| Primary address | 129 Union Avenue, Islip |
| Zip code | 11751 |
| County | Suffolk |
| Municipality | Islip |
| Parcel ID | 396-5-5 |
View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.
| Sale date | 05/20/2005 |
| Sale price | $410,000 |
| Arm's length | Register |
| Current property tax | $13,461 |
| Building class | One Family Year-Round Residence (210) |
| Acreage | 0.24 |
| 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 $45,500, the tax amount paid for 129 Union Avenue, Islip, NY 11751 is $14,361.
When was 129 Union Avenue, Islip, NY 11751 last sold and what was the last sale price?129 Union Avenue, Islip, NY 11751 was last sold in 05/20/2005 for $410,000.
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 129 Union Avenue, 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 129 Union 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 | $14,362 |
| Current property tax | $13,461 |
| Market value | $640,846 |
| Assessed value | $45,500 |
Here's the assessment & property tax history for 129 Union 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 | $640,846 | $45,500 | 31.564 | $14,362 | +3.54% |
| 2024-2025 | $640,846 | $45,500 | 30.486 | $13,871 | +3.73% |
| 2023-2024 | $625,000 | $45,500 | 29.39 | $13,372 | +1.68% |
| 2022-2023 | $549,517 | $45,500 | 28.904 | $13,151 | +0.07% |
| 2021-2022 | $490,302 | $45,500 | 28.884 | $13,142 | +3.07% |
The complete history of permits filed for 129 Union 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 129 Union 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 129 Union 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) |
|---|---|---|---|---|---|
| Maud S Sherwood Elementary School | 6 | Public | 2-5 | 335 | 0.44 |
| St Mary School | NR | Private | PK-8 | 413 | 0.88 |
| St Mary School | NR | Private | PK-8 | 413 | 0.88 |
| Wing Elementary School | NR | Public | K-1 | 379 | 1.12 |
| John F Kennedy Elementary School | 5 | Public | 3-5 | 450 | 1.30 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Islip Middle School | 4 | Public | 6-8 | 641 | 0.64 |
| St Mary School | NR | Private | PK-8 | 413 | 0.88 |
| St Patrick School | NR | Private | PK-8 | 534 | 1.71 |
| East Islip Middle School | 6 | Public | 6-8 | 804 | 2.30 |
| Bay Shore Middle School | 5 | Public | 6-8 | 1,298 | 2.37 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Islip High School | 9 | Public | 9-12 | 892 | 0.67 |
| Bay Shore Senior High School | 5 | Public | 9-12 | 1,910 | 2.25 |
| East Islip High School | 8 | Public | 9-12 | 1,145 | 2.37 |
| MDQ Academy | NR | Private | PK-12 | 412 | 3.71 |
| Brentwood High School | 3 | Public | 9-12 | 4,641 | 4.04 |
Data provided by GreatSchools.org © 2025. All rights reserved.
Here are the neighbors for 129 Union Avenue, Islip.
| Address | Square feet | Purchase date | Purchase price |
|---|---|---|---|
| 1638 N Gardiner Dr, Bay Shore | 950 | 07/24/2023 | |
| 132 Fairview Ave, Bayport | 2,818 | 08/01/2019 | $565,000 |
| 2568 Motor Pkwy, Ronkonkoma | 05/12/2006 | $385,000 | |
| 152 Merrill St, Brentwood | 04/27/2001 | $90,000 | |
| 146 Marilynn St, East Islip | 1,976 | 06/04/2018 | |
| 1194 Howells Rd, Bay Shore | 10/20/2023 | $15,150 | |
| 37 W White St, Brentwood | 08/22/2013 | $160,000 | |
| 166 Nimbus Rd, Holbrook | 1,324 | 02/26/2021 | $400,000 |
| 6 Beaulieu CT, Bay Shore | 04/23/2001 | $165,000 | |
| 63 Meadow Ln, Bayport | 05/31/2012 | $595,000 | |
| 1 Zoe CT, Bay Shore | 02/14/2025 | ||
| 133 Connetquot Dr, Oakdale | 05/03/2001 | $270,000 | |
| 8 Tern CT, Bay Shore | 4,990 | 10/28/2020 | $1,100,000 |
| 90 Atlantic Ave, West Sayville | 05/04/2001 | $210,000 | |
| 204 Pleasant Dr, Bay Shore | 1,854 | 10/24/2023 | |
| 623 Montauk Hwy, West Islip | 09/14/2001 | $142,500 | |
| 511 Wicks Rd, Brentwood | 880 | 02/10/2023 | |
| 12 Savoy Ave, Bay Shore | 2,736 | 04/11/2022 | $360,000 |
| 251 Secatogue Ln, West Islip | 04/13/2018 | ||
| 77 Cherry Ave, West Sayville | 05/21/2001 |