Suffolk County  »  11751  »  Harbor Ave  »  21 Harbor Ave

21 Harbor Avenue, Islip, NY 11751 - Property report

Also known as: 21 Harbor Ave

Property image for 21 Harbor Avenue, Islip, NY 11751
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Property type

One Family Year-Round Residence (210)

Year built

1970

Acreage

0.17

Sale price

$549,000

General information

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Access up-to-date information from property owner names to sales history, deeds, tax info, mortgages, development data, planimetric maps and more.

Address
Primary address
21 Harbor Avenue
ZIP code
11751
County
Suffolk
Village (SWIS code)
472889
Parcel ID
396-1-31

Owner

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Sales
Sale date
07/27/2018
Sale price
$549,000
Arm's length
Tax
Tax year
2025-2026
Current property tax
$14,961
Zoning & Use
Zoning
Residential (B)
Building
Property type
One Family Year-Round Residence (210)
Building sq. ft.
2,136
Year built
1970
Lot
Acreage
0.17

Area overview

Walk score
59 /100.  Somewhat Walkable
Transit score
0 /100.  Minimal Transit
Bike score
45 /100.  Somewhat Bikeable
School district
472802

View more such as transportation, nearby schools and risk designations.

Ownership

Ownership information for 21 Harbor Avenue, Islip, NY

Property owner name
Registered owner
Source
Deed
Owner contact information
Phone number
Owner address
Documents

Sales history for 21 Harbor Avenue, Islip, NY 11751

Sale date Sale price Buyer name Seller name
07/27/2018 $549,000 XXXXXX XXXX X; XXXX XXXXXX X XXXXXX XXXXXXXXXXXX X; XXXXXXX XXXXXXXXXXXX X; XX XXXXXXXXXX XXXXXXX X

*Most recent sale on record for this property.

More about Suffolk County property records.

Title documents

Date Type Amount Party 1 Party 2
08/27/2018 - R
07/27/2018 - D		 Deed XXXXXX XXXXXXXXXXXX X XXXX XXXXXX X

*Most recent recorded document on file for this property.

R: Recorded date
D: Document date

Tax

Property taxes for 21 Harbor Avenue, Islip, NY

Property tax data includes tax amount, market value and assessed value, exemptions, abatements and assessment history.

Current property tax
Tax year
2025-2026
Property tax
$14,961
Recent tax assessments
Market value
$667,605
Assessed value
$47,400

More about Suffolk County property taxes

Assessment history

See the assessment and property tax history, including the evolution of the total tax rate and corresponding property tax amount.

Tax year Market value Assessed value Tax rate Property tax Y-o-Y change
2025-2026 $667,605 $47,400 31.564 $14,961 +3.54%
2024-2025 $667,605 $47,400 30.486 $14,450 +3.73%
2023-2024 $651,098 $47,400 29.39 $13,931 +1.68%
2022-2023 $572,463 $47,400 28.904 $13,700 +0.07%
2021-2022 $510,776 $47,400 28.884 $13,691 +3.07%
2020-2021 $488,660 $47,400 28.023 $13,283 -26.94%
2019-2020 $417,621 $47,400 38.357 $18,181 +50.41%
2018-2019 $417,621 $47,400 25.502 $12,088 +0.85%
2017-2018 $391,089 $47,400 25.286 $11,986 -1.55%
2016-2017 $373,228 $47,400 25.684 $12,174 +4.39%
Permits

Permit information for 21 Harbor Avenue, Islip, NY

No recently recorded permits for this property.

Neighborhood

Risk

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FEMA flood zones

FEMA flood zones
X

Transportation

Daily traffic map
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Access the detailed traffic volume map for 21 Harbor Avenue, Islip, NY 11751 to see estimated average daily traffic on streets surrounding the property as well as the types of properties in its vicinity.

