Nassau County and Oyster Bay Town property record for 18 Knowles St, Plainview, NY 11803
| Property Type | Single Family Home |
|---|---|
| Details | 2 ba · 1,470 sqft · built 1957 |
| Lot Size | 0.22 acres (9,581 sqft) |
| Owner | Individual Name on File |
| Tax Bill | $14,765 (2025) |
| Deeds & Mortgages | Jul 2018 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 12-490-00-0043 |
| Primary APN | 12-490-00-0043 |
|---|---|
| Alternative APNs |
|
| Full Baths | 2 Baths |
|---|---|
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 1,470 sqft Living Area |
| Gross Area | 1,701 sqft |
| 1st Floor Area | 1,470 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1957 |
|---|---|
| Effective Year Built | Effective 1957 |
| Architectural Style | Ranch |
| Exterior Material | Brick |
| Foundation Type | Concrete |
| Roof Material | Other |
| Lot Area | 9,581 sqft (0.22 acres) |
| Lot Dimensions | 149 ft deep x 68 ft wide |
| View / Lot | Commercial/Industrial |
| Garage Type | Attached |
| Garage Area | 231 sqft |
| Parking Spaces | 1 Parking Space |
| Porch | Open Frame Porch |
| Porch Area | 190 sqft |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Heating Fuel | Oil |
| Sewer | Municipal |
| Water Source | Commercial |
| Account Number | 12490 00430 |
|---|---|
| Street Address | 18 KNOWLES ST |
| City | PLAINVIEW |
| State | NY |
| Zip | 11803-3926 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | TOWN #3 SCH DIST 019 |
| Legal Block | 490 |
| Legal Lot Number | 43 |
| Jurisdiction | NASSAU NY |
| Township / Civil Division | OYSTER BAY |
| Census Block Group | 2 |
| Census Block | 2009 |
| Census Tract | 519704 |
18 Knowles St is owned and occupied by an individual.
Source: Nassau County and Oyster Bay Town records, as of October 13, 2026
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 18 KNOWLES ST, PLAINVIEW, NY 11803-3926 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | Name on Deed |
|---|---|
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | NASSAU NY |
| Property Address | 18 KNOWLES ST, PLAINVIEW, NY 11803-3926 |
| Transaction Type | Mortgage |
| Record Updated | Feb 5, 2021 |
| Name | Verified Name |
|---|
| Document Number | 0429650762 |
|---|---|
| Date | Jul 30, 2018 |
| Book Page | 42965/762 |
| Instrument | 2018-066533 |
| Name | JP MORGAN CHASE BANK |
|---|---|
| Type | Bank |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 360 Months |
| Due | Jul 15, 2048 |
| Rate Type | Adjustable Rate |
|---|
The 2025 property tax bill for 18 Knowles St was $14,765 with a senior citizen's exemption.
Source: Nassau County and Oyster Bay Town assessment roll, as of June 17, 2026
| Type | Name |
|---|---|
| State | New York |
| County | Nassau County |
| County Subdivision | Oyster Bay Town |
| Unified School District | Plainview-Old Bethpage Central School District (KG - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $511 Land $310 Building $201 | $511,000 | |
| 2025 | $14,765.00 | ||
| 2023 | $13,233.00 Homeowner's exemption | $574 Land $348 Building $226 | $574,000 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 18 Knowles St in Zone X, an area of minimal flood risk, though there have been 7 flood claims nearby since 1978.
Source: FEMA National Flood Hazard Layer, effective April 5, 2023 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 6 in force |
| Nearby Flood Claims | 7 (1978–2012) |
| Claims Outside the SFHA | 5 of 7 |
| Most Recent Claim | Dec 2012 · rainfall accumulation |
Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.
The area around 18 Knowles St has no burnable land within ember reach, so its wildfire risk is not rated.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Not rated no burnable land within ember reach |
|---|
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | PLAINVIEW WD public/private · serves 34,000 people · EPA ID NY2902845 |
|---|---|
| Water Source | Groundwater |
| Last State Inspection | Jun 2024 |
| Lead | Under 1 ppb (2021–2023) action level 15 ppb |
| Water Quality | Tetrachloroethylene resolved · Jul 2017 cis-1,2-Dichloroethylene resolved · Jul 2017 |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | None last 3 years |
Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.
Source: FCC Broadband Data Collection, based on 607 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Optimum Fiber · Cable | 8,000 / 8,000 |
| Verizon Fiber · Fixed Wireless in parts of the area | 2,300 / 2,300 |
| T-Mobile Fixed Wireless | 100 / 20 |
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