Merrimack County, NH Property Tax: $6,617/yr (2026)
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The effective property tax rate in Merrimack County is 2.00% of assessed home value. On a home at the county median value of $330,600, that works out to about $6,612 per year, or $551 per month. Merrimack County is located in central New Hampshire, and is home to approximately 155,018 residents.
About Merrimack County
Merrimack County covers approximately 932.9 square miles in New Hampshire. The county is home to about 155,018 residents living in roughly 66,080 housing units, of which 67.2% are owner-occupied. The median household income is $93,944, and the median home was built in 1977.
Merrimack County borders Belknap County, Grafton County, Hillsborough County, Rockingham County, Strafford 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 Merrimack County Assessor's office to learn which exemptions apply to your property and when to file.
Merrimack County vs. Neighboring Counties
| Location | Eff. Rate | Median Home | Annual Tax |
|---|---|---|---|
| Merrimack County, NH | 2.00% | $330,600 | $6,612 |
| New Hampshire state average | 1.85% | — | $6,116* |
| Belknap County | 1.44% | $340,000 | $4,897 |
| Grafton County | 1.88% | $298,500 | $5,624 |
| Hillsborough County | 1.76% | $385,500 | $6,791 |
| Rockingham County | 1.63% | $461,400 | $7,512 |
| Strafford County | 1.98% | $332,400 | $6,582 |
| US national average | 1.10% | $281,900 | $3,101 |
*State average annual tax computed at Merrimack County's median home value of $330,600. Source: US Census ACS 2023 5-year estimates.
Frequently Asked Questions
How does Merrimack County's property tax rate compare to the rest of New Hampshire?
At 2.00%, Merrimack County is higher than the New Hampshire state average of 1.85%. On a home at the county median of $330,600, that means about $6,612 per year — versus $6,116 at the state average rate, a difference of $496 per year. Compared to the national average of 1.10%, Merrimack County is above average.
What's a typical annual property tax bill in Merrimack County?
For a home at the county median value of $330,600, the annual property tax in Merrimack County is approximately $6,612 — or about $551 per month. For a home worth $495,900, expect around $9,918 per year. For a $661,200 home, approximately $13,224 per year. Use the calculator above to estimate taxes for any assessed value.
Where do I appeal a Merrimack County property tax assessment?
Property assessment appeals in Merrimack County are handled by the Merrimack County Assessor's office. 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 Merrimack 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 2.00% shown here. Contact the Merrimack 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