| Primary address | 10 William Avenue, Islip |
| Zip code | 11751 |
| County | Suffolk |
| Municipality | Islip |
| Parcel ID | 344-3-7 |
View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.
| Current property tax | $11,535 |
| Building class | One Family Year-Round Residence (210) |
| Acreage | 0.21 |
| 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:
Assessed at $39,400, the tax amount paid for 10 William Avenue, Islip, NY 11751 is $12,436.
When was 10 William Avenue, Islip, NY 11751 last sold?10 William Avenue, Islip, NY 11751 was last sold in 11/14/2005.
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 10 William Avenue, Islip, including title documents, transfer conditions, mortgages and liens.
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 10 William Avenue, Islip, NY 11751. Tax information included: property tax, market value and assessed value, exemptions, abatements, and assessment history.
| Tax year | 2025-2026 |
| Base tax | $12,436 |
| Current property tax | $11,535 |
| Market value | $554,930 |
| Assessed value | $39,400 |
Here's the assessment & property tax history for 10 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 |
|---|---|---|---|---|---|
| 2024-2025 | $554,930 | $39,400 | 30.486 | $12,011 | +3.73% |
| 2023-2024 | $541,209 | $39,400 | 29.39 | $11,580 | +1.68% |
| 2022-2023 | $475,845 | $39,400 | 28.904 | $11,388 | +0.07% |
| 2021-2022 | $424,569 | $39,400 | 28.884 | $11,380 | +3.07% |
| 2020-2021 | $406,186 | $39,400 | 28.023 | $11,041 | -26.94% |
The complete history of permits filed for 10 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 10 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 10 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 to school (mi) |
|---|---|---|---|---|---|
| Wing Elementary School | NR | Public | K-1 | 379 | 0.27 |
| Commack Road Elementary School | 3 | Public | 2-5 | 397 | 0.76 |
| St Mary School | NR | Private | PK-8 | 413 | 0.94 |
| St Mary School | NR | Private | PK-8 | 413 | 0.94 |
| Maud S Sherwood Elementary School | 6 | Public | 2-5 | 335 | 1.28 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Islip Middle School | 4 | Public | 6-8 | 641 | 0.85 |
| St Mary School | NR | Private | PK-8 | 413 | 0.94 |
| St Patrick School | NR | Private | PK-8 | 534 | 1.59 |
| East Islip Middle School | 6 | Public | 6-8 | 804 | 1.73 |
| Bay Shore Middle School | 5 | Public | 6-8 | 1,298 | 2.18 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Islip High School | 9 | Public | 9-12 | 892 | 0.78 |
| East Islip High School | 8 | Public | 9-12 | 1,145 | 1.76 |
| Bay Shore Senior High School | 5 | Public | 9-12 | 1,910 | 2.30 |
| MDQ Academy | NR | Private | PK-12 | 412 | 3.00 |
| Brentwood High School | 3 | Public | 9-12 | 4,641 | 3.41 |
Data provided by GreatSchools.org © 2025. All rights reserved.
Here are the neighbors for 10 William Avenue, Islip.
| Address | Square feet | Purchase date | Purchase price |
|---|---|---|---|
| 196 Academy St, Bayport | 01/22/2014 | ||
| 91 Penney St, West Islip | 2,163 | 03/25/2022 | $679,000 |
| 1114 Nugent Ave, Bay Shore | 10/06/2017 | ||
| 122 Amityville St, Islip Terrace | 02/28/2013 | $345,000 | |
| 11 Waco Ln, Holbrook | 04/25/2001 | ||
| 1640 Spur Dr N, Central Islip | 02/07/2023 | $545,000 | |
| 1278 Minerva Ave, West Islip | 792 | 10/26/2022 | $495,000 |
| 72 Cordello Ave, Central Islip | 05/20/2005 | $340,000 | |
| 543 Bay 5 St, West Islip | 12/23/2024 | $810,000 | |
| 3 Canterbury CT, Oakdale | 2,414 | 01/30/2019 | $460,000 |
| 16 Cloverdale Dr, Oakdale | 3,493 | 07/20/2017 | |
| 18 Poplar Pl, Bay Shore | 05/25/2010 | ||
| 138 Claywood Dr, Brentwood | 05/16/2008 | ||
| 2261 Sycamore Ave, Ronkonkoma | 1,027 | 08/31/2021 | $540,000 |
| 429 Clayton St, Central Islip | 05/23/2013 | ||
| 256 Cherokee St, Ronkonkoma | 632 | 11/05/2018 | $1 |
| 1362 Saxon Ave, Bay Shore | 1,836 | 11/30/2021 | $460,000 |
| 28 Abrew St, Bay Shore | 06/19/2001 | ||
| 91 Storm Dr, Holtsville | 12/06/2011 | ||
| 59 Bushwick Ave, Brentwood | 1,246 | 01/04/2024 |