Coos County, New Hampshire

Coos County population, land area and income

Coos County had 31,094 residents in the Census Vintage 2024 estimate, on 1,794.6 square miles of land. It is the largest by land of New Hampshire's 10 county-equivalents. That works out to 17.3 people per square mile, below the US average of 96.3, and below the national county median.

The median county-equivalent in New Hampshire has 85,562 residents, so Coos County has 36% of the typical county's population.

Its SAIPE 2023 median household income of $59,592 is below the national county median among 3,143 counties with an estimate.

How Coos County's population changed since 2020

Coos County lost 134 residents between the July 2020 and July 2024 estimates, a drop of 0.4%. That ranks 10th of 10 in New Hampshire for growth. The median New Hampshire county changed by +2.3%, and the state as a whole by +2.2%.

Since the April 2020 estimates base, Coos County recorded 944 births and 2,328 deaths, a natural change of -1,384. Net international migration added +78 and net domestic migration, people moving to or from other US counties, came to +1,137. The largest single component was natural change, which removed 1,384 people.

Where Coos County is

The Census internal point of Coos County is at 44.652500, -71.289400. It sits in UTM zone 19N. The map shades New Hampshire's 10 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Coos County outlined. Dots are towns of 1,000+ people with residents in it.

Towns in Coos County

One incorporated place of 1,000+ people has residents in Coos County, 9,248 people together, or 30% of the county. Each figure counts only the part of the town inside Coos County; towns marked "part" extend into another county. The largest is Berlin with 9,248.

Counties bordering Coos County

The Census 2024 county adjacency file lists 4 neighbors for Coos County, including 2 across a state line. The most populous is Grafton County, NH, with 93,045 residents. Distances run between Census internal points in a straight line.

• Grafton County

  93,045 people

  57 mi SSW

• ME

  Oxford County, ME

  60,039 people

  29 mi ESE

• Carroll County

  52,580 people

  54 mi S

• VT

  Essex County, VT

  6,037 people

  22 mi WNW

Distance to Concord and the nearest big city

Concord is 100.6 miles S of Coos County's internal point in a straight line. The nearest place of 100,000 or more is Manchester, NH (population 116,386), 115.5 miles away. The nearest place of 10,000 or more is Auburn, ME (population 25,200), 64.6 miles away.

Coos County FIPS code

The FIPS code of Coos County is 33007: state code 33 for New Hampshire plus county code 007. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $59,592.