How many people live in Coos County, NH?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 31,100 people living in Coos County, NH. That makes Coos County the 10th-most populous county in New Hampshire. It is home to 2.2% of people living in the state.
31.1K
population of Coos County, NH (2024)
2.2%
County share of the New Hampshire population (2024)
About 31,100 people lived in Coos County, NH in 2024.
Population estimates, 2000–2024
What are Coos County, NH’s age demographics?
About 8,400 Coos County residents are aged 65 and older in 2024. That represents 27.1% of its population. For comparison, the age group represents 21.5% of New Hampshire’s population and 18% in the US overall.
Another 5,000 Coos County residents, or 15.9% of the population, were children under 18. For comparison, the age group represents 17.7% of New Hampshire’s population and 21.6% in the US overall.
A higher share of Coos County, NH's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Coos County, NH’s racial and ethnic demographics?
Non-Hispanic white residents make up 93.9% of the Coos County, NH population, higher than the national share of 57.5%.
In contrast, Coos County’s Hispanic population accounts for 2.6%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 0.92% of the county, compared with 12.6% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Coos County, NH has a higher share of a non-Hispanic white population than New Hampshire as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Coos County, NH is Berlin with about 9,200 residents in 2024.
Cities and towns in Coos County, NH ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Berlin | 9,248 |
| 2. | Lancaster | 3,212 |
| 3. | Gorham | 2,673 |
| 4. | Whitefield | 2,528 |
| 5. | Northumberland | 2,107 |
| 6. | Colebrook | 2,100 |
| 7. | Milan | 1,359 |
| 8. | Jefferson | 1,060 |
| 9. | Dalton | 912 |
| 10. | Carroll | 839 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
