| Primary address | 21 Ontario Avenue, Plainview |
| Zip code | 11803 |
| County | Nassau |
| Town/City | Oyster Bay |
| Village (swiss code) | None (unincorporated town) |
| Parcel ID | 12-9-62 |
View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.
| Building sqft | 2,143 |
| Building class | One Family Year - Round Residence (210.01) |
| Land | Primary site |
| Topography | Level |
| Acreage | 0.142 |
| Buildings on lot | 1 |
| Year built | 1952 |
| Stories | 1.7 |
| Style | Cape |
| Rooms | 8 |
| Bathrooms | 3 |
| Attic | None |
| Basement | Full |
| Exterior wall | Alum/Vinyl |
| Heating type | Central/AC |
| Heating system | Central w ac |
| Zoning district | Register (See more on map) |
| School district | Plainview |
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 Ontario Avenue, Plainview, NY 11803 was built in 1952 and has a total of 2,143 square feet.
What is the assessed value of 21 Ontario Avenue, Plainview, NY 11803 and the property tax paid?Assessed at $604, the tax amount paid for 21 Ontario Avenue, Plainview, NY 11803 is $18,457.
When was 21 Ontario Avenue, Plainview, NY 11803 last sold and what was the last sale price?21 Ontario Avenue, Plainview, NY 11803 was last sold in 12/11/2011 for $348,000.
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 21 Ontario Avenue, Plainview, including title documents, transfer conditions, mortgages and liens.
| Purchase date | Purchase price | Buyer name | Seller name |
|---|---|---|---|
| 12/11/2011 | $348,000 | 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 21 Ontario Avenue, Plainview, NY 11803. Tax information included: property tax, market value and assessed value, exemptions, abatements, and assessment history.
| Tax year | 2026 |
| Property tax | $18,458 |
| Tax class | Register |
| Market value | $604,000 |
| Assessed value | $604 |
Here's the assessment & property tax history for 21 Ontario Avenue, Plainview, 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 |
|---|---|---|---|---|---|
| 2026 | $604,000 | $604 | 3055.951 | $18,458 | +2.88% |
| 2025 | $604,000 | $604 | 2970.267 | $17,940 | -1.49% |
| 2024 | $604,000 | $573 | 3178.305 | $18,212 | -5.73% |
| 2023 | $578,000 | $578 | 3342.412 | $19,319 | -13.71% |
| 2022 | $604,000 | $604 | 3706.543 | $22,388 | -12.32% |
The complete history of permits filed for 21 Ontario Avenue, Plainview, 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 Ontario Avenue, Plainview, 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 Ontario Avenue, Plainview 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) |
|---|---|---|---|---|---|
| Our Lady Of Mercy School | NR | Private | PK-8 | 195 | 0.31 |
| Our Lady Of Mercy School | NR | Private | PK-8 | 195 | 0.31 |
| Stratford Road School | 9 | Public | K-4 | 626 | 0.42 |
| Woodland Avenue School | 6 | Public | PK, K-5 | 349 | 0.59 |
| Woodland Avenue School | 6 | Public | PK, K-5 | 349 | 0.59 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Our Lady Of Mercy School | NR | Private | PK-8 | 195 | 0.31 |
| Plainview Old Bethpage Middle School | 8 | Public | 5-8 | 889 | 1.10 |
| Good Shepherd Lutheran School | NR | Private | 0 | 1.18 | |
| St Ignatius Loyola School | NR | Private | PK, K-8 | 226 | 1.37 |
| Trinity Lutheran School | NR | Private | PK-8 | 196 | 1.57 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Good Shepherd Lutheran School | NR | Private | 0 | 1.18 | |
| Long Island Christian Academy | NR | Private | K-10 | 0 | 1.71 |
| Miss Sue's Nursery School and Kindergarten | NR | Private | 0 | 1.94 | |
| Bethpage Senior High School | 9 | Public | 9-12 | 932 | 1.95 |
| Hicksville High School | 6 | Public | 9-12 | 1,852 | 2.06 |
Data provided by GreatSchools.org © 2025. All rights reserved.
Here are the neighbors for 21 Ontario Avenue, Plainview.
| Address | Square feet | Purchase date | Purchase price |
|---|---|---|---|
| 29 Ontario Ave, Plainview | 1,310 | 05/12/2008 | $406,800 |
| 14 Amby Ave, Plainview | 1,325 | ||
| 3 Ontario Ave, Plainview | 1,419 | 02/21/2002 | |
| 25 Ontario Ave, Plainview | 1,325 | 08/21/2017 | $483,000 |
| 23 Ontario Ave, Plainview | 1,434 | ||
| 28 Amby Ave, Plainview | 1,325 | 10/30/2006 | $530,000 |
| 24 Amby Ave, Plainview | 1,653 | ||
| 81 Parkview St, Plainview | 1,325 | 08/04/2016 | $460,000 |
| 4 Amby Ave, Plainview | 1,325 | 12/16/2024 | |
| 27 Ontario Ave, Hicksville | 1,325 | 07/13/2011 | $415,000 |
| 31 Ontario Ave, Plainview | 2,278 | 02/09/2005 | $480,000 |
| 26 Amby Ave, Plainview | 1,325 | 07/07/2005 | $375,000 |
| 10 Amby Ave, Plainview | 1,725 | ||
| 12 Amby Ave, Plainview | 1,419 | 06/12/1997 | $112,000 |
| 6 Amby Ave, Plainview | 1,725 | ||
| 8 Amby Ave, Plainview | 1,325 | 08/06/2024 | $635,000 |
| 80 Elmwood St, Plainview | 1,461 | 01/09/2026 | $824,000 |
| 82 Parkview St, Plainview | 1,325 | 10/30/2019 | $610,000 |
| 82 Elmwood St, Plainview | 1,325 | ||
| 30 Amby Ave, Plainview | 1,419 | 01/28/2021 | $550,000 |