 DocumentUpdated Aug 2026 |
0.31 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $650,000Nov 2009 | $15,2852024 | Amount on Record Oct 2007 | 2 Names on Record Owner Occupied | AssessorUpdated Aug 2026 |
0.41 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Aug 2026 |
0.53 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 2 Names on Record Owner Occupied | AssessorUpdated Aug 2026 |
0.26 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $131,000Jan 1994 | Amount on Record Jan 1994 | 1 Name on Record Owner Occupied | AssessorUpdated Jul 2026 |
0.26 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $128,500Mar 1998 | $15,4842024 | 2 Names on Record Owner Occupied | AssessorUpdated Aug 2026 |
2,275 sqft · Built 1927 · 0.18 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $510,000Jun 2007 | $13,3972024 | 2 Names on Record Owner Occupied | Assessor + 4 DocumentsUpdated Aug 2026 |
0.25 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 1 Name on Record Owner Occupied | AssessorUpdated Aug 2026 |
0.21 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $750,000Oct 2025 | $11,5412024 | Amount on Record Mar 2016 | 1 Name on Record | Assessor + 1 DocumentUpdated Aug 2026 |
0.28 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $37,000Dec 1996 | $11,6772024 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Aug 2026 |
0.21 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $12,3852024 | 1 Name on Record Owner Occupied | Assessor + 2 DocumentsUpdated Aug 2026 |
1,676 sqft · Built 1880 · 0.16 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 1 Name on Record Owner Occupied | Assessor + 1 DocumentUpdated May 2026 |
0.219 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $427,000Jul 2015 | $13,1772024 | 2 Names on Record Owner Occupied | AssessorUpdated Aug 2026 |
1,041 sqft · Built 1957 · 0.35 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $10,1332024 | 2 Names on Record Owner Occupied | Assessor + 4 DocumentsUpdated Aug 2026 |
1,473 sqft · Built 1920 · 0.18 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $420,000Oct 2017 | $11,2732024 | 2 Names on Record Owner Occupied | Assessor + 2 DocumentsUpdated Aug 2026 |
0.339 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $867,000May 2026 | Amount on Record Oct 2016 | 2 Names on Record Owner Occupied | Assessor + 2 DocumentsUpdated Aug 2026 |
2,026 sqft · Built 1930 · 0.43 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $590,000Feb 2018 | Amount on Record Jul 2002 | 1 Name on Record Owner Occupied | Assessor + 4 DocumentsUpdated May 2026 |
0.28 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $435,000Jul 2002 | $17,8122024 | Amount on Record Jul 1996 | 2 Names on Record Owner Occupied | AssessorUpdated Aug 2026 |
1,226 sqft · Built 1882 · 0.189 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $279,000Nov 2017 | $9,6842024 | 2 Names on Record Owner Occupied | Assessor + 3 DocumentsUpdated Aug 2026 |
0.239 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $410,000Jun 2005 | Amount on Record Apr 2003 | 1 Name on Record Owner Occupied | AssessorUpdated May 2026 |
1,815 sqft · Built 1877 · 0.21 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| —Oct 2021 | $12,8622024 | Amount on Record Jan 2020 | 2 Names on Record Owner Occupied | Assessor + 4 DocumentsUpdated Aug 2026 |
0.219 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $8,5312024 | 2 Names on Record Owner Occupied | AssessorUpdated Aug 2026 |
0.219 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $12,1172024 | 1 Name on Record Owner Occupied | AssessorUpdated Aug 2026 |
1,260 sqft · Built 1938 · 0.219 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $9,3822024 | 1 Name on Record Owner Occupied | Assessor + 2 DocumentsUpdated Aug 2026 |
0.56 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| —May 1994 | 1 Name on Record Owner Occupied | AssessorUpdated Aug 2026 |
1,495 sqft · Built 1937 · 0.25 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $350,000Nov 2016 | $8,5352024 | 2 Names on Record Owner Occupied | AssessorUpdated Aug 2026 |
1,539 sqft · Built 1900 · 0.289 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $685,000Jul 2026 | $10,9752024 | Amount on Record Dec 2019 | 2 Names on Record Owner Occupied | Assessor + 2 DocumentsUpdated Aug 2026 |
0.16 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Aug 2026 |
0.21 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $175,000Jan 1999 | 2 Names on Record Owner Occupied | Assessor + 2 DocumentsUpdated Jul 2026 |
1,416 sqft · Built 1890 · 0.16 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Aug 2026 |
0.2 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $170,000Oct 1997 | $10,6602024 | 2 Names on Record Owner Occupied | AssessorUpdated Aug 2026 |
0.239 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 2 Names on Record Owner Occupied | AssessorUpdated Aug 2026 |
0.339 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $240,000Dec 2001 | 2 Names on Record Owner Occupied | AssessorUpdated Jul 2026 |
