Data / Population density / Merrimack County

Population density in Merrimack County

Population density in Merrimack County was 65.4 inhabitants per km² in 2025, according to the U.S. Census Bureau. That is up 0.3% from 2024. That is the 4th highest of 10 counties in 2025.

2025, inhabitants per km²65.4
Change on 2024+0.3%
Rank4th of 10Counties in New Hampshire ranked
Series high65.42025
Series low63.82020

Population density in Merrimack County, 2020 to 2025

CSVChart (SVG)

63.56464.56565.52020202120222023202420252020: 63.8 inhabitants per km²2021: 64 inhabitants per km²2022: 64.7 inhabitants per km²2023: 64.9 inhabitants per km²2024: 65.2 inhabitants per km²2025: 65.4 inhabitants per km²
inhabitants per km². Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09, published 2026-03-26.
All 6 values
Periodinhabitants per km²
202565.4
202465.2
202364.9
202264.7
202164
202063.8

Compared with New Hampshire and United States

Place2025
Merrimack County65.4
New Hampshire61
United States37.3

Rankings

Definition

Resident population divided by land area in km². World Bank figures use mid-year population and land area excluding inland water.

United States: Census Bureau population estimates for 1 July divided by land area (water excluded) from the latest Census Gazetteer files. US tables often give people per square mile; multiply persons per km² by 2.59 to compare.

How to cite

U.S. Census Bureau. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-09.

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Questions

What is the population density in Merrimack County?

Population density in Merrimack County was 65.4 inhabitants per km² in 2025, according to the U.S. Census Bureau. That is up 0.3% from 2024. That is the 4th highest of 10 counties in 2025.

Where does this figure come from?

U.S. Census Bureau. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². Retrieved by Invokely on 2026-10-09.

What was the highest population density in Merrimack County?

65.4 inhabitants per km² in 2025, the highest value since 2020 in this series.

More statistics for Merrimack County

All statistics for Merrimack County