Grantham, Grafton County, New Hampshire Property Taxes
Property Taxes in Grantham, New Hampshire
Median Grantham, New Hampshire effective property tax rate: 1.69%, significantly higher than the national median of 1.02%, and lower than the New Hampshire state median of 1.82%.
Median Grantham, New Hampshire home value: $656,950
Median annual Grantham, New Hampshire tax bill: $11,109, $8,709 higher than the national median property tax bill of $2,400.
How are property taxes in Grafton calculated?
Property taxes in Grantham, New Hampshire 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 Grantham's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Grantham, knowing local tax details benefits homeowners and investors.
Last Updated April 13, 2026
Grantham, Grafton County, New Hampshire Property Tax Bill Calculator
$100,000
$1,500,000
$3,000,000
Median Effective Tax Rate
1.69%
Estimate Property Tax Bill
$11,102
$10,303
How Does the Grantham Property Tax Calculator Work?
Use this Grantham property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Grantham's median effective tax rate of 1.69% — based on actual property records in Grafton County — to generate your estimate.
Enter your property's estimated assessed value — the figure the local assessment process uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Grantham'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 Grantham: rates range across local taxing areas, primarily due to differences in school district levies and local assessment districts. Compared with the 1.82% state median tax rate, Grantham's rate is lower, but the median tax bill of $11,109 is still well above the national median property tax rate of 1.02% and national median property tax bill of $2,400.
For a more precise estimate, scroll down to explore ZIP code-level tax rate trends across Grantham.
About Grantham Property Taxes
About Property Taxes in Grantham, Grafton, New Hampshire
Grantham's median effective property tax rate of 1.69% is lower than the New Hampshire state median of 1.82% and higher than the national median of 1.02%. This rate reflects the Grafton County base levy combined with local school district levies and special assessment districts that vary by subdivision throughout the city.
Property tax rates are not uniform across Grantham. Homeowners in the highest ZIP code carry a median effective rate of 1.69%, while those in the lowest pay 1.69%. This spread — 0 percentage points across the same city — reflects how school district boundaries and local assessment districts are drawn across Grafton County. Understanding which part of Grantham you live in can make a meaningful difference to your annual tax bill.
Grantham homeowners who believe their assessed value is too high can file a formal appeal with the Tax Assessor before September 1, 2026.
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 Grantham, Grafton County, New Hampshire
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 Grantham's effective property tax rate to other cities in New Hampshire and the median property tax rates in New Hampshire and the U.S.
Our median effective property tax rate (tax bill ÷ 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 Grantham Tax Rate
1.69%
Our median effective property tax rate (tax bill ÷ 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 Grafton County Tax Rate
1.93%
Median Effective New Hampshire Tax Rate
1.82%
Median Effective United States Tax Rate
1.02%
Property Tax Rates Across Grantham, Grafton County, New Hampshire
| Zip | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 03753 | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
Property Tax Assessment Values Across Grantham, Grafton County, New Hampshire
When examining property taxes in Grantham, New Hampshire, 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 Grafton 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 tax 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:
In Grafton County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of the month when notices are sent.
Each property owner receives an assessment notice that contains both the market value and assessed value, along with an estimate of your property tax bill. By providing insights into how assessed and market values are determined, this section helps property owners navigate their tax responsibilities and understand the valuation processes affecting their property taxes in Grantham.
For example, the median home price in Grantham is $656,950, with tax bills ranging significantly across the county. Grantham’s median tax bill is $11,109, well above the national median property tax bill of $2,400.
Property Tax Assessment Values Across Grantham, Grafton County, New Hampshire
Source: Ownwell
$95,550
$384,725
$673,900
Median Grantham Market Value
$656,950
Median Grafton County Market Value
$281,200
Median New Hampshire Market Value
$360,500
Median United States Market Value
$235,294
Property Tax Assessment Values Across Grantham, Grafton County, New Hampshire
| Zip | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 03753 | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
Property Tax Bills Across Grantham, Grafton County, New Hampshire
How Are Property Tax Bills Calculated in Grantham?
Property tax bills in Grantham are based on the assessed value of a home and the local tax rate set for Grafton. When a property’s assessed value rises, the tax bill can increase as well, even if the homeowner has not made any changes to the home. Local officials use the assessed market value to determine how much tax is owed, and that amount is then multiplied by the applicable tax rate.
For homeowners, this means the tax bill is closely tied to home value and local assessments. With a median home price of $656,950, property taxes can be a major part of annual housing costs. The 25th percentile tax bill is $6,971, the 75th percentile is $14,665, and the 90th percentile is $14,946. Compared with the national median property tax bill of $2,400, Grantham homeowners often face much higher bills, making assessment accuracy especially important.
Median Grantham Tax Bill
$11,109
Median Grafton County Tax Bill
$5,056
Median New Hampshire Tax Bill
$6,530
Median United States Tax Bill
$2,400
Property Tax Bills Across Grantham, Grafton County, New Hampshire
| Zip | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 03753 | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
Don't miss the deadline to appeal!
Dates | |
|---|---|
| Appeal Deadline | March 1 |
Links | |
|---|---|
| Grafton Tax Assessor | |
| Website | www.vgsi.com |