5 William Ave
Islip, NY 11751
— ba 1,413 sqft Built 1959 Lot 14,810 sqft single_family
No recorded sales
Location
Timeline: Sale, Listing & Tax History
Recorded events
No recorded events
No sale or listing events are on file for this property.
Tax assessment history
| Year | Building | Land | Total assessed | Tax paid |
|---|---|---|---|---|
| 2025 | $29,300 | $7,800 | $37,100 | $12,927 |
| 2024 | $29,300 | $7,800 | $37,100 | $11,949 |
| 2023 | $28,300 | $7,800 | $36,100 | $11,949 |
| 2022 | $28,300 | $7,800 | $36,100 | $11,942 |
| 2021 | $28,300 | $7,800 | $36,100 | $11,552 |
| 2020 | $28,300 | $7,800 | $36,100 | $11,247 |
| 2018 | $28,000 | $7,800 | $35,800 | $10,853 |
| 2017 | $28,000 | $7,800 | $35,800 | $8,371 |
| 2016 | $28,000 | $7,800 | $35,800 | $8,353 |
| 2015 | $28,000 | $7,800 | $35,800 | $8,397 |
| 2014 | $28,000 | $7,800 | $35,800 | $8,274 |
| 2013 | $28,000 | $7,800 | $35,800 | $8,071 |
| 2012 | $28,000 | $7,800 | $35,800 | $7,749 |
| 2011 | $28,000 | $7,800 | $35,800 | $7,435 |
| 2010 | $28,000 | $7,800 | $35,800 | $7,092 |
| 2008 | $28,000 | $7,800 | $35,800 | $6,815 |
Property facts
Year built
1959
Property type
single_family
Stories
—
Beds
—
Baths
—
Living area
1,413 sqft
Lot size
14,810 sqft
ZIP code
11751
City
Islip
Street
William Ave
Coordinates
40.73679, -73.21021
Comparable properties nearby
Frequently asked questions
When did 5 William Ave last sell?
No public-record sale is on file for 5 William Ave.
What is the current tax assessment for 5 William Ave?
The most recent total assessment for 5 William Ave (year 2025) is $37,100 with $12,927 in property tax.
When was 5 William Ave built?
5 William Ave was built in 1959.
How does 5 William Ave compare to others on William Ave?
We track 3 other properties on William Ave. Browse the list under "Other properties on William Ave" to compare beds, baths, and sale history.
What are the property facts for 5 William Ave?
5 William Ave is a — bath, 1,413 sqft, 14,810 sqft lot single_family.
Is 5 William Ave a flip candidate?
No — 5 William Ave does not appear in our flips dataset.
Is 5 William Ave a tax-appeal candidate?
No — 5 William Ave is not currently flagged as a tax-appeal candidate.
Forecast for this area
ZIP-area linear projection — not a per-property automated valuationQuarterly trend
-13.7%
Implied 1-yr
-54.6%
2026 Q1
$212.6K
2026 Q2
$212.6K
ZIP 11751 — Median Price History + Forecast
Explore nearby
Geography
Other properties on William Ave