How many people live in Rockingham County, NH?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 322,400 people living in Rockingham County, NH. That makes Rockingham County the second-most populous county in New Hampshire. It is home to 22.8% of people living in the state.
322K
population of Rockingham County, NH (2024)
22.8%
County share of the New Hampshire population (2024)
About 322,400 people lived in Rockingham County, NH in 2024.
Population estimates, 2000–2024
What are Rockingham County, NH’s age demographics?
About 71,200 Rockingham County, NH residents are aged 65 and older in 2024. That represents 22.1% of its population. For comparison, the age group represents 21.5% of New Hampshire’s population and 18% in the US overall.
Another 57,700 Rockingham County residents, or 17.9% 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 Rockingham County, NH's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Rockingham County, NH’s racial and ethnic demographics?
Non-Hispanic white residents make up 91% of the Rockingham County, NH population, higher than the national share of 57.5%.
In contrast, Rockingham County’s Hispanic population accounts for 4%, 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.
Rockingham 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 Rockingham County, NH is Derry with about 34,100 residents in 2024.
Cities and towns in Rockingham County, NH ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Derry | 34,062 |
| 2. | Salem | 31,673 |
| 3. | Londonderry | 27,101 |
| 4. | Portsmouth | 22,938 |
| 5. | Hampton | 16,448 |
| 6. | Windham | 16,208 |
| 7. | Exeter | 16,205 |
| 8. | Raymond | 11,012 |
| 9. | Newmarket | 9,528 |
| 10. | Hampstead | 9,156 |
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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.
