Coos County, NH Property Tax: $3,511/yr (2026)
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The effective property tax rate in Coos County is 2.07% of assessed home value. On a home at the county median value of $169,600, that works out to about $3,511 per year, or $293 per month. Coos County is located in northern New Hampshire, with Lancaster as its county seat, and is home to approximately 31,386 residents.
About Coos County
Coos County covers approximately 1,794.6 square miles in New Hampshire. The county is home to about 31,386 residents living in roughly 20,589 housing units, of which 49.7% are owner-occupied. The median household income is $58,439, and the median home was built in 1969.
The county seat is Lancaster. Coos County borders Oxford County, Carroll County, Grafton County, Essex County — useful comparisons if you're considering nearby areas with potentially different tax rates.
How Property Taxes Work in New Hampshire
Property taxes in New Hampshire are administered at the county level. Each county sets a millage rate applied to the assessed value of real property — the effective rate above accounts for any partial assessments and exemptions already built into the local tax base. Assessed value can differ meaningfully from current market value depending on how often the county reassesses and what fraction of market value it uses.
Most counties in New Hampshire offer exemptions that reduce the taxable assessed value: homestead exemptions for primary residences, senior exemptions, disability exemptions, and veteran exemptions are common. These reduce your effective rate below the county-wide average shown here. Contact the Coos County Assessor's office to learn which exemptions apply to your property and when to file.
Coos County vs. Neighboring Counties
| Location | Eff. Rate | Median Home | Annual Tax |
|---|---|---|---|
| Coos County, NH | 2.07% | $169,600 | $3,511 |
| New Hampshire state average | 1.85% | — | $3,138* |
| Oxford County | 1.09% | $192,300 | $2,103 |
| Carroll County | 1.06% | $348,900 | $3,685 |
| Grafton County | 1.88% | $298,500 | $5,624 |
| Essex County | 1.69% | $167,500 | $2,828 |
| US national average | 1.10% | $281,900 | $3,101 |
*State average annual tax computed at Coos County's median home value of $169,600. Source: US Census ACS 2023 5-year estimates.
Frequently Asked Questions
How does Coos County's property tax rate compare to the rest of New Hampshire?
At 2.07%, Coos County is higher than the New Hampshire state average of 1.85%. On a home at the county median of $169,600, that means about $3,511 per year — versus $3,138 at the state average rate, a difference of $373 per year. Compared to the national average of 1.10%, Coos County is above average.
What's a typical annual property tax bill in Coos County?
For a home at the county median value of $169,600, the annual property tax in Coos County is approximately $3,511 — or about $293 per month. For a home worth $254,400, expect around $5,266 per year. For a $339,200 home, approximately $7,021 per year. Use the calculator above to estimate taxes for any assessed value.
Where do I appeal a Coos County property tax assessment?
Property assessment appeals in Coos County are handled by the Coos County Assessor's office in Lancaster. Most jurisdictions require filing within 30–90 days of receiving your assessment notice — confirm the specific deadline with the assessor's office before submitting, as deadlines and procedures vary by county. A successful appeal can reduce your assessed value and lower your tax bill for the current and future tax years.
What exemptions are available in Coos County?
New Hampshire counties commonly offer homestead exemptions for owner-occupied primary residences, senior citizen exemptions for qualifying homeowners aged 65 and older, exemptions for disabled residents, and veterans' exemptions. Each exemption reduces your assessed taxable value, which in turn reduces your effective tax rate below the county-wide 2.07% shown here. Contact the Coos County Assessor's office to confirm which exemptions are available and the application deadlines.
Data sources: US Census Bureau ACS 2023 5-Year Estimates, US Census Gazetteer (2024), County Adjacency File