Schools

Nearest elementary schools

Name Rating Type Grade range No of students Distance (miles)
Maud S Sherwood Elementary School 6 Public 2-5 335 0.48
Woodhull School NR Public PK, K-6 34 1.15
Woodhull School NR Public PK, K-6 34 1.15
Wing Elementary School NR Public K-1 379 1.30
St Mary School NR Private PK-8 413 1.32
St Mary School NR Private PK-8 413 1.32
St Patrick School NR Private PK-8 534 1.37
St Patrick School NR Private PK-8 534 1.37
Commack Road Elementary School 3 Public 2-5 397 1.45
Brook Avenue Elementary School NR Public K-2 400 1.48
Nearest middle schools

Name Rating Type Grade range No of students Distance (miles)
Islip Middle School 4 Public 6-8 641 0.37
St Mary School NR Private PK-8 413 1.32
St Patrick School NR Private PK-8 534 1.37
Bay Shore Middle School 5 Public 6-8 1,298 2.03
East Islip Middle School 6 Public 6-8 804 2.67
St Peters By The Sea Episcopal Day School NR Private PK, K-8 176 3.08
South Middle School 3 Public 6-8 1,033 3.38
MDQ Academy NR Private PK-12 412 3.61
Bridges Academy (The) NR Private PK-8 211 4.08
East Middle School 4 Public 6-8 1,159 4.10
Nearest high schools

Name Rating Type Grade range No of students Distance (miles)
Islip High School 9 Public 9-12 892 0.45
Bay Shore Senior High School 5 Public 9-12 1,910 1.84
East Islip High School 8 Public 9-12 1,145 2.72
MDQ Academy NR Private PK-12 412 3.61
Brentwood High School 3 Public 9-12 4,641 3.87
St John The Baptist Diocesan High School NR Private 9-12 1,335 4.24
West Islip Senior High School 9 Public 9-12 1,262 4.55
Freshman Center NR Public 9 1,247 4.91
Connetquot Alternative Preschool At Premm NR Public 0 5.04
Central Islip Senior High School 3 Public 9-12 2,576 5.18

Data provided by GreatSchools.org © 2026. All rights reserved.

Neighbors for 21 Harbor Avenue, Islip, NY

15 Harbor Ave, Islip 7 Orowoc Dr, Islip 9 Doxsee Pl, Islip 44 Raymond St, Islip 120 Ocean Ave, Islip 10 Harbor Ave, Islip 40 Raymond St, Islip 32 Harbor Ave, Islip 51 Marvin Ln, Islip 2 Harbor Ave, Islip 21 Orowoc Ave, Islip 25 Harbor Ave, Islip 54 Ocean Ave, Islip 55 Marvin Ln, Islip 15 Orowoc Dr, Islip 11 Allens Point Rd, Bay Shore 3 Harbor Ave, Islip 4 Doxsee Pl, Islip 5 Doxsee Pl, Islip 40 Ocean Ave, Islip

Nearby ZIP codes for 21 Harbor Avenue, Islip, NY

11702, Suffolk County, NY 11703, Suffolk County, NY 11706, Suffolk County, NY 11716, Suffolk County, NY 11717, Suffolk County, NY 11718, Suffolk County, NY 11722, Suffolk County, NY 11725, Suffolk County, NY 11729, Suffolk County, NY 11730, Suffolk County, NY 11739, Suffolk County, NY 11749, Suffolk County, NY 11752, Suffolk County, NY 11769, Suffolk County, NY 11770, Suffolk County, NY 11779, Suffolk County, NY 11787, Suffolk County, NY 11788, Suffolk County, NY 11795, Suffolk County, NY 11796, Suffolk County, NY

Frequently asked questions

What is the year built for 21 Harbor Avenue, Islip, NY 11751?

The development at 21 Harbor Avenue, Islip, NY 11751 was built in 1970.

What is the total square footage of 21 Harbor Avenue, Islip, NY 11751?

21 Harbor Avenue, Islip, NY 11751 has a total of 2,136 square feet.

When was 21 Harbor Avenue, Islip, NY 11751 last sold and what was the sale price?

21 Harbor Avenue, Islip, NY 11751 was last sold on 07/27/2018 for $549,000.

What is the assessed value of 21 Harbor Avenue, Islip, NY 11751?

21 Harbor Avenue, Islip, NY 11751 is currently assessed at $47,400.

What are the property taxes for 21 Harbor Avenue, Islip, NY 11751?

The property taxes for 21 Harbor Avenue, Islip, NY 11751 total $14,961.

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