| Primary address | 9 William Street, Central Islip |
| Zip code | 11722 |
| County | Suffolk |
| Municipality | Islip |
| Parcel ID | 99-2-28 |
View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.
| Sale date | 05/11/2001 |
| Sale price | $123,000 |
| Arm's length | Register |
| Current property tax | $6,394 |
| Building class | One Family Year-Round Residence (210) |
| Acreage | 0.14 |
| 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:
Assessed at $23,900, the tax amount paid for 9 William Street, Central Islip, NY 11722 is $7,284.
When was 9 William Street, Central Islip, NY 11722 last sold?9 William Street, Central Islip, NY 11722 was last sold in 07/19/2022.
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 9 William Street, Central Islip, including title documents, transfer conditions, mortgages and liens.
| Purchase date | Purchase price | Buyer name | Seller name |
|---|---|---|---|
| 05/11/2001 | $123,000 | 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 9 William Street, Central Islip, NY 11722. Tax information included: property tax, market value and assessed value, exemptions, abatements, and assessment history.
| Tax year | 2025-2026 |
| Base tax | $7,285 |
| Current property tax | $6,394 |
| Market value | $336,620 |
| Assessed value | $23,900 |
Here's the assessment & property tax history for 9 William Street, 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 | $336,620 | $23,900 | 29.569 | $7,067 | +5.71% |
| 2023-2024 | $328,296 | $23,900 | 27.973 | $6,686 | -1.12% |
| 2022-2023 | $288,647 | $23,900 | 28.29 | $6,761 | +0.97% |
| 2021-2022 | $257,543 | $23,900 | 28.019 | $6,697 | -2.89% |
| 2020-2021 | $246,392 | $23,900 | 28.854 | $6,896 | +3.66% |
The complete history of permits filed for 9 William Street, 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 9 William Street, 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 9 William Street, 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 | 0.14 |
| Francis J O Neill School | 5 | Public | K-6 | 614 | 0.28 |
| Our Lady Of Providence Regional School | NR | Private | PK-8 | 251 | 0.54 |
| Our Lady Of Providence Regional School | NR | Private | PK-8 | 251 | 0.54 |
| Anthony Alfano Elementary School | 5 | Public | PK, K-6 | 586 | 0.56 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Ralph Reed School | 3 | Public | 7-8 | 1,149 | 0.39 |
| Our Lady Of Providence Regional School | NR | Private | PK-8 | 251 | 0.54 |
| Gersh Academy | NR | Private | 6-12 | 0 | 1.58 |
| Hauppauge Middle School | 6 | Public | 6-8 | 748 | 2.17 |
| East Middle School | 4 | Public | 6-8 | 1,159 | 2.19 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Central Islip Senior High School | 3 | Public | 9-12 | 2,576 | 0.67 |
| Gersh Academy | NR | Private | 6-12 | 0 | 1.58 |
| Hauppauge High School | 9 | Public | 9-12 | 1,079 | 2.03 |
| MDQ Academy | NR | Private | PK-12 | 412 | 2.83 |
| East Islip High School | 8 | Public | 9-12 | 1,145 | 3.03 |
Data provided by GreatSchools.org © 2025. All rights reserved.
Here are the neighbors for 9 William Street, Central Islip.
| Address | Square feet | Purchase date | Purchase price |
|---|---|---|---|
| 99 Casement Ave, Central Islip | 05/21/2001 | $94,000 | |
| 14 Mina Rd, Oakdale | 1,184 | 01/12/2022 | $420,000 |
| 24 Kent CT, West Islip | 07/10/2024 | $815,000 | |
| 2 Grace CT, Bay Shore | 2,698 | 01/27/2023 | $750,000 |
| 376 Islip Ave, Islip | 08/28/2012 | $95,000 | |
| 55 Harvard St, Islip | 1,790 | 04/05/2018 | $486,000 |
| 83 2nd St, Brentwood | 05/15/2001 | ||
| 785 Johnson Ave, Ronkonkoma | 2,376 | 12/20/2021 | $590,000 |
| 52 Gloria Blvd, Hauppauge | 06/01/2001 | ||
| 1562 Lincoln Ave, Bohemia | 12/12/2012 | $511,500 | |
| 20 Newton Pl, Hauppauge | 20,815 | 05/22/2001 | $960,000 |
| 32 Deepdale Dr, Brentwood | 07/29/2014 | $255,460 | |
| 209 Pleasant Dr, Bay Shore | 1,890 | 09/08/2025 | $730,000 |
| 12 Dietz St, Central Islip | 1,183 | 04/14/2020 | $295,000 |
| 175 Dakota St, Ronkonkoma | 02/11/2002 | $255,000 | |
| 68 Toomey Rd, West Islip | 10/21/2003 | ||
| 3170 Veterans Memorial Hwy, Bohemia | 02/10/2026 | $825,000 | |
| 275 S Gillette Ave, Bayport | 2,846 | 04/27/2018 | $650,000 |
| 914 Maple St, Bohemia | 10/24/2001 | $160,000 | |
| 1646 Washington Ave, Bohemia | 04/27/2001 |