91 Union Avenue, Islip, NY 11751
OFF MARKET

$785,000

Trulia Estimate
  • 4 Beds
  • 2 Baths
  • 2,481 sqft

91 Union Avenue, Islip, NY 11751

Est. Refi. Payment $5,250/mo*
Refinance Your Home
Currently Off Market - Sold Oct 22, 2025 for $750,000

Home Value

Learn more about this home's value by checking out the value of nearby homes and how much similar homes have sold for.

Comparable sales

These are recently sold homes that have a similar location or other similar features to this home, like bedrooms, bathrooms, and square footage. Get a sense of the expected prices in the area by viewing these homes.
Address
Distance
Property Type
Sold Price
Sold Date
Bed
Bath
Sqft
46 Monell Avenue, Islip, NY
0.14
Single-Family Home
$821,000
06/29/26
5
2
2,700
47 Smith Avenue, Islip, NY
0.16
Single-Family Home
$800,000
05/21/26
4
2
2,128
53 Church Avenue, Islip, NY
0.20
Single-Family Home
$698,000
10/01/25
4
2
1,937
77 Church Avenue, Islip, NY
0.19
Single-Family Home
$735,000
10/10/25
4
2.5
2,500
71 Willow Avenue, Islip, NY
0.08
Single-Family Home
$800,000
02/02/26
3
1.5
2,172
151 Church Avenue, Islip, NY
0.28
Single-Family Home
$950,000
07/13/26
4
2
2,450
155 Smith Avenue, Islip, NY
0.21
Single-Family Home
$690,000
07/22/26
4
2
2,100
117 Union Avenue, Islip, NY
0.06
Single-Family Home
$867,000
03/02/26
3
2.5
2,415
57 Wave Crest Drive, Islip, NY
0.27
Single-Family Home
$765,000
03/27/26
4
1.5
1,358

Nearby home prices

Get a sense of expected prices in the area by checking the value of nearby homes.
Address
Distance
Price
Bed
Bath
Sqft
Status
117 Union Avenue, Islip, NY 11751
0.06
$867,000
3
2.5
2,415
Recently Sold
110 S Bay Avenue, Islip, NY 11751
0.08
$963,100
4
3
2,734
Off Market
65 Willow Avenue, Islip, NY 11751
0.08
$939,700
3
2
-
Off Market
71 Willow Avenue, Islip, NY 11751
0.08
$800,000
3
1.5
2,172
Recently Sold
149 Union Avenue, Islip, NY 11751
0.15
$685,000
3
1
1,539
Recently Sold
13 1st Street, Islip, NY 11751
0.13
$717,900
3
2.5
1,342
Off Market
136 Monell Avenue, Islip, NY 11751
0.15
$804,600
5
3
2,212
Off Market
199 Raymond Street, Islip, NY 11751
0.13
$817,000
3
2
2,372
Off Market
11 Shebar Drive, Islip, NY 11751
0.18
$1,081,800
4
3
2,600
Off Market
161 S Bay Avenue, Islip, NY 11751
0.18
$847,200
3
2
1,950
Off Market
174 S Bay Avenue, Islip, NY 11751
0.19
$1,116,400
4
2.5
2,961
Off Market

Local Information

  • Map ViewExplore the area around 91 Union Avenue.
  • Schools3 Elementary Schools1 Middle School1 High School
  • Shop & Eat
-- mins to
Commute Destination

Home Highlights

Property Type
Single-Family Home
Year Built
1870
Living Area
2,481 sqft
Price/Sqft
$316
Parking
Garage

About this House

This beautifully restored Colonial is located in a prime residential block, just south of Montauk and in close proximity to the vibrant Main St. area, offering a variety of restaurants, charming boutiques, and local beaches. This home features a bright and open floor plan, with an updated eat-in kitchen and stainless steel appliances. With 4 spacious bedrooms and 2 full baths, this property offers comfort and style. The meticulously maintained grounds include new brick pavers and a charming gazebo, perfect for outdoor relaxation and entertainment. A true gem in a highly desirable area!
91 Union Avenue, Islip, NY 11751 is a 4 bedroom, 2 bathroom, 2,481 sqft single-family home built in 1870. It last sold for $750,000 on Oct 22, 2025 (3% above the $729,999 asking price). This property is not currently displayed as for sale or rent on Trulia. The Trulia Estimate is $785,000, with a rent estimate of $4,457/month.
Last check for updates: about 4 hours ago
Listed by Michael J. Watts
Michael J Watts & Assoc Inc, (631) 650-9933
Bought with: Michael Watts, (631) 786-2676, Michael J Watts & Assoc Inc, (631) 650-9933
Source: OneKey® MLS as distributed by MLS GRID, MLS#836404

