Suffolk County  »  11751  »  William Ave  »  15 William Ave

15 William Avenue, Islip, NY 11751 - Property report

Also known as: 15 William Ave

Property image for 15 William Avenue, Islip, NY 11751
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Property type

One Family Year-Round Residence (210)

Year built

1968

Acreage

0.12

Sale price

$480,000

General information

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Address
Primary address
15 William Avenue
ZIP code
11751
County
Suffolk
Village (SWIS code)
472889
Parcel ID
320-1-71

Owner

Find out who owns 15 William Avenue, Islip, NY 11751. Uncover corporate and individual owners with a free account.

Sales
Sale date
06/24/2019
Sale price
$480,000
Arm's length
Tax
Tax year
2025-2026
Current property tax
$12,468
Zoning & Use
Zoning
Residential (B)
Building
Property type
One Family Year-Round Residence (210)
Building sq. ft.
2,026
Year built
1968
Lot
Acreage
0.12

Area overview

Walk score
72 /100.  Very Walkable
Transit score
0 /100.  Minimal Transit
Bike score
59 /100.  Bikeable
School district
472802

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

Ownership

Ownership information for 15 William Avenue, Islip, NY

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

Sales history for 15 William Avenue, Islip, NY 11751

Sale date Sale price Buyer name Seller name
06/24/2019 $480,000 XXXXXX XXXXXXXX X; XXXX XXXX X XXXXXXXXX XXXXX; XXXXXXX XXXXX X
03/13/2017 $400,000 XXXXXXXXX XXXXX; XXXXXXX XXXXX XXXXXX XXXXXXXXXX XXX
08/22/2016 $214,000 XXXXXX XXXXXXXXXX XXX XXXXXXX XXXXX X

*Most recent sales on record for this property.

More about Suffolk County property records.

Title documents

Date Type Amount Party 1 Party 2
07/02/2019 - R
06/24/2019 - D		 Deed
(Bargain and sale)		 XXXXXXXXX XXXXX XXXXXX XXXXXXXX X
04/06/2017 - R
03/13/2017 - D		 Deed
(Bargain and sale)		 XXXXXX XXXXXXXXXX XXX XXXXXXXXX XXXXX
09/23/2016 - R
08/22/2016 - D		 Deed
(Executor)		 XXXXXXX XXXXX X XXXXXX XXXXXXXXXX XXX

*Most recent recorded documents on file for this property.

R: Recorded date
D: Document date

Tax

Property taxes for 15 William 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
$12,468
Recent tax assessments
Market value
$556,338
Assessed value
$39,500

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 $556,338 $39,500 31.564 $12,468 +3.54%
2024-2025 $556,338 $39,500 30.486 $12,042 +3.73%
2023-2024 $542,582 $39,500 29.39 $11,609 +1.68%
2022-2023 $477,053 $39,500 28.904 $11,417 +0.07%
2021-2022 $425,646 $39,500 28.884 $11,409 +3.07%
2020-2021 $407,216 $39,500 28.023 $11,069 -26.94%
2019-2020 $348,018 $39,500 38.357 $15,151 +50.41%
2018-2019 $348,018 $39,500 25.502 $10,073 +7.52%
2017-2018 $305,693 $37,050 25.286 $9,368 -1.55%
2016-2017 $291,732 $37,050 25.684 $9,516 +4.39%
Permits

Permit information for 15 William 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 15 William 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)
Wing Elementary School NR Public K-1 379 0.23
Commack Road Elementary School 3 Public 2-5 397 0.76
St Mary School NR Private PK-8 413 0.93
St Mary School NR Private PK-8 413 0.93
Maud S Sherwood Elementary School 6 Public 2-5 335 1.32
John F Kennedy Elementary School 5 Public 3-5 450 1.53
Chatterbox Day School NR Private PK-1 61 1.59
Chatterbox Day School NR Private PK-1 61 1.59
Chatterbox Day School NR Private PK, K-1 0 1.60
Ruth C Kinney Elementary School 7 Public 3-5 302 1.75
Nearest middle schools

Name Rating Type Grade range No of students Distance (miles)
Islip Middle School 4 Public 6-8 641 0.89
St Mary School NR Private PK-8 413 0.93
St Patrick School NR Private PK-8 534 1.62
East Islip Middle School 6 Public 6-8 804 1.69
Bay Shore Middle School 5 Public 6-8 1,298 2.21
South Middle School 3 Public 6-8 1,033 2.91
MDQ Academy NR Private PK-12 412 2.98
East Middle School 4 Public 6-8 1,159 3.32
Our Lady Of Providence Regional School NR Private PK-8 251 3.46
St Peters By The Sea Episcopal Day School NR Private PK, K-8 176 4.03
Nearest high schools

Name Rating Type Grade range No of students Distance (miles)
Islip High School 9 Public 9-12 892 0.83
East Islip High School 8 Public 9-12 1,145 1.71
Bay Shore Senior High School 5 Public 9-12 1,910 2.33
MDQ Academy NR Private PK-12 412 2.98
Brentwood High School 3 Public 9-12 4,641 3.41
Central Islip Senior High School 3 Public 9-12 2,576 4.19
Connetquot Alternative Preschool At Premm NR Public 0 4.37
Freshman Center NR Public 9 1,247 4.45
Connetquot High School 8 Public 9-12 1,757 4.92
St John The Baptist Diocesan High School NR Private 9-12 1,335 5.19

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

Neighbors for 15 William Avenue, Islip, NY

16 Robbins Ave, Islip 11 Bittermint St, Islip 14 W Hemlock St, Islip 96 Elm St, Islip 37 William Ave, Islip 23 Robbins Ave, Islip 6 W Hemlock St, Islip 8 W Spruce St, Islip 12 W Hemlock St, Islip 30 Robbins Ave, Islip 17 Jenkins St, Islip 19 Jenkins St, Islip 92 Elm St, Islip 48 Ferndale Blvd, Islip 11 W Hemlock St, Islip 210 Islip Ave, Islip 26 Robbins Ave, Islip 5 W Oak St, Islip 3 W Oak St, Islip 11 William Ave, Islip

Nearby ZIP codes for 15 William 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 15 William Avenue, Islip, NY 11751?

The development at 15 William Avenue, Islip, NY 11751 was built in 1968.

What is the total square footage of 15 William Avenue, Islip, NY 11751?

15 William Avenue, Islip, NY 11751 has a total of 2,026 square feet.

When was 15 William Avenue, Islip, NY 11751 last sold and what was the sale price?

15 William Avenue, Islip, NY 11751 was last sold on 06/24/2019 for $480,000.

What is the assessed value of 15 William Avenue, Islip, NY 11751?

15 William Avenue, Islip, NY 11751 is currently assessed at $39,500.

What are the property taxes for 15 William Avenue, Islip, NY 11751?

The property taxes for 15 William Avenue, Islip, NY 11751 total $12,467.

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