| Primary address | 5 William Avenue, Islip |
| Zip code | 11751 |
| County | Suffolk |
| Municipality | Islip |
| Parcel ID | 345-1-6 |
View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.
| Sale date | 03/01/2018 |
| Sale price | $345,000 |
| Arm's length | Register |
| Property tax | $11,710 |
| Building sqft | 1,276 |
| Building class | One Family Year-Round Residence (210) |
| Acreage | 0.34 |
| Year built | 1959 |
| Zoning district | Register |
| School district | Islip |
View more neighborhood information such as transportation, nearby schools and risk designations in the dedicated tab.
Property reports include comprehensive occupancy, improvement and development information (where available).
Create a free account to access valuable data points such as:
5 William Avenue, Islip, NY 11751 was built in 1959 and has a total of 1,276 square feet.
What is the assessed value of 5 William Avenue, Islip, NY 11751 and the property tax paid?Assessed at $37,100, the tax amount paid for 5 William Avenue, Islip, NY 11751 is $11,710.
When was 5 William Avenue, Islip, NY 11751 last sold and what was the last sale price?5 William Avenue, Islip, NY 11751 was last sold in 03/01/2018 for $345,000.
View detailed property contacts like owners, building management, representatives from permits and tenants with a free account.
Create a free account to view the complete sales history for 5 William Avenue, Islip, including title documents, transfer conditions, mortgages and liens.
| Purchase date | Purchase price | Buyer name | Seller name |
|---|---|---|---|
| 03/01/2018 | $345,000 | Register | Register |
To view the complete history of deeds, mortgages, assignments of leases and rents, and more, sign up for free. Available data goes back to 1966.
R: Recorded date
D: Document date
Access detailed property tax data for 5 William Avenue, Islip, NY 11751. Tax information included: property tax, market value and assessed value, exemptions, abatements, and assessment history.
| Tax year | 2025-2026 |
| Property tax | $11,710 |
| Market value | $522,535 |
| Assessed value | $37,100 |
Here's the assessment & property tax history for 5 William Avenue, Islip, including the evolution of the total tax rate and corresponding property tax.
| Year | Market value | Assessment value | Total tax rate | Property tax | Year over year change |
|---|---|---|---|---|---|
| 2025-2026 | $522,535 | $37,100 | 31.564 | $11,710 | +3.54% |
| 2024-2025 | $522,535 | $37,100 | 30.486 | $11,310 | +3.73% |
| 2023-2024 | $509,616 | $37,100 | 29.39 | $10,904 | +4.50% |
| 2022-2023 | $435,990 | $36,100 | 28.904 | $10,434 | +0.07% |
| 2021-2022 | $389,009 | $36,100 | 28.884 | $10,427 | +3.07% |
The complete history of permits filed for 5 William Avenue, Islip, including new construction or demolition permits, plus any work pertaining to plumbing, heating and sprinkler systems is available with a free account. Available data goes back to 1990.
Create a free account to unlock extended information for 5 William Avenue, Islip, including whether it's located in FEMA flood zones, floodways or special flood hazard areas, as well as the Coastal barriers resources system area (COBRA).
| FEMA flood zone(s) | X (See more on map) |
Access the detailed traffic volume map for 5 William Avenue, Islip to see estimated average daily traffic on streets surrounding the property as well as the types of properties in its vicinity.
| View daily traffic map |
| Name | Rating | Type | Grade range | No of students | Distance (miles) |
|---|---|---|---|---|---|
| Wing Elementary School | NR | Public | K-1 | 379 | 0.29 |
| Commack Road Elementary School | 3 | Public | 2-5 | 397 | 0.80 |
| St Mary School | NR | Private | PK-8 | 413 | 0.90 |
| St Mary School | NR | Private | PK-8 | 413 | 0.90 |
| Maud S Sherwood Elementary School | 6 | Public | 2-5 | 335 | 1.27 |
| Name | Rating | Type | Grade range | No of students | Distance (miles) |
|---|---|---|---|---|---|
| Islip Middle School | 4 | Public | 6-8 | 641 | 0.86 |
| St Mary School | NR | Private | PK-8 | 413 | 0.90 |
| St Patrick School | NR | Private | PK-8 | 534 | 1.62 |
| East Islip Middle School | 6 | Public | 6-8 | 804 | 1.71 |
| Bay Shore Middle School | 5 | Public | 6-8 | 1,298 | 2.22 |
| Name | Rating | Type | Grade range | No of students | Distance (miles) |
|---|---|---|---|---|---|
| Islip High School | 9 | Public | 9-12 | 892 | 0.80 |
| East Islip High School | 8 | Public | 9-12 | 1,145 | 1.74 |
| Bay Shore Senior High School | 5 | Public | 9-12 | 1,910 | 2.33 |
| MDQ Academy | NR | Private | PK-12 | 412 | 3.04 |
| Brentwood High School | 3 | Public | 9-12 | 4,641 | 3.45 |
Data provided by GreatSchools.org © 2025. All rights reserved.
Here are the neighbors for 5 William Avenue, Islip.
| Address | Square feet | Purchase date | Purchase price |
|---|---|---|---|
| 53 Darcy Cir, Islip | 01/07/1997 | $192,000 | |
| 516 Moffitt Blvd, Islip | |||
| 131 Darcy Cir, Islip | 10/01/2009 | ||
| 452 Moffitt Blvd, Islip | 1,741 | 06/30/2020 | $375,000 |
| 2729 Union Blvd, Islip | 1,670 | 08/26/2019 | |
| 486 Moffitt Blvd, Islip | |||
| 109 Islip Ave, Islip | 11/12/2002 | ||
| 448 Moffitt Blvd, Islip | 1,519 | 03/05/2018 | |
| 424 Moffitt Blvd, Islip | 07/18/2024 | ||
| 155 Islip Ave, Islip | 47,379 | ||
| 522 Moffitt Blvd, Islip | 11/04/2015 | $222,000 | |
| 526 Moffitt Blvd, Islip | |||
| 179 Islip Ave, Islip | |||
| 20 Jenkins St, Islip | 1,218 | 06/26/2024 | $486,000 |
| 173 Islip Ave, Islip | |||
| 63 Darcy Cir, Islip | |||
| 434 Moffitt Blvd, Islip | 10/03/2013 | ||
| 17 Oak CT, Islip | 778 | 05/29/2020 | $345,000 |
| 369 Moffitt Blvd, Islip | |||
| 35 Darcy Cir, Islip | 2,433 |