| Primary address | 66 William Avenue, Central Islip |
| Zip code | 11722 |
| County | Suffolk |
| Municipality | Islip |
| Parcel ID | 99-1-57 |
View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.
| Sale date | 09/22/2017 |
| Sale price | $281,000 |
| Arm's length | Register |
| Property tax | $10,836 |
| Building sqft | 1,821 |
| Building class | Two Family Year-Round Residence (220) |
| Acreage | 0.2 |
| Year built | 1957 |
| Units | 2 |
| Zoning district | Register |
| School district | Central 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:
66 William Avenue, Central Islip, NY 11722 was built in 1957 and has a total of 1,821 square feet.
What is the assessed value of 66 William Avenue, Central Islip, NY 11722 and the property tax paid?Assessed at $35,550, the tax amount paid for 66 William Avenue, Central Islip, NY 11722 is $10,835.
When was 66 William Avenue, Central Islip, NY 11722 last sold and what was the last sale price?66 William Avenue, Central Islip, NY 11722 was last sold in 09/22/2017 for $281,000.
How many residential units does this building have?This building has 2 residential unit(s).
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 66 William Avenue, Central Islip, including title documents, transfer conditions, mortgages and liens.
*Here are the three most recent sales for this property.
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 66 William Avenue, Central Islip, NY 11722. Tax information included: property tax, market value and assessed value, exemptions, abatements, and assessment history.
| Tax year | 2025-2026 |
| Property tax | $10,836 |
| Market value | $500,704 |
| Assessed value | $35,550 |
Here's the assessment & property tax history for 66 William Avenue, Central 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 | $500,704 | $35,550 | 29.569 | $10,512 | +5.71% |
| 2023-2024 | $488,324 | $35,550 | 27.973 | $9,944 | -1.12% |
| 2022-2023 | $429,348 | $35,550 | 28.29 | $10,057 | +0.97% |
| 2021-2022 | $383,082 | $35,550 | 28.019 | $9,961 | -2.89% |
| 2020-2021 | $366,495 | $35,550 | 28.854 | $10,258 | +3.66% |
The complete history of permits filed for 66 William Avenue, Central 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 66 William Avenue, Central 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 66 William Avenue, Central 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) |
|---|---|---|---|---|---|
| Charles A Mulligan School | 4 | Public | K-6 | 981 | 0.23 |
| Francis J O Neill School | 5 | Public | K-6 | 614 | 0.43 |
| Anthony Alfano Elementary School | 5 | Public | PK, K-6 | 586 | 0.49 |
| Anthony Alfano Elementary School | 5 | Public | PK, K-6 | 586 | 0.49 |
| Our Lady Of Providence Regional School | NR | Private | PK-8 | 251 | 0.62 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Ralph Reed School | 3 | Public | 7-8 | 1,149 | 0.32 |
| Our Lady Of Providence Regional School | NR | Private | PK-8 | 251 | 0.62 |
| Gersh Academy | NR | Private | 6-12 | 0 | 1.48 |
| Hauppauge Middle School | 6 | Public | 6-8 | 748 | 2.02 |
| East Middle School | 4 | Public | 6-8 | 1,159 | 2.16 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Central Islip Senior High School | 3 | Public | 9-12 | 2,576 | 0.53 |
| Gersh Academy | NR | Private | 6-12 | 0 | 1.48 |
| Hauppauge High School | 9 | Public | 9-12 | 1,079 | 1.88 |
| MDQ Academy | NR | Private | PK-12 | 412 | 2.82 |
| Connetquot High School | 8 | Public | 9-12 | 1,757 | 3.16 |
Data provided by GreatSchools.org © 2025. All rights reserved.
Here are the neighbors for 66 William Avenue, Central Islip.
| Address | Square feet | Purchase date | Purchase price |
|---|---|---|---|
| 2 Hawthorne Ave, Central Islip | 1,889 | 07/24/2017 | $339,200 |
| 11 Weeks Ave, Central Islip | |||
| 4 Pineville Rd, Central Islip | 02/02/2020 | ||
| 38 William Ave, Central Islip | 02/26/2019 | $125,000 | |
| 5159 Hawthorne Ave, Central Islip | 09/14/2018 | $463,000 | |
| 12 A Weeks Ave, Central Islip | |||
| 31 Pineville Rd, Central Islip | 11/25/2014 | $231,610 | |
| 18 Pineville Rd, Central Islip | 11/09/2011 | $140,000 | |
| 10 Pineville Rd, Central Islip | |||
| 60 E Suffolk Ave, Central Islip | 10/11/2024 | $435,000 | |
| 90 Suffolk Ave, Central Islip | 03/09/2023 | ||
| 24 Pineville Rd, Central Islip | |||
| 4 Weeks Ave, Central Islip | 09/07/2023 | ||
| 14 Weeks Ave, Central Islip | 931 | 07/22/2020 | $286,200 |
| 29 A Pineville Rd, Central Islip | |||
| 92 E Suffolk Ave, Central Islip | 2,800 | 01/10/2022 | $800,000 |
| 10 William St, Central Islip | 12/05/2023 | ||
| 25 Weeks Ave, Central Islip | |||
| 15 Weeks Ave, Central Islip | 2,778 | 04/01/2019 | $392,000 |
| 26 Hawthorne Ave, Central Islip | 03/26/2010 |