21 Washington Ave
East Islip, NY 11730
4 bd 2 ba Built 1928 Lot 7,405 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 | $25,400 | $7,000 | $32,400 | $10,332 |
| 2024 | $25,400 | $7,000 | $32,400 | $9,793 |
| 2023 | $25,400 | $7,000 | $32,400 | $9,793 |
| 2022 | $25,400 | $7,000 | $32,400 | $9,884 |
| 2021 | $25,400 | $7,000 | $32,400 | $9,640 |
| 2020 | $25,400 | $7,000 | $32,400 | $9,567 |
| 2018 | $25,400 | $7,000 | $32,400 | $9,546 |
| 2017 | $25,400 | $7,000 | $32,400 | $9,549 |
| 2016 | $23,200 | $7,000 | $30,200 | $7,775 |
| 2015 | $23,200 | $7,000 | $30,200 | $7,936 |
| 2014 | $23,200 | $7,000 | $30,200 | $8,004 |
| 2013 | $23,200 | $7,000 | $30,200 | $7,911 |
| 2012 | $23,200 | $7,000 | $30,200 | $7,616 |
| 2011 | $23,200 | $7,000 | $30,200 | $7,265 |
| 2010 | $23,200 | $7,000 | $30,200 | $6,888 |
| 2008 | $23,200 | $7,000 | $30,200 | $6,783 |
Property facts
Year built
1928
Property type
single_family
Stories
—
Beds
4
Baths
2
Living area
—
Lot size
7,405 sqft
ZIP code
11730
City
East Islip
Street
Washington Ave
Coordinates
40.74071, -73.19440
Block-level micro-comps
Same street, ±3 house numbers, sold in the last 24 monthsFrequently asked questions
When did 21 Washington Ave last sell?
No public-record sale is on file for 21 Washington Ave.
What is the current tax assessment for 21 Washington Ave?
The most recent total assessment for 21 Washington Ave (year 2025) is $32,400 with $10,332 in property tax.
When was 21 Washington Ave built?
21 Washington Ave was built in 1928.
How does 21 Washington Ave compare to others on Washington Ave?
We track 6 other properties on Washington Ave. Browse the list under "Other properties on Washington Ave" to compare beds, baths, and sale history.
What are the property facts for 21 Washington Ave?
21 Washington Ave is a 4 bed, 2 bath, 7,405 sqft lot single_family.
Is 21 Washington Ave a flip candidate?
No — 21 Washington Ave does not appear in our flips dataset.
Is 21 Washington Ave a tax-appeal candidate?
No — 21 Washington 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
+2.1%
Implied 1-yr
+8.4%
2026 Q3
$806.5K
2026 Q4
$821.5K
ZIP 11730 — Median Price History + Forecast
Explore nearby
Geography
Other properties on Washington Ave