Property tax in Merrimack County, New Hampshire

By Brent Chudoba, editor Updated September 23, 2026

The median property tax bill in Merrimack County, New Hampshire is $6,783 a year, which is about 1.85% of the county's median home value of $367,600. That effective rate is higher than the typical New Hampshire county (1.79%) and higher than the national median (0.81%). These are American Community Survey 5-year estimates (2024); your own bill depends on your home's assessed value and any exemptions.

Estimate the property tax on a home in Merrimack County

Enter a home's market value for a ballpark at Merrimack County's average effective rate of 1.85% (Census). The real bill depends on the home's assessed value, the millage where it sits and any exemptions.

Home market value

Estimated property tax: $6,801 / year

Property tax in Merrimack County at a glance

Merrimack County, New Hampshire property tax (Census ACS, reviewed September 23, 2026)
Measure	Value
Median annual property tax	$6,783
Median home value	$367,600
Effective tax rate	1.85%
Typical New Hampshire county rate	1.79%
National median county rate	0.81%

Effective rate = median real estate taxes paid divided by median home value. Source: U.S. Census Bureau, American Community Survey 5-year estimates.

How does Merrimack County compare in New Hampshire?

Among New Hampshire's 10 counties, Merrimack County has the 4th highest effective property-tax rate: 3 rank higher and 6 rank lower. That is on the higher side for New Hampshire. Nationally, it ranks 127th of 3135 US counties by effective rate. See every New Hampshire county ranked.

How much do homeowners in Merrimack County actually pay?

The median is only the middle bill. Across Merrimack County's 44,754 owner-occupied homes, 86.5% pay $3,000 or more a year in property tax, 91.1% pay at least $2,000, and 2.8% pay under $800. Another 1.1% report paying no property tax at all, which usually means an exemption covers the whole bill.

Annual property tax paid by Merrimack County homeowners (Census ACS 2020-2024)
Annual bill	Homes	Share
Under $800	1,268	2.8%
$800 to $1,499	1,361	3%
$1,500 to $1,999	885	2%
$2,000 to $2,999	2,041	4.6%
$3,000 or more	38,698	86.5%
No property tax paid	501	1.1%

Owners with a mortgage pay a median of $7,168 and owners without one pay $6,065. Owners who have paid off a home have usually held it longer, and in states that cap how fast an existing owner's assessment can rise, long-held homes carry lower assessed values. Census table B25103.

How does the Merrimack County property tax bill compare with local incomes?

The median property tax bill of $6,783 is about 5.8% of the median income of Merrimack County homeowner households, $116,283 a year. That compares two middles, so a retiree in a long-held home can pay a far larger share. 73.5% of Merrimack County's occupied homes are lived in by their owners; renters pay property tax too, just folded into rent.

Have property taxes gone up in Merrimack County?

Yes. The median bill went from $5,736 in 2015-2019 to $6,783 in 2020-2024, a 18.3% rise. Over the same span the median home value moved 54.7%, from $237,600 to $367,600. Bills rose more slowly than values, which is what assessment caps and falling millage rates do: the county is taxing a smaller share of each home's worth.

Two Census ACS 5-year periods with no survey years in common, in each period's own dollars. A change counts only if it exceeds the combined 90% margin of error.

Property tax in counties next to Merrimack County

Merrimack County borders 6 counties.

Merrimack County and its neighbors, highest effective rate first (Census ACS 2020-2024)
County	Effective rate	Median bill	Median home value
Sullivan County, NH	2.14%	$5,756	$268,700
Strafford County, NH	1.85%	$6,708	$362,800
Merrimack County, NH (this county)	1.85%	$6,783	$367,600
Grafton County, NH	1.72%	$5,925	$344,500
Hillsborough County, NH	1.66%	$6,999	$421,100
Rockingham County, NH	1.58%	$7,839	$497,500
Belknap County, NH	1.31%	$4,924	$374,900

How is a home assessed in Merrimack County?

New Hampshire sets the assessment rules and Merrimack County applies them. How New Hampshire assesses and reappraises homes.

Is there a homestead exemption in Merrimack County?

No. New Hampshire has no across-the-board homestead exemption; its exemptions target specific groups, and most are local options your town must vote to offer. That is the New Hampshire rule, and it applies in Merrimack County. New Hampshire's exemptions and relief programs in full.

When are property taxes due in Merrimack County?

There is no single statewide due date, because the billing schedule is a local choice. Under the default in state law a town sends one annual bill and interest starts December 1. Most municipalities have instead voted to bill twice a year, with a July 1 payment computed from half the prior year's rate and the balance due December 1. A smaller group running a July to June fiscal year bills quarterly, due July 1, October 1, January 2 and March 31, so check your own tax collector.

That is the New Hampshire rule. Merrimack County issues and collects the bill, so the dates printed on your statement are the ones that bind you.

How to appeal your Merrimack County property assessment

You contest the assessed value with the your local selectmen or assessors, then either the Board of Tax and Land Appeals or the county superior court. The filing deadline is typically March 1 following the notice of tax to apply to the town, then September 1 to appeal further. That is the New Hampshire rule; Merrimack County sets the exact dates and forms. The New Hampshire appeal process step by step.

New Hampshire rules from primary state sources, reviewed September 7, 2026; sources on the New Hampshire page.

Work out your own numbers

Sources

Median real estate taxes paid and median home value for Merrimack County, New Hampshire: U.S. Census Bureau, American Community Survey 5-year estimates (2020-2024), tables B25103, B25077, B25102, B25119 and B25003; the five-year comparison uses the 2015-2019 estimates. Neighboring counties: Census county adjacency file.