| Primary address | 21 Maddox Avenue, Islip |
| Zip code | 11751 |
| County | Suffolk |
| Municipality | Islip |
| Parcel ID | 343-2-75 |
View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.
| Sale date | 05/02/2019 |
| Sale price | $390,000 |
| Arm's length | Register |
| Property tax | $12,783 |
| Building sqft | 2,189 |
| Building class | Two Family Year-Round Residence (220) |
| Acreage | 0.17 |
| Year built | 1971 |
| Units | 2 |
| 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:
21 Maddox Avenue, Islip, NY 11751 was built in 1971 and has a total of 2,189 square feet.
What is the assessed value of 21 Maddox Avenue, Islip, NY 11751 and the property tax paid?Assessed at $40,500, the tax amount paid for 21 Maddox Avenue, Islip, NY 11751 is $12,783.
When was 21 Maddox Avenue, Islip, NY 11751 last sold and what was the last sale price?21 Maddox Avenue, Islip, NY 11751 was last sold in 05/02/2019 for $390,000.
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 21 Maddox 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 21 Maddox 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 | $12,783 |
| Market value | $570,423 |
| Assessed value | $40,500 |
Here's the assessment & property tax history for 21 Maddox 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 | $570,423 | $40,500 | 31.564 | $12,783 | +3.54% |
| 2024-2025 | $570,423 | $40,500 | 30.486 | $12,347 | +3.73% |
| 2023-2024 | $556,319 | $40,500 | 29.39 | $11,903 | +1.68% |
| 2022-2023 | $489,130 | $40,500 | 28.904 | $11,706 | +0.07% |
| 2021-2022 | $436,422 | $40,500 | 28.884 | $11,698 | +3.07% |
The complete history of permits filed for 21 Maddox 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 21 Maddox 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 21 Maddox 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) |
|---|---|---|---|---|---|
| Commack Road Elementary School | 3 | Public | 2-5 | 397 | 0.75 |
| Wing Elementary School | NR | Public | K-1 | 379 | 0.88 |
| St Patrick School | NR | Private | PK-8 | 534 | 0.89 |
| St Patrick School | NR | Private | PK-8 | 534 | 0.89 |
| Brook Avenue Elementary School | NR | Public | K-2 | 400 | 1.12 |
| Name | Rating | Type | Grade range | No of students | Distance (miles) |
|---|---|---|---|---|---|
| Islip Middle School | 4 | Public | 6-8 | 641 | 0.38 |
| St Patrick School | NR | Private | PK-8 | 534 | 0.89 |
| St Mary School | NR | Private | PK-8 | 413 | 1.51 |
| Bay Shore Middle School | 5 | Public | 6-8 | 1,298 | 1.53 |
| East Islip Middle School | 6 | Public | 6-8 | 804 | 2.44 |
| Name | Rating | Type | Grade range | No of students | Distance (miles) |
|---|---|---|---|---|---|
| Islip High School | 9 | Public | 9-12 | 892 | 0.31 |
| Bay Shore Senior High School | 5 | Public | 9-12 | 1,910 | 1.57 |
| East Islip High School | 8 | Public | 9-12 | 1,145 | 2.46 |
| MDQ Academy | NR | Private | PK-12 | 412 | 2.86 |
| Brentwood High School | 3 | Public | 9-12 | 4,641 | 3.14 |
Data provided by GreatSchools.org © 2025. All rights reserved.
Here are the neighbors for 21 Maddox Avenue, Islip.
| Address | Square feet | Purchase date | Purchase price |
|---|---|---|---|
| 31 Walbridge Ave, Bay Shore | 09/22/2023 | $10 | |
| 86 Massachusetts Ave, Bay Shore | 3,052 | 11/08/2023 | $582,000 |
| 184 Northfield Rd, Hauppauge | 05/08/2018 | ||
| 5 Bancroft Rd, Bay Shore | 11/30/2004 | $365,000 | |
| 1682 Westwood Blvd, Bay Shore | 10/15/2025 | $705,000 | |
| 957 Smithtown Ave, Bohemia | 1,748 | 09/30/2021 | $496,000 |
| 155 Hilltop Dr, Brentwood | 09/06/1996 | $89,000 | |
| 946 Benedict St, Bohemia | 02/25/2010 | $320,000 | |
| 300 Johnson Ave, Ronkonkoma | 08/09/1996 | ||
| 60 Birchdale Dr, Holbrook | 05/28/2008 | $395,000 | |
| 50 Mississippi Ave, Bay Shore | 08/28/2025 | $610,715 | |
| 2810 Pond Rd, Ronkonkoma | 08/01/2025 | $465,000 | |
| 6 Marlon Ln, Hauppauge | 2,786 | 10/02/2017 | $599,000 |
| 45 Fran St, Brentwood | 01/19/2012 | $249,100 | |
| 16 Stepney Ln, Brentwood | 10/12/2006 | ||
| 179 Gerritsen Ave, Bayport | 09/06/1996 | $210,000 | |
| 138 Dakota St, Ronkonkoma | 856 | 11/04/2021 | $175,000 |
| 98 Benson Ave, Sayville | 08/29/1996 | $335,000 | |
| 193 Locust Dr, Bay Shore | 10/20/2016 | $304,220 | |
| 44 Arkansas Ave, Bay Shore | 11/01/2024 |