647 Union Ave
Holtsville, NY 11742
— ba 1,904 sqft Built 1955 Lot 29,621 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 | $1,500 | $330 | $1,830 | $5,734 |
| 2024 | $1,500 | $330 | $1,830 | $5,344 |
| 2023 | $1,500 | $330 | $1,830 | $5,126 |
| 2022 | $1,500 | $330 | $1,830 | $4,909 |
| 2021 | $1,500 | $330 | $1,830 | $4,737 |
| 2020 | $1,500 | $330 | $1,830 | $4,659 |
| 2018 | $1,500 | $330 | $1,830 | $5,194 |
| 2017 | $1,500 | $330 | $1,830 | $5,014 |
| 2016 | $1,500 | $330 | $1,830 | $5,006 |
| 2015 | $1,500 | $330 | $1,830 | $4,851 |
| 2014 | $1,500 | $330 | $1,830 | $4,797 |
| 2013 | $1,500 | $330 | $1,830 | $5,531 |
| 2012 | $1,500 | $330 | $1,830 | $4,644 |
| 2011 | $1,500 | $330 | $1,830 | $4,434 |
| 2010 | $1,500 | $330 | $1,830 | $4,322 |
| 2008 | $1,500 | $330 | $1,830 | $4,172 |
| 2007 | $1,500 | $330 | $1,830 | $4,067 |
| 2006 | $1,500 | $330 | $1,830 | $3,944 |
Property facts
Year built
1955
Property type
single_family
Stories
—
Beds
—
Baths
—
Living area
1,904 sqft
Lot size
29,621 sqft
ZIP code
11742
City
Holtsville
Street
Union Ave
Coordinates
40.81456, -73.05802
Comparable properties nearby
Frequently asked questions
When did 647 Union Ave last sell?
No public-record sale is on file for 647 Union Ave.
What is the current tax assessment for 647 Union Ave?
The most recent total assessment for 647 Union Ave (year 2025) is $1,830 with $5,734 in property tax.
When was 647 Union Ave built?
647 Union Ave was built in 1955.
How does 647 Union Ave compare to others on Union Ave?
We track 3 other properties on Union Ave. Browse the list under "Other properties on Union Ave" to compare beds, baths, and sale history.
What are the property facts for 647 Union Ave?
647 Union Ave is a — bath, 1,904 sqft, 29,621 sqft lot single_family.
Is 647 Union Ave a flip candidate?
No — 647 Union Ave does not appear in our flips dataset.
Is 647 Union Ave a tax-appeal candidate?
No — 647 Union 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
+0.4%
Implied 1-yr
+1.5%
2026 Q2
$540.9K
2026 Q3
$542.9K
ZIP 11742 — Median Price History + Forecast
Explore nearby
Geography
Other properties on Union Ave