Suffolk County and Islip Town property records for 24 addresses on Southside Ave, West Islip, NY · Last verified October 2026
| Properties | 24 |
|---|---|
| Median Sale Price | $519,000 |
| Deeds and Mortgages on File | 25 |
| Median Price per Sqft | $399 |
| Owner Occupied | 96% |
| Median Annual Tax Bill | $10,855 |
| Median Year Built | 1952 |
| Median Ownership Tenure | 8 years |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
801 Southside Ave |
0.33 acres | $765,000 Nov 2025 | $11,503 2024 | Assessor + 2 Documents Updated Aug 2026 | Owner on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
802 Southside Ave |
0.369 acres | $169,000 Oct 2001 | $13,077 2024 | Assessor + 1 Document Updated Aug 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
805 Southside Ave |
0.339 acres | Assessor + 2 Documents Updated Aug 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
806 Southside Ave |
0.3 acres | $410,000 Dec 2005 | Assessor + 1 Document Updated Aug 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
809 Southside Ave |
0.339 acres | $290,000 Jun 2013 | $10,996 2024 | Assessor + 2 Documents Updated Aug 2026 | Owner on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
810 Southside Ave |
1,638 sqft built 1952 · 0.3 acres | Assessor Updated Aug 2026 | Owner on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
813 Southside Ave |
1,008 sqft built 1952 · 0.339 acres | $519,000 Apr 2023 | $10,182 2024 | Assessor + 3 Documents Updated Aug 2026 | Owner on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
814 Southside Ave |
0.3 acres | Assessor Updated Aug 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
817 Southside Ave |
1,043 sqft built 1952 · 0.339 acres | $417,000 Nov 2020 | $10,294 2024 | Assessor + 1 Document Updated Aug 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
818 Southside Ave |
1,342 sqft built 1952 · 0.3 acres | $379,000 Jan 2018 | $11,588 2024 | Assessor + 1 Document Updated Aug 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
821 Southside Ave |
0.339 acres | Assessor Updated Aug 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
822 Southside Ave |
0.3 acres | $493,000 Jan 2026 | Assessor + 1 Document Updated Aug 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
825 Southside Ave |
0.339 acres | $200,000 Mar 2001 | $10,855 2024 | Assessor + 1 Document Updated Aug 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
826 Southside Ave |
0.3 acres | $404,000 Nov 2006 | $10,349 2024 | Assessor + 2 Documents Updated Aug 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
829 Southside Ave |
0.339 acres | Assessor Updated Aug 2026 | Owner on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
830 Southside Ave |
0.3 acres | $10,152 2024 | Assessor + 1 Document Updated Aug 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
833 Southside Ave |
0.339 acres | $420,000 Dec 2019 | Assessor + 1 Document Updated Aug 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
834 Southside Ave |
1,352 sqft built 1952 · 0.3 acres | $10,264 2024 | Assessor + 1 Document Updated Aug 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
837 Southside Ave |
0.339 acres | $385,000 Jan 2015 | $9,446 2024 | Assessor Updated Aug 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
838 Southside Ave |
2,235 sqft built 1951 · 0.3 acres | $525,000 Jun 2020 | $14,513 2024 | Assessor + 2 Documents Updated Aug 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
841 Southside Ave |
0.339 acres | — Jun 2012 | Assessor Updated Oct 2026 | Owner on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
842 Southside Ave |
0.3 acres | Assessor Updated Aug 2026 | Owner on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
845 Southside Ave |
0.339 acres | $550,000 Jul 2025 | Assessor + 3 Documents Updated Aug 2026 | 2 Owners on File |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
846 Southside Ave |
0.3 acres | $140,000 May 1994 | Assessor Updated Aug 2026 | 2 Owners on File Owner Occupied |