Property Taxes in Williamstown, New York
Median Williamstown, New York effective property tax rate: 2.19%, significantly higher than the national median of 1.02%, and higher than the New York state median of 1.90%.
Median Williamstown, New York home value: $101,563
Median annual Williamstown, New York tax bill: $2,317, $83 lower than the national median property tax bill of $2,400.
How are property taxes in Oswego calculated?
Property taxes in Williamstown, New York are calculated based on the tax assessed value, which is often lower than the actual market value due to property tax exemptions such as the homestead or senior exemption.
Understanding Williamstown's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Williamstown, knowing local tax details benefits homeowners and investors.
Last Updated April 13, 2026
How Does the Williamstown Property Tax Calculator Work?
Use this Williamstown property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Williamstown's median effective tax rate of 2.19% — based on actual property records in Oswego County — to generate your estimate.
Enter your property's estimated assessed value — the figure the local assessment office uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Williamstown's median effective rate across all local levies, providing a more accurate estimate than applying a single county millage rate.
Your bill may vary by ZIP code within Williamstown: rates range from 2.19% in 13493 to 2.19% in 13493, primarily due to differences in school district levies and local assessment districts.
For a more precise estimate, scroll down to explore ZIP code-level tax rate trends across Williamstown.
About Williamstown Property Taxes
About Property Taxes in Williamstown, Oswego, New York
Williamstown’s median effective property tax rate of 2.19% is higher than the New York state median of 1.90% and higher than the national median of 1.02%. This rate reflects the Oswego County base levy combined with local school district levies and special district levies that vary by subdivision throughout the city.
Property tax rates are not uniform across Williamstown. Homeowners in the 13493 ZIP code carry a median effective rate of 2.19%, while those in the same ZIP code also pay 2.19%. This spread — 0.00 percentage points across the same city — reflects how school district boundaries and local assessment districts are drawn across Oswego County. Understanding which part of Williamstown you live in can make a meaningful difference to your annual tax bill.
Williamstown homeowners who believe their assessed value is too high can file a formal appeal with the local Assessment Review Commission before the May 26, 2026 deadline each year.
If your estimated bill above seems higher than expected, Ownwell can review your assessment and protest on your behalf. You only pay if we save you money.
Property Tax Rates Across Williamstown, Oswego County, New York
As noted earlier, local government entities set tax rates, which can vary widely within a state.
Why? Because annually, each county estimates its required budget to provide services and divides that by the total value of all taxable property within its jurisdiction. This calculation results in the property tax rate.
While there are votes and laws involved in setting tax rates and budgets, in a nutshell, this is the annual process.
Below, you can compare Williamstown's effective property tax rate to other cities in New York and the median property tax rates in New York and the U.S.
Our median effective property tax rate (tax bill Ă· assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.
Median Effective Williamstown Tax Rate
2.19%
Our median effective property tax rate (tax bill Ă· assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.
Median Effective Oswego County Tax Rate
2.68%
Median Effective New York Tax Rate
1.90%
Median Effective United States Tax Rate
1.27%
Property Tax Rates Across Williamstown, Oswego County, New York
| Zip | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 13493 | 2.02% | 2.19% | 2.19% | 2.24% | 3.22% |
Source: Ownwell
Property Tax Assessment Values Across Williamstown, Oswego County, New York
When examining property taxes in Williamstown, New York, understanding the distinction between market value and assessed value is crucial.
The market value is what a willing buyer would pay to a willing seller in an open and competitive market, often influenced by location, property condition, and economic market trends. The Oswego County appraisal district estimates the market value for tax purposes.
The assessed value is the market value minus any applicable exemptions or limits determined by local laws and offerings. The assessed value is the figure used to calculate your property taxes, or the amount multiplied by your tax rate to get your tax bill.
Assessment notices are sent in the spring each year and typically reach your mailbox by the middle of the month. Each property owner receives a notice that includes both the market value and assessed value, along with an estimate of your property tax bill.
For example, the median home price in Williamstown is $101,563, while the median tax bill is $2,317. That is slightly below the national median property tax bill of $2,400, even as the national median property tax rate stands at 1.02%. In Williamstown, tax bills range from $1,393 at the 25th percentile to $5,033 at the 90th percentile, with ZIP code 13493 showing the highest median home price at $101,563.
Property Tax Assessment Values Across Williamstown, Oswego County, New York
Source: Ownwell
$82,273
$136,837
$191,400
Median Williamstown Market Value
$101,563
Median Oswego County Market Value
$142,286
Median New York Market Value
$312,500
Median United States Market Value
$274,101
Property Tax Assessment Values Across Williamstown, Oswego County, New York
| Zip | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 13493 | $38,965 | $59,375 | $101,563 | $156,495 | $223,870 |
Source: Ownwell
Property Tax Bills Across Williamstown, Oswego County, New York
Property tax bills in Williamstown are based on the assessed value of a home and the local tax rate set by taxing authorities in Oswego County. When a property’s assessed value rises, the tax bill can increase unless exemptions or other adjustments apply. For homeowners, this means the amount owed is tied to both the market value of the home and local budget needs.
The median home price in Williamstown is $101,563, and the median property tax bill is $2,317, which is close to the national median property tax bill of $2,400. Bills can vary widely: the 25th percentile is $1,393, while the 75th percentile is $3,547 and the 90th percentile reaches $5,033. That range shows how different assessments and tax rates can affect what homeowners pay each year.
Median Williamstown Tax Bill
$2,317
Median Oswego County Tax Bill
$4,072
Median New York Tax Bill
$5,420
Median United States Tax Bill
$3,209
Property Tax Bills Across Williamstown, Oswego County, New York
| Zip | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 13493 | $898 | $1,393 | $2,317 | $3,547 | $5,033 |
Source: Ownwell
Don't miss the deadline to file a grievance!
Dates | |
|---|---|
| Appeal Deadline | May 26 |
Links | |
|---|---|
| Oswego Assessment Review Commission | |
| Website | oswegogis.maps.arcgis.com |