Home Details for 91 Union Avenue

Interior Features

Interior Details
Number of Rooms: 7
Beds & Baths
Number of Bedrooms: 4Number of Bathrooms: 2Number of Bathrooms (full): 2
Dimensions and Layout
Living Area: 2481 Square Feet
Appliances & Utilities
Utilities: Electricity Connected, Sewer Connected, Trash Collection Public, Water ConnectedAppliances: Refrigerator, WasherRefrigeratorWasher
Heating & Cooling
Heating: Has Heating Unspecified TypeHas CoolingAir Conditioning: DuctlessHas HeatingHeating Fuel: Has Heating Unspecified Type
Gas & Electric
Has Electric on Property

Exterior Features

Parking & Garage
Number of Garage Spaces: 2Number of Covered Spaces: 2No CarportHas a GarageParking Spaces: 2Parking: Garage
Water & Sewer
Sewer: Public Sewer

Days on Market

Cumulative Days on Market: 18

Property Information

Year Built
Year Built: 1870
Property Type / Style
Property Type: ResidentialProperty Subtype: Single Family Residence, ResidentialArchitecture: Colonial
Building
Construction Materials: CedarNot Attached Property
Property Information
Parcel Number: 0500396000400073000

Price & Status

Price
List Price: $729,999
Status Change & Dates
Off Market Date: Fri Apr 04 2025

Active Status

MLS Status: Sold

Location

Direction & Address
City: Islip
School Information
Elementary School: Maud S Sherwood Elementary SchoolJr High / Middle School: Islip Middle SchoolHigh School: Islip High SchoolHigh School District: Islip

Building

Building Area
Building Area: 2481 Square Feet

Community

Not Senior Community

HOA

No HOA

Lot Information

Lot Area: 9148 sqft

Listing Info

Special Conditions: None

Offer

Listing Agreement Type: Exclusive Right To Sell

Miscellaneous

Mls Number: 836404Attic: WalkupAttribution Contact: 631-650-9933Showing Requirements: Showing Service

Price and Tax history

DateEventPrice
Oct 22, 2025
Source: N/A
Sold
$750,000
Aug 13, 2025
Source: OneKey® MLS as distributed by MLS GRID #836404
Sold
$750,000
Apr 4, 2025
Source: OneKey® MLS as distributed by MLS GRID #836404
Pending
$729,999
Mar 17, 2025
Source: OneKey® MLS as distributed by MLS GRID #836404
Listed For Sale
$729,999
Feb 15, 2016
Source: OneKey® MLS as distributed by MLS GRID #L2807116
Sold
$427,500

Market trends in Islip

Last updated July 2026
Buyer'sMarketSeller'sMarket
Avg. sale price
—
Sale-to-List Price
—
Price per sq ft
—
Available listings
36
6MoM

Around this home

What Locals Say about Islip

At least 118 Trulia users voted on each feature.

