Merrimack County, New Hampshire Demographics 2026

Population Overview

Merrimack County is located in New Hampshire with a total population of 155,018. It is the 3rd most populous county out of 10 in New Hampshire. The county encompasses 2 Census-designated places.

Age Demographics

The median age in Merrimack County is 42.6 years. This is 1% lower than the state median of 43.2 years.

Economy, Income & Housing

The median household income in Merrimack County is $93,944. This is 2% lower than the state median of $95,628. Compared to the national median of $78,538, household income here is 20% higher. The poverty rate stands at 7.1%. This is about average than the state poverty rate of 7.2%. The unemployment rate is 3.1%. This is 8% lower than the state rate of 3.4%. The median home value is $330,600. Housing costs are 10% lower than the state median of $367,200. The home-value-to-income ratio is 3.5x. 73.5% of occupied housing units are owner-occupied. This homeownership rate is 1% higher than the state average of 72.5%.

Race & Ethnicity

Merrimack County has a predominantly White (non-Hispanic) population, comprising 90.6% of all residents. Hispanic or Latino residents account for 2.6%.

Education

38.1% of residents aged 25 and older hold a bachelor's degree or higher. This is 4% lower than the state rate of 39.8%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 93.7%. Notably, 15.9% of adults hold a graduate or professional degree, indicating a highly educated workforce.