Ranking of New Hampshire Counties By Population in 2020
Updated on June 18, 2025.
Based on the US Census Vintage data estimates, in 2020, the Population for New Hampshire was 1.38M. Among all New Hampshire counties, Hillsborough County had the highest population (422.93K), followed by Rockingham County (314.66K), and Merrimack County (154.04K).
The chart below shows the top 10 counties, and the table below shows the ranking of all New Hampshire counties.
You can see similar ranking information for related topics, and for other states. You can also see the ranking of all counties in the United States.
Related Topics: New Hampshire Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage), 2020 Census.
See this for other years:
Ranking of New Hampshire Counties By Population in 2020
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| Rank | County | Population |
|---|---|---|
| 1 | Hillsborough County | 422929 |
| 2 | Rockingham County | 314664 |
| 3 | Merrimack County | 154039 |
| 4 | Strafford County | 131074 |
| 5 | Grafton County | 91197 |
| 6 | Cheshire County | 76542 |
| 7 | Belknap County | 63774 |
| 8 | Carroll County | 50240 |
| 9 | Sullivan County | 43069 |
| 10 | Coos County | 31228 |