  • 90 % Say parking is easy

  • 90 % Say it's dog friendly

  • 88 % Say car is needed

  • 86 % Say there's holiday spirit

  • 85 % Say yards are well-kept

  • 75 % Say people would walk alone at night

  • 73 % Say kids play outside

  • 65 % Say neighbors are friendly

  • 64 % Say it's quiet

  • 63 % Say it's walkable to restaurants

  • 62 % Say streets are well-lit

  • 62 % Say they plan to stay for at least 5 years

  • 59 % Say there are sidewalks

  • 59 % Say it's walkable to grocery stores

  • 59 % Say there's wildlife

  • 49 % Say there are community events

Sourced by Trulia users. Learn more about our methodology.
  • Michellereid2323
    "Family-oriented neighborhood. Main Street is charming, walkable, and dotted with boutiques, cafes, and diners."
    0
    Flag
  • Matt Classie
    "Street fairs, events at Brookwood Hall during holidays. Theres lots to do in the town of Islip. Bats & Brews is a great event."
    0
    Flag
  • Yen160107
    "I have kids that play in the front yard and they step on the dog feces that they left behind. Also I have signs that say “kids at play” but they do not care"
    0
    Flag
  • Trulia User
    "The drive is horrible and the traffic which is 300 feet from your front door is deafening! A ten lane super hwy and that’s what you wake up to at 4:30 am every day ! Or you can take the train a mile away which you can also here every morning blasting it’s way to islip train station . "
    0
    Flag
  • Trulia User
    "Well celebrate almost all the events soccer games good school very friendly neighborhoods good shopping center "
    1
    Flag
  • Jamal G.
    "this neighborhood is a great place to live there are restaurants in the mall nearby good schools and they are also close"
    14
    Flag
  • Stephen B.
    "The taxes are very high here for the school. Bay Shore schools are just as good or better and the taxes are much lower. "
    9
    Flag
  • Michael .
    "Good! I work in the city and take the LIRR. The islip station has free parking and plenty of spaces."
    1
    Flag
  • Monmona
    "you need to have a car to commute around. around. if you live close enough to the Long Island Railroad, then you can walk to the station and take the train from there."
    1
    Flag
  • Fldsetter
    "I grew up here and actually bought my childhood home back after living in another part of the country . Beaches are close , most folks keep there homes well maintained . There are lot of children here and the schools are second to none . I wish the town would replace the roads here , and take better care of there pubic areas ! But let the young folks moving in fight that fight ! "
    1
    Flag
  • Djhafner132
    "5 min to train station.the neighbors are friendly.i am an avid fisherman and two fishing piers are less than a mile away.the streets are well treed and maintained "
    0
    Flag
  • Djhafner132
    "I lived here since 1973.The homes are well kept and neighbors are friendly.the town dock is an easy walk with great fishing the streets are well maintained.All in all a great place to live"
    0
    Flag
  • Djhafner132
    "Parades block parties great fishing close by.great south of montauk location.Great place to raise a family "
    0
    Flag
  • Ricktssf
    "I work locally, so I can walk to work. the train station to NYC is only 4 blocks away. easy commute on the train. "
    2
    Flag
  • G.Greco
    "I've made Islip my home since 1980. Yards are well kept, the streets are maintained, paved and cleaned regularly. The school district is good. It's a good place to live and raise a family. This area south of Montauk is very desirable"
    16
    Flag
  • Tannuramees
    "parades, fairs, shops close by, farmers market, good schools, nice neighborhood, school events, town events"
    1
    Flag
  • Catherine M.
    "I have lived here for 18 years and for the most part it’s a good area. I am not a huge fan of the school district but it’s not horrible either ."
    11
    Flag
  • Stefbartoli
    "Dog friendly neighborhood! People walk their dogs around regularly. Neighbors look out for each other’s pets as well. "
    1
    Flag
  • Tyase930
    "Quiet respectful neighbors. Walking distance to stores. Lots of new businesses and new development s."
    0
    Flag
  • Tony H.
    "I live in this neighborhood for 2 years so far people are very friendly, there's always parking, people walk their dogs at night and exercise regularly. It's pretty cool !!!"
    0
    Flag
  • Fldsetter
    "Crappy roads / rats / compact floresant lights instead of LED ( someone got paid off ) no trees left due to disease , and the town is not planting any ! Highway noise 10 lanes now on Sunrise HWY - RT27 . No plans for a sound wall ??? I guess we are lower class here in Islip . Airplane and helicopters all day and night fly over head ,, isn’t there a bay or ocean they can fly over then go straight up Lakeland Blvd to the airport ???? I will eave as soon as I find a house elsewhere and not in NY "
    0
    Flag
  • Ricktssf
    "I'm 17 years living in Islip. a little great Hamlet along the great South Bay. Town of Islip is much larger, but this is a Suburban area. "
    0
    Flag

LGBTQ Local Legal Protections

Based on information submitted to the MLS GRID as of 2026-08-26 10:13:02 PDT All data is obtained from various sources and may not have been verified by broker or MLS GRID. Supplied Open House Information is subject to change without notice. All information should be independently reviewed and verified for accuracy. Properties may or may not be listed by the office/agent presenting the information. Some IDX listings have been excluded from this website. Click here for more information

Frequently asked questions about 91 Union Avenue

  • What is 91 Union Avenue estimated to be worth?
    Trulia's estimated value for 91 Union Avenue in Islip, NY is $785,000.
  • What is the price history for 91 Union Avenue?
    91 Union Avenue in Islip, NY last sold for $750,000 in October 2025.
  • Is Islip a buyer's or seller's market?
    Islip is currently a seller's market, based on recent for-sale activity.
  • What do residents say about Islip?
    Residents describe Islip, NY as easy to park in, dog-friendly, and well-kept. Most residents say you need a car. See recently sold homes in Islip, NY.
  • Does 91 Union Avenue have air conditioning?
    Yes, 91 Union Avenue in Islip, NY has air conditioning.
  • How big is the lot at 91 Union Avenue?
    The lot at 91 Union Avenue in Islip, NY is about 0.21 acres (9,148 sq ft).

Explore by feature - Air Conditioning

7 rentals with air conditioning in Islip, NY

Explore by feature - Washer/dryer

6 rentals with a washer/dryer in Islip, NY

Apartments for Rent

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Off Market Homes Near 91 Union Avenue

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