1,466 sqft · Built 1917 · 0.23 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $593,000Jun 2021 | $12,3272024 | Amount on Record Jul 2016 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Aug 2026 |
900 sqft · Built 1931 · 0.18 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 1 Name on Record | Assessor + 2 DocumentsUpdated Aug 2026 |
0.23 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 1 Name on Record Owner Occupied | Assessor + 5 DocumentsUpdated Aug 2026 |
2,573 sqft · Built 1974 · 0.119 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $680,000Apr 2021 | $18,2112024 | Amount on Record Aug 1993 | 2 Names on Record Owner Occupied | Assessor + 3 DocumentsUpdated Aug 2026 |
0.18 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $447,500Feb 2016 | $12,2492024 | Amount on Record Feb 1999 | 2 Names on Record Owner Occupied | Assessor + 2 DocumentsUpdated Aug 2026 |
0.2 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $400,000Aug 2002 | $16,9532024 | Amount on Record May 1999 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Aug 2026 |
0.18 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $125,000Oct 1994 | 2 Names on Record Owner Occupied | AssessorUpdated Jul 2026 |
0.13 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $445,000Mar 2004 | $11,9602024 | 2 Names on Record Owner Occupied | Assessor + 3 DocumentsUpdated Aug 2026 |
0.2 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $535,000Oct 2006 | $11,2392024 | Amount on Record Dec 2001 | 2 Names on Record Owner Occupied | Assessor + 2 DocumentsUpdated Aug 2026 |
0.289 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 2 Names on Record Owner Occupied | AssessorUpdated Jul 2026 |
1,806 sqft · Built 1969 · 0.219 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $350,000Aug 2002 | $14,1312024 | 1 Name on Record Owner Occupied | Assessor + 2 DocumentsUpdated Aug 2026 |
2,755 sqft · Built 1875 · 0.2 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $456,000Feb 2020 | $16,6382024 | Amount on Record Apr 2005 | 1 Name on Record Owner Occupied | Assessor + 1 DocumentUpdated Aug 2026 |
0.23 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $435,000Jul 2010 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Aug 2026 |
0.36 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $300,000Mar 2013 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Aug 2026 |
1,118 sqft · Built 1937 · 0.18 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $45,000Apr 2004 | Amount on Record May 1998 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Aug 2026 |
0.16 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $695,000Oct 2022 | $13,6592024 | 2 Names on Record Owner Occupied | Assessor + 2 DocumentsUpdated Aug 2026 |
407 sqft · Built 1900 · 0.05 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $293,500Jun 2018 | $4,6192024 | Amount on Record Nov 2005 | 1 Name on Record Owner Occupied | Assessor + 3 DocumentsUpdated Aug 2026 |
0.119 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $489,250Dec 2007 | Amount on Record Aug 1996 | 1 Name on Record Owner Occupied | AssessorUpdated Aug 2026 |
0.139 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $180,000Aug 1995 | 2 Names on Record Owner Occupied | AssessorUpdated Jul 2026 |
1,938 sqft · Built 1900 · 0.25 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $651,000Oct 2021 | $14,1212024 | 2 Names on Record Owner Occupied | Assessor + 2 DocumentsUpdated Aug 2026 |
1,080 sqft · Built 1984 · 0.15 acres · Garage
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $450,000Jan 2021 | $12,8942024 | Amount on Record Jul 2008 | 1 Name on Record Owner Occupied | Assessor + 2 DocumentsUpdated Aug 2026 |
0.23 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 1 Name on Record Owner Occupied | AssessorUpdated May 2026 |
0.339 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $450,000Jun 2004 | Amount on Record Oct 2003 | 1 Name on Record Owner Occupied | AssessorUpdated Aug 2026 |
0.26 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $317,000Oct 2001 | —Dec 1995 | 1 Name on Record Owner Occupied | AssessorUpdated Aug 2026 |
0.25 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| 1 Name on Record Owner Occupied | Assessor + 1 DocumentUpdated Aug 2026 |
0.25 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $10,000Oct 2000 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Aug 2026 |
0.769 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $225,000May 1999 | $21,1012024 | 2 Names on Record Owner Occupied | AssessorUpdated Aug 2026 |
0.839 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $267,500Oct 1995 | 2 Names on Record Owner Occupied | AssessorUpdated Aug 2026 |
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $370,000Oct 2017 | 2 Names on Record | AssessorUpdated Jun 2023 |
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 · 4th in New York |
|---|---|
| Wildfire Likelihood | Low — less than 1 in 10,000 per year |
| Exposure | Direct 2 of 8 cells directly exposed · 6 adjoin burnable vegetation |