Nassau County, N.Y.
Old Westbury property taxes and assessments
What the 2028 tentative roll shows for 1,002 one-to-three family homes in Old Westbury, North Hempstead, and how to check your own record before the filing window.
- Median County market value
- $1,680,500Half of residential parcels are valued above this, half below
- Median assessed value
- $1,681Total assessed value on the roll
- Median assessment ratio
- 0.1%Assessed value as a share of County market value
- Residential parcels
- 1,002Of 1,083 parcels on the roll in this area
How values are spread across Old Westbury
The range shows how far the County’s figures stretch across the area’s one-to-three family homes. A quarter of parcels sit below the 25th percentile and a quarter above the 75th. A home near the top of the range is not over-assessed because of that alone; it may simply be larger, newer, or on more land.
| Figure | Lowest | 25th percentile | Median | 75th percentile | Highest |
|---|---|---|---|---|---|
| County market value | $0 | $1,211,250 | $1,680,500 | $2,265,000 | $20,051,000 |
| Total assessed value | $0 | $1,211 | $1,681 | $2,265 | $20,051 |
What these figures mean, and what they don’t
- A median is not your value. It marks the middle of 1,002 homes that differ in size, age, condition, and lot. Your own record may be well above or below it for good reasons.
- Assessed value is a fraction of market value. Nassau assesses one-to-three family homes at a small percentage of County market value; the median ratio above is that percentage. Two homes with the same market value should carry the same assessed value.
- The roll is tentative. A tentative roll is the County’s first published figure for the year. Values can change through corrections and appeals before the roll becomes final, and these summaries will be refreshed when a newer roll is imported.
- Verify with the County. Check any figure that matters to you in the Nassau County Land Records Viewer before relying on it. This page summarizes published records; it is not an appraisal.
When to file
The published ARC filing window is January 4–March 1, 2027. Confirm the dates on Nassau County’s appeal instructions before filing. The County states that a grievance never raises an assessment; our deadline guide walks through what to prepare.
See your County record
and nearby sales context.
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Old Westbury property tax questions
What is the median home value in Old Westbury?
The Nassau County 2028 tentative roll puts the median County market value of the 1,002 one-to-three family homes in Old Westbury at $1,680,500. Half of them are valued between $1,211,250 and $2,265,000.
How are homes in Old Westbury assessed?
Nassau assesses one-to-three family homes at a fraction of County market value. In Old Westbury, the median assessed value is $1,681 and the median assessment ratio is 0.1% of market value.
When can Old Westbury homeowners file a grievance?
The published Nassau County ARC filing window is January 4–March 1, 2027. The County states that a grievance never raises an assessment.
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Keep reading
Understanding your Nassau County assessment
Make sense of market value, assessed value, and tax bills before comparing your home with nearby properties.
Choosing comparable sales
Which nearby sales support an appeal, which differences matter, and why a neighbor’s lower bill is not evidence.
Nassau County tax grievance deadline
The published 2027 filing window, a preparation checklist, and where to confirm current